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Physics: HL Revision Notes

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AQA A Level Chemistry

Revision Notes

Home / A Level / Chemistry / AQA / Revision Notes / 5. Advanced Physical Chemistry (A Level only) / 5.1 Thermodynamics (A Level only) / 5.1.1 Thermodynamic Terms


5.1.1 Thermodynamic Terms


Defining Thermodynamic Terms

  • Thermodynamics literally means heat and movement and is the branch of physical chemistry that deals with heat, energy, temperature and the physical properties of matter
  • Energy cycles are special representations of enthalpy changes for ionic compounds using the principles of Hess's Law
  • In order to understand how energy cycles work you need a good knowledge of some key enthalpy change definitions
  • Enthalpy change (ΔH) refers to the amount of heat energy transferred during a chemical reaction, at a constant pressure
  • The definitions you need to know are:
    • enthalpy of formation
    • ionisation enthalpy
    • enthalpy of atomisation
    • bond enthalpy
    • electron affinity

Enthalpy of formation

  • The enthalpy of formation (ΔHfꝋ) is the enthalpy change when 1 mole of a compound is formed from its elements under standard conditions
    • Standard conditions in this syllabus are a temperature of 298 K and a pressure of 100 kPa

  • The ΔHfꝋ can be endothermic or exothermic as the energy change is the sum of the bonds broken and formed, so the enthalpy change can have positive or negative values
  • Equations can be written to show the standard enthalpy change of formation (ΔHfꝋ) for compounds
  • For example, the enthalpy of formation sodium chloride is shown as:

Na(s) + ½Cl2 (g) → NaCl (s)            ΔHfꝋ = -411 kJ mol -1

  • Notice that enthalpy of formation only refers to compounds
    • By definition the enthalpy of formation of elements is zero

Ionisation enthalpy

  • The ionisation enthalpy (ΔHieꝋ) of an element is the amount of energy required to remove an electron from a gaseous atom of an element to form a gaseous ion under standard conditions
  • Ionisation enthalpy is always endothermic as energy is need to overcome the attraction between an electron and the nucleus
  • The first ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions
    • E.g. the first ionisation energy of gaseous sodium:

Na (g) → Na+ (g) + e–          ΔHieꝋ = +500 kJ mol-1

Enthalpy change of atomisation

  • The standard enthalpy change of atomisation (ΔHatꝋ) is the enthalpy change when 1 mole of gaseous atoms is formed from its element under standard conditions
  • The ΔHatꝋ is always endothermic as energy is always required to break any bonds between the atoms in the element, to break the element into its gaseous atoms
    • Since this is always an endothermic process, the enthalpy change will always have a positive value

  • Equations can be written to show the standard enthalpy change of atomisation (ΔHatꝋ) for elements
  • For example, sodium in its elemental form is a solid
  • The standard enthalpy change of atomisation for sodium is the energy required to form 1 mole of gaseous sodium atoms:

Na (s) → Na (g)           ΔHatꝋ = +108 kJ mol -1

Worked Example

Writing equations for the standard enthalpy change of atomisationWrite down the equations for the standard enthalpy change of atomisation (ΔHatꝋ) for:

(i) Potassium

(ii) Mercury

Answer

Answer 1: Potassium in its elemental form is a solid, therefore the standard enthalpy change of atomisation is the energy required to form 1 mole of K(g) from K(s)

K(s) → K(g) 

Answer 2: Mercury in its elemental form is a liquid, so the standard enthalpy change of atomisation of mercury is the energy required to form 1 mole of Hg(g) from Hg(l)

Hg(l) → Hg(g)

Bond enthalpy

  • The amount of energy required to break one mole of a specific covalent bond in the gas phase is called the bond dissociation energy
    • Bond dissociation energy (E) is usually just simplified to bond energy or bond enthalpy

  • In symbols, the type of bond broken is written in brackets after E
    • Eg. E (H-H) is the bond energy of a mole of single bonds between two hydrogen atoms

  • Bond enthalpy is usually treated as a bond breaking process, so it is quoted in data tables as an endothermic energy change with positive values
    • For bond forming processes simply put a negative sign in front of the value

  • Equations can be written to show the bond enthalpy
  • For example, chlorine in its elemental form is a gas
  • The bond enthalpy of chlorine is shown as

