OCR A Level Chemistry

Topic Questions

A LevelChemistryOCRTopic Questions2. Foundations in Chemistry2.4 Electrons, Bonding & Structure

2.4 Electrons, Bonding & Structure

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11 mark

Which of the following has a complete sub-shell?

  • Mg

  • Si

  • Co

  • Cl

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21 mark

The electron configuration of metal M is 1s22s22p63s2

What is the formula of a compound formed when metal M reacts with oxygen?

  • MO

  • MO2

  • M2O

  • M2O3

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31 mark

Which shows the correct number of electrons that can be held in each of the following?

  3rd shell p sub-shell p orbital
A 8 2 6
B 8 6 2
C 18 2 6
D 18 6 2

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41 mark

Which of the following is the electron configuration of an atom with an atomic number of 36?

  • 1s22s22p63s13p64s24p63d10

  • 1s22s22p63s23p63d104p65s2

  • 1s22s22p63s23p64s23d10

  • 1s22s22p63s23p64s23d104p6

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51 mark

What is the correct sequence for the orbitals shown in an atom of iron in order of increasing energy?

  • 3s 3p 4s 3d

  • 3p 4s 3d 4p

  • 3d 4s 3p 3s

  • 3s 3p 3d 4s

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61 mark

Which of the following compounds is not bonded ionically?

  • CH3OH

  • MgCO3

  • LiOH

  • BaCl2

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71 mark

Which statement about the electrical conductivity of sodium sulfide is correct?

  • It conducts when solid and liquid

  • It conducts when solid but not when liquid

  • It conducts when liquid but not when solid

  • It does not conduct when liquid or solid

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81 mark

Which of the following contains a dative covalent bond?

  • N2

  • NH3

  • CN-

  • NH4+

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91 mark

Magnesium oxide has a very high melting temperature.

Which of the following is the best description of its structure and bonding?

  • Giant ionic

  • Giant metallic

  • Macromolecular

  • Simple molecular

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101 mark

Which crystal structure does not conduct electricity when solid, has a high melting point and can conduct electricity when molten?

  • Giant metallic

  • Giant ionic

  • Macromolecular

  • Simple molecular

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11 mark

How many orbitals are occupied in a silicon atom?

  • 5

  • 7

  • 8

  • 9

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21 mark

Which of the following statements about electrons filling orbitals is/are correct?

  1. Electrons follow Aufbau’s principle because it is energetically more stable.
  2. Electrons follow the Pauli Exclusion principle because the energy needed to jump to the next higher empty orbital is more than the spin-pair repulsion.
  3. Electrons that individually occupy orbitals must have the same spin to minimize repulsion.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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31 mark

What are the electron configurations of V2+ and As3- respectively?

A

1s22s22p63s23p63d14s2

1s22s22p63s23p63d104s24p6

B

1s22s22p63s23p63d14s2

1s22s22p63s23p63d104s14p6

C

1s22s22p63s23p63d3

1s22s22p63s23p63d104s24p6

D

1s22s22p63s23p63d3

1s22s22p63s23p63d104s14p6

 

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41 mark

What is the correct order for the melting points of the following metal oxides?

  • Na2O > MgO > CaO

  • MgO > CaO > Na2O

  • MgO > Na2O > CaO

  • Na2O > CaO > MgO

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51 mark

Which statements about boron trichloride (BCl3), aluminium chloride (Al2Cl6), and the product of the reaction between hydrochloric acid and ethylamine is/are correct?

  1. The product of the reaction between hydrochloric acid and ethylamine contains covalent and ionic bonding.
  2. All three species contain an electron deficient atom.
  3. All three species contain a dative covalent bond.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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11 mark

Atoms of an unknown element contain six unpaired electrons.

What could the unknown element be?

  • Argon

  • Carbon

  • Chromium

  • Iron

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21 mark

What is the electronic configuration of the ion with a single negative charge and the atomic number 35?

  • 1s2 2s2 2p6 3s2 3p6 

  • 1s2 2s2 2p6 3s2 3p5 

  • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 

  • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 

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31 mark

Which of the following compounds has both covalent and ionic bonds?

  • Calcium chloride, CaCl2 

  • Sodium nitrate, NaNO3

  • Propanoic acid, CH3CH2COOH

  • 1,2-dibromoethane, CH2BrCH2Br

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41 mark

When can sodium chloride conduct electricity?

  Solid Molten Aqueous
A ✓ ✓ X
B ✓ X ✓
C X ✓ ✓
D X X ✓

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51 mark

Which of the following statements about ions and ionic compounds are true? 

  1.   Nitrogen can form a 3- ion
  2.   Potassium can form a cation
  3.   The formula for aluminium chloride is AlCl2

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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61 mark

Which statement about bonding is not correct?

  • Covalent bonding is the strong electrostatic attraction between the nuclei of the bonded atoms.

  • A dative covalent bond is a covalent bond where both electrons in the bond come from the same atom.

  • Ionic bonding is the strong electrostatic attraction between oppositely charged particles.

  • Dative covalent bonding requires an electron-deficient compound.

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71 mark

Which element has the greatest number of singly occupied orbitals?

  • Si

  • F

  • Be

  • Ga

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81 mark

Which chemical has the highest melting point?

  • Sulfur

  • Calcium oxide

  • Lithium

  • Sodium fluoride

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91 mark

Which species contain dative covalent bonds?

  1. Al2Cl6 
  2. NH4+ 
  3. NH3BF3

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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