Cl2 (g) → 2Cl (g)    E(Cl-Cl) = +242 kJ mol -1

  • Notice this looks very similar to atomisation enthalpy for chlorine
  • However, atomisation enthalpy, by definition, produces 1 mole of atoms, whereas bond enthalpy is expressed per mole of bonds
  • So the atomisation enthalpy of chlorine would be half the bond enthalpy

½Cl2 (g) → Cl (g)    ΔHatꝋ = +121 kJ mol -1

  • If the element was a liquid, instead of a gas, then atomisation enthalpy would also include vaporisation enthalpy - a change of state, before the bonds are broken

Lattice energy

  • As with bond enthalpy, lattice enthalpy (ΔHlattꝋ) can be expressed as a formation or dissociation process
  • As a formation process, it is the enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions (under standard conditions)
  • The ΔHlattꝋ is therefore exothermic, as when ions are combined to form an ionic solid lattice there is an extremely large release of energy
    • Since this is an exothermic process, the enthalpy change will have a negative value
    • Because of the huge release in energy when the gaseous ions combine, the value will be a very large negative value

  • The large negative value of ΔHlattꝋ suggests that the ionic compound is much more stable than its gaseous ions
    • This is due to the strong electrostatic forces of attraction between the oppositely charged ions in the solid lattice
    • Since there are no electrostatic forces of attraction between the ions in the gas phase, the gaseous ions are less stable than the ions in the ionic lattice
    • The more exothermic the value is, the stronger the ionic bonds within the lattice are

  • The ΔHlattꝋ of an ionic compound cannot be determined directly by one single experiment
  • Multiple experimental values and an energy cycle are used to find the ΔHlattꝋ of ionic compounds
  • The lattice energy (ΔHlattꝋ) of an ionic compound can be written as an equation
    • For example, sodium chloride is an ionic compound formed from sodium (Na+) and chloride (Cl-) ions
    • Since the lattice energy is the enthalpy change when 1 mole of sodium chloride is formed from gaseous sodium and chloride ions, the equation for this process is:

Na+(g) + Cl-(g) → NaCl (s)  ΔHlattꝋ = -776 kJ mol -1

Worked Example

Writing equations for lattice energyWrite down the equations which represent the lattice energy of:

(i) Magnesium oxide

(ii) Lithium chloride

Answer

Answer 1: Mg2+ (g) + O2- (g) → MgO (s)

Answer 2: Li+ (g) + Cl- (g) → LiCl (s)

Electron Affinity

  • The electron affinity (ΔHeaꝋ) of an element is the energy change when one mole of electrons is gained by one mole of gaseous atoms of an element to form one mole of gaseous ions under standard conditions
  • For example, the first electron affinity of chlorine is:

Cl (g)+ e– → Cl- (g)          ΔHeaꝋ = -364 kJ mol-1

  • The first electron affinity is always exothermic as energy is released when electrons are attracted to the atoms
  • However, the second electron affinity of an element can be endothermic as illustrated by oxygen:

O– (g) + e– → O2- (g)          ΔHeaꝋ = +844 kJ mol-1

  • This is because a large force of repulsion must be overcome between the negatively charged ion and the second electron requiring a large input of energy

Exam Tip

Make sure the correct state symbols are stated when writing these equations – it is crucial that you use these correctly throughout this entire topic.



  • 1. Physical Chemistry
    • 1.1 Atomic Structure
      • 1.1.1 Fundamental Particles
        • 1.1.2 Mass Number & Isotopes
          • 1.1.3 Time of Flight Mass Spectrometry
            • 1.1.4 Shells and Orbitals
              • 1.1.5 Electron Configuration
                • 1.1.6 Ionisation Energy
                  • 1.1.7 Ionisation Energy: Trends & Evidence
                  • 1.2 Formulae, Equations & Calculations
                    • 1.2.1 Relative Atomic Mass & Relative Molecular Mass
                      • 1.2.2 Empirical & Molecular Formula
                        • 1.2.3 Balanced Equations
                          • 1.2.4 Reaction Yields
                            • 1.2.5 Atom Economy
                              • 1.2.6 Hydrated Salts
                              • 1.3 The Mole, Avogadro & The Ideal Gas Equation
                                • 1.3.1 The Mole & the Avogadro Constant
                                  • 1.3.2 Reacting Masses
                                    • 1.3.3 Reacting Volumes
                                      • 1.3.4 The Ideal Gas Equation
                                      • 1.4 Types of Bonding & Properties
                                        • 1.4.1 Changes in State: Energy Changes
                                          • 1.4.2 Ionic Bonding
                                            • 1.4.3 Covalent Bonding
                                              • 1.4.4 Dative Covalent Bonding
                                                • 1.4.5 Dot & Cross Diagrams
                                                  • 1.4.6 Metallic Bonding
                                                    • 1.4.7 Properties of Ionic Compounds
                                                      • 1.4.8 Properties of Covalent Substances
                                                        • 1.4.9 Properties of Metallic Substances
                                                          • 1.4.10 Effects of Structure & Bonding
                                                          • 1.5 Molecules: Shapes & Forces
                                                            • 1.5.1 Shapes of Simple Molecules & Ions
                                                              • 1.5.2 Bond Polarity
                                                                • 1.5.3 Types of Forces Between Molecules
                                                                  • 1.5.4 Effects of Forces Between Molecules
                                                                  • 1.6 Energetics
                                                                    • 1.6.1 Bond Energy
                                                                      • 1.6.2 Energy Level Diagrams
                                                                        • 1.6.3 Enthalpy Changes
                                                                          • 1.6.4 Calorimetry
                                                                            • 1.6.5 Hess' Law
                                                                              • 1.6.6 Applications of Hess’s Law
                                                                                • 1.6.7 Bond Enthalpies
                                                                                • 1.7 Kinetics
                                                                                  • 1.7.1 Collision Theory
                                                                                    • 1.7.2 Measuring Rates of Reaction
                                                                                      • 1.7.3 Maxwell–Boltzmann Distributions
                                                                                        • 1.7.4 Effect of Temperature on Reaction Rate
                                                                                          • 1.7.5 Effect of Concentration & Pressure
                                                                                            • 1.7.6 Catalysts
                                                                                            • 1.8 Chemical Equilibria, Le Chatelier's Principle & Kc
                                                                                              • 1.8.1 Chemical Equilibria
                                                                                                • 1.8.2 Le Chatelier's principle
                                                                                                  • 1.8.3 The Equilibrium Constant, Kc
                                                                                                    • 1.8.4 Calculations Involving the Equilibrium Constant
                                                                                                      • 1.8.5 Changes Which Affect the Equilibrium
                                                                                                      • 1.9 Oxidation, Reduction & Redox Equations
                                                                                                        • 1.9.1 Oxidation & Reduction
                                                                                                          • 1.9.2 Oxidation States: The Rules
                                                                                                            • 1.9.3 Redox Equations
                                                                                                          • 2. Inorganic Chemistry
                                                                                                            • 2.1 Periodicity
                                                                                                              • 2.1.1 Classification of an Element
                                                                                                                • 2.1.2 Trends of Period 3 Elements: Atomic Radius
                                                                                                                  • 2.1.3 Trends of Period 3 Elements: First Ionisation Energy
                                                                                                                    • 2.1.4 Trends of Period 3 Elements: Melting Point
                                                                                                                    • 2.2 Group 2, the Alkaline Earth Metals
                                                                                                                      • 2.2.1 Trends in Group 2: The Alkaline Earth Metals
                                                                                                                        • 2.2.2 Solubility of Group 2 Compounds: Hydroxides & Sulfates
                                                                                                                          • 2.2.3 Reactions of Group 2
                                                                                                                            • 2.2.4 Uses of Group 2 Elements
                                                                                                                            • 2.3 Group 7 (17), the Halogens
                                                                                                                              • 2.3.1 Physical Properties of Group 7
                                                                                                                                • 2.3.2 Chemical Properties of Group 7
                                                                                                                                  • 2.3.3 Testing for Halide Ions
                                                                                                                                    • 2.3.4 Uses & Reactions of Chlorine
                                                                                                                                  • 3. Organic Chemistry
                                                                                                                                    • 3.1 Introduction to Organic Chemistry
                                                                                                                                      • 3.1.1 Functional Groups
                                                                                                                                        • 3.1.2 Types of Formulae
                                                                                                                                          • 3.1.3 Nomenclature
                                                                                                                                            • 3.1.4 Structural Isomerism
                                                                                                                                              • 3.1.5 Stereoisomerism
                                                                                                                                              • 3.2 Alkanes
                                                                                                                                                • 3.2.1 Fractional Distillation of Crude Oil
                                                                                                                                                  • 3.2.2 Modification of Alkanes by Cracking
                                                                                                                                                    • 3.2.3 Combustion of Alkanes
                                                                                                                                                      • 3.2.4 Chlorination of Alkanes
                                                                                                                                                      • 3.3 Halogenoalkanes
                                                                                                                                                        • 3.3.1 Reactivity of Halogenoalkanes
                                                                                                                                                          • 3.3.2 Reactions of Halogenoalkanes
                                                                                                                                                            • 3.3.3 Ozone Depletion
                                                                                                                                                            • 3.4 Alkenes
                                                                                                                                                              • 3.4.1 Structure, Bonding & Reactivity
                                                                                                                                                                • 3.4.2 Isomerism in Alkenes
                                                                                                                                                                  • 3.4.3 Reactions of Alkenes
                                                                                                                                                                    • 3.4.4 Test for Unsaturation
                                                                                                                                                                      • 3.4.5 Addition Polymers
                                                                                                                                                                        • 3.4.6 Solution to Plastic Pollution
                                                                                                                                                                        • 3.5 Alcohols
                                                                                                                                                                          • 3.5.1 Classifying Alcohols
                                                                                                                                                                            • 3.5.2 Alcohol Production
                                                                                                                                                                              • 3.5.3 Oxidation of Alcohols
                                                                                                                                                                                • 3.5.4 Combustion of Alcohols
                                                                                                                                                                                  • 3.5.5 Elimination Reactions of Alcohols
                                                                                                                                                                                  • 3.6 Organic Analysis
                                                                                                                                                                                    • 3.6.1 Identification of Functional Groups by Test-Tube Reactions
                                                                                                                                                                                      • 3.6.2 Mass spectrometry
                                                                                                                                                                                        • 3.6.3 Infrared Spectroscopy
                                                                                                                                                                                        • 3.7 Organic Mechanisms
                                                                                                                                                                                          • 3.7.1 Fundamentals of Reaction Mechanisms
                                                                                                                                                                                            • 3.7.2 Chlorination of Alkanes
                                                                                                                                                                                              • 3.7.3 Nucleophilic Substitution
                                                                                                                                                                                                • 3.7.4 Elimination
                                                                                                                                                                                                  • 3.7.5 Electrophilic Addition
                                                                                                                                                                                                • 4. AS Practical Skills
                                                                                                                                                                                                  • 4.1 Physical Chemistry Practicals
                                                                                                                                                                                                    • 4.1.1 Making a Volumetric Solution
                                                                                                                                                                                                      • 4.1.2 Performing a Titration & Volumetric Analysis
                                                                                                                                                                                                        • 4.1.3 Measurement of an Enthalpy Change
                                                                                                                                                                                                          • 4.1.4 Factors Affecting the Rate of a Reaction
                                                                                                                                                                                                          • 4.2 Organic & Inorganic Chemistry Practicals
                                                                                                                                                                                                            • 4.2.1 Reactions of Group 2 Elements
                                                                                                                                                                                                              • 4.2.2 Identifying Anions & Cations
                                                                                                                                                                                                                • 4.2.3 Distillation of a Product from a Reaction
                                                                                                                                                                                                                  • 4.2.4 Testing for Organic Functional Groups
                                                                                                                                                                                                                • 5. Advanced Physical Chemistry (A Level only)
                                                                                                                                                                                                                  • 5.1 Thermodynamics (A Level only)
                                                                                                                                                                                                                    • 5.1.1 Thermodynamic Terms
                                                                                                                                                                                                                      • 5.1.2 Born-Haber Cycles
                                                                                                                                                                                                                        • 5.1.3 Born-Haber Calculations
                                                                                                                                                                                                                          • 5.1.4 Comparing Lattice Enthalpies
                                                                                                                                                                                                                            • 5.1.5 Enthalpy of Solution & Hydration
                                                                                                                                                                                                                              • 5.1.6 Entropy
                                                                                                                                                                                                                                • 5.1.7 Gibbs Free Energy
                                                                                                                                                                                                                                  • 5.1.8 Reaction Feasibility
                                                                                                                                                                                                                                  • 5.2 Rate Equations (A Level only)
                                                                                                                                                                                                                                    • 5.2.1 Rate Equations
                                                                                                                                                                                                                                      • 5.2.2 Deriving Rate Equations
                                                                                                                                                                                                                                        • 5.2.3 Rate Equation Calculations
                                                                                                                                                                                                                                          • 5.2.4 The Arrhenius Equation
                                                                                                                                                                                                                                            • 5.2.5 Finding Activation Energy
                                                                                                                                                                                                                                              • 5.2.6 Concentration-Time Graphs
                                                                                                                                                                                                                                                • 5.2.7 Rate-Concentration Graphs
                                                                                                                                                                                                                                                  • 5.2.8 Rate Determining Step
                                                                                                                                                                                                                                                  • 5.3 Equilibrium constant (Kp) for Homogeneous Systems (A Level only)
                                                                                                                                                                                                                                                    • 5.3.1 Kp Expressions
                                                                                                                                                                                                                                                      • 5.3.2 Partial Pressure
                                                                                                                                                                                                                                                        • 5.3.3 Changes in Temperature & Pressure
                                                                                                                                                                                                                                                        • 5.4 Electrode Potentials & Electrochemical Cells (A Level only)
                                                                                                                                                                                                                                                          • 5.4.1 Representing Cells
                                                                                                                                                                                                                                                            • 5.4.2 Standard Electrode Potentials
                                                                                                                                                                                                                                                              • 5.4.3 Predicting Reactions
                                                                                                                                                                                                                                                                • 5.4.4 Commercial Cells
                                                                                                                                                                                                                                                                  • 5.4.5 Lithium Cells
                                                                                                                                                                                                                                                                    • 5.4.6 Fuel Cells
                                                                                                                                                                                                                                                                    • 5.5 Fundamentals of Acids & Bases (A Level only)
                                                                                                                                                                                                                                                                      • 5.5.1 Brønsted–Lowry Acid & Bases
                                                                                                                                                                                                                                                                        • 5.5.2 pH & [H⁺]
                                                                                                                                                                                                                                                                          • 5.5.3 The Ionic Product of Water
                                                                                                                                                                                                                                                                          • 5.6 Further Acids & Bases Calculations (A Level only)
                                                                                                                                                                                                                                                                            • 5.6.1 Acid Dissociation Constant
                                                                                                                                                                                                                                                                              • 5.6.2 pKₐ
                                                                                                                                                                                                                                                                                • 5.6.3 Titrations
                                                                                                                                                                                                                                                                                  • 5.6.4 pH Curves
                                                                                                                                                                                                                                                                                    • 5.6.5 Buffers
                                                                                                                                                                                                                                                                                  • 6. Advanced Inorganic Chemistry (A Level only)
                                                                                                                                                                                                                                                                                    • 6.1 Properties of Period 3 Elements & their Oxides (A Level only)
                                                                                                                                                                                                                                                                                      • 6.1.1 Na & Mg with water
                                                                                                                                                                                                                                                                                        • 6.1.2 Reaction with Oxygen
                                                                                                                                                                                                                                                                                          • 6.1.3 Melting Point Trend
                                                                                                                                                                                                                                                                                            • 6.1.4 Oxides Reacting with Water
                                                                                                                                                                                                                                                                                            • 6.2 Transition Metals (A Level only)
                                                                                                                                                                                                                                                                                              • 6.2.1 General Properties of Transition Metals
                                                                                                                                                                                                                                                                                                • 6.2.2 Ligand Exchange
                                                                                                                                                                                                                                                                                                  • 6.2.3 Shapes of Complex Ions
                                                                                                                                                                                                                                                                                                    • 6.2.4 Formation of Coloured Ions
                                                                                                                                                                                                                                                                                                      • 6.2.5 Variable Oxidation States
                                                                                                                                                                                                                                                                                                        • 6.2.6 Redox Titrations
                                                                                                                                                                                                                                                                                                          • 6.2.7 Catalysis
                                                                                                                                                                                                                                                                                                          • 6.3 Reactions of Ions in Aqueous Solution (A Level only)
                                                                                                                                                                                                                                                                                                            • 6.3.1 Metal-Aqua Ions
                                                                                                                                                                                                                                                                                                              • 6.3.2 Reactions with Bases
                                                                                                                                                                                                                                                                                                            • 7. Advanced Organic Chemistry (A Level only)
                                                                                                                                                                                                                                                                                                              • 7.1 Optical Isomerism (A-level only)
                                                                                                                                                                                                                                                                                                                • 7.1.1 Optical Isomerism
                                                                                                                                                                                                                                                                                                                  • 7.1.2 Identifying Chiral Centres
                                                                                                                                                                                                                                                                                                                    • 7.1.3 Racemic Mixtures
                                                                                                                                                                                                                                                                                                                    • 7.2 Aldehydes & Ketones (A-level only)
                                                                                                                                                                                                                                                                                                                      • 7.2.1 Aldehydes & Ketones
                                                                                                                                                                                                                                                                                                                        • 7.2.2 Reduction of Carbonyls
                                                                                                                                                                                                                                                                                                                          • 7.2.3 Nucleophilic Addition
                                                                                                                                                                                                                                                                                                                          • 7.3 Carboxylic Acids & Derivatives (A-level only)
                                                                                                                                                                                                                                                                                                                            • 7.3.1 Carboxylic Acids
                                                                                                                                                                                                                                                                                                                              • 7.3.2 Esters
                                                                                                                                                                                                                                                                                                                                • 7.3.3 Biodiesel
                                                                                                                                                                                                                                                                                                                                  • 7.3.4 Ester Hydrolysis
                                                                                                                                                                                                                                                                                                                                    • 7.3.5 Acylation
                                                                                                                                                                                                                                                                                                                                      • 7.3.6 Manufacture of Aspirin
                                                                                                                                                                                                                                                                                                                                      • 7.4 Aromatic Chemistry (A-level only)
                                                                                                                                                                                                                                                                                                                                        • 7.4.1 Structure of Benzene
                                                                                                                                                                                                                                                                                                                                          • 7.4.2 Nitration of Benzene
                                                                                                                                                                                                                                                                                                                                            • 7.4.3 Friedel–Crafts Acylation
                                                                                                                                                                                                                                                                                                                                            • 7.5 Amines (A Level only)
                                                                                                                                                                                                                                                                                                                                              • 7.5.1 Preparation of Amines
                                                                                                                                                                                                                                                                                                                                                • 7.5.2 Basic Properties
                                                                                                                                                                                                                                                                                                                                                  • 7.5.3 Nucleophilic Substitution
                                                                                                                                                                                                                                                                                                                                                    • 7.5.4 Nucleophilic Addition–Elimination
                                                                                                                                                                                                                                                                                                                                                      • 7.5.5 Quaternary Ammonium Salts
                                                                                                                                                                                                                                                                                                                                                      • 7.6 Polymers (A Level only)
                                                                                                                                                                                                                                                                                                                                                        • 7.6.1 Condensation Polymers
                                                                                                                                                                                                                                                                                                                                                          • 7.6.2 Biodegradability & Disposal of Polymers
                                                                                                                                                                                                                                                                                                                                                          • 7.7 Amino acids, Proteins & DNA (A Level only)
                                                                                                                                                                                                                                                                                                                                                            • 7.7.1 Amino Acids
                                                                                                                                                                                                                                                                                                                                                              • 7.7.2 Proteins
                                                                                                                                                                                                                                                                                                                                                                • 7.7.3 Enzymes
                                                                                                                                                                                                                                                                                                                                                                  • 7.7.4 DNA
                                                                                                                                                                                                                                                                                                                                                                    • 7.7.5 Anticancer Drugs
                                                                                                                                                                                                                                                                                                                                                                    • 7.8 Organic Synthesis (A Level only)
                                                                                                                                                                                                                                                                                                                                                                      • 7.8.1 Organic Synthesis
                                                                                                                                                                                                                                                                                                                                                                      • 7.9 Organic Mechanisms (A Level only)
                                                                                                                                                                                                                                                                                                                                                                        • 7.9.1 Organic Mechanisms
                                                                                                                                                                                                                                                                                                                                                                        • 7.10 Nuclear Magnetic Resonance Spectroscopy (A Level only)
                                                                                                                                                                                                                                                                                                                                                                          • 7.10.1 Principles of NMR
                                                                                                                                                                                                                                                                                                                                                                            • 7.10.2 ¹H NMR
                                                                                                                                                                                                                                                                                                                                                                              • 7.10.3 ¹³C NMR
                                                                                                                                                                                                                                                                                                                                                                              • 7.11 Chromatography (A-level only)
                                                                                                                                                                                                                                                                                                                                                                                • 7.11.1 Chromatography
                                                                                                                                                                                                                                                                                                                                                                                  • 7.11.2 Thin Layer Chromatography
                                                                                                                                                                                                                                                                                                                                                                                    • 7.11.3 Column Chromatography
                                                                                                                                                                                                                                                                                                                                                                                      • 7.11.4 Gas Chromatography
                                                                                                                                                                                                                                                                                                                                                                                        • 7.11.5 Interpreting Chromatograms
                                                                                                                                                                                                                                                                                                                                                                                      • 8. A-Level Practical Skills (A Level only)
                                                                                                                                                                                                                                                                                                                                                                                        • 8.1 Physical Chemistry Practicals (A Level only)
                                                                                                                                                                                                                                                                                                                                                                                          • 8.1.1 Required Practical 7
                                                                                                                                                                                                                                                                                                                                                                                            • 8.1.2 Required Practical 8
                                                                                                                                                                                                                                                                                                                                                                                              • 8.1.3 Required Practical 9
                                                                                                                                                                                                                                                                                                                                                                                                • 8.1.4 Entropy of Vaporisation
                                                                                                                                                                                                                                                                                                                                                                                                  • 8.1.5 Iodine Clock Reaction
                                                                                                                                                                                                                                                                                                                                                                                                    • 8.1.6 Determination of Kc
                                                                                                                                                                                                                                                                                                                                                                                                      • 8.1.7 Making Simple Cells
                                                                                                                                                                                                                                                                                                                                                                                                        • 8.1.8 Finding Ka
                                                                                                                                                                                                                                                                                                                                                                                                          • 8.1.9 Titration Curves
                                                                                                                                                                                                                                                                                                                                                                                                            • 8.1.10 Making Buffers
                                                                                                                                                                                                                                                                                                                                                                                                            • 8.2 Inorganic Chemistry Practicals (A Level only)
                                                                                                                                                                                                                                                                                                                                                                                                              • 8.2.1 Required Practical 11
                                                                                                                                                                                                                                                                                                                                                                                                                • 8.2.2 Testing Period 3 Oxides
                                                                                                                                                                                                                                                                                                                                                                                                                  • 8.2.3 Ligand Substitution Experiments
                                                                                                                                                                                                                                                                                                                                                                                                                    • 8.2.4 Redox Titrations
                                                                                                                                                                                                                                                                                                                                                                                                                      • 8.2.5 Vanadium Oxidation States
                                                                                                                                                                                                                                                                                                                                                                                                                        • 8.2.6 Colorimetry & Complex Ions
                                                                                                                                                                                                                                                                                                                                                                                                                          • 8.2.7 Autocatalysis Experiments
                                                                                                                                                                                                                                                                                                                                                                                                                            • 8.2.8 Identifying Ions
                                                                                                                                                                                                                                                                                                                                                                                                                              • 8.2.9 Reactions of Metal-Aqua Ions
                                                                                                                                                                                                                                                                                                                                                                                                                              • 8.3 Organic Chemistry Practicals (A Level only)
                                                                                                                                                                                                                                                                                                                                                                                                                                • 8.3.1 Required Practical 10a
                                                                                                                                                                                                                                                                                                                                                                                                                                  • 8.3.2 Required Practical 10b
                                                                                                                                                                                                                                                                                                                                                                                                                                    • 8.3.3 Testing Aldehydes & Ketones
                                                                                                                                                                                                                                                                                                                                                                                                                                      • 8.3.4 Required Practical 12


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                                                                                                                                                                                                                                                                                                                                                                                                                                    Author: Gomathi



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