OCR Gateway GCSE Chemistry

Topic Questions

GCSEChemistryOCR GatewayTopic Questions3. Chemical Reactions3.3 Types of Chemical Reactions

3.3 Types of Chemical Reactions

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11 mark

Higher Only

Lemon juice can be described as a weak acid.

What is the pH value for a weak acid?

  • pH 1

  • pH 4

  • pH 7

  • pH 14

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21 mark

What is the name of the gas made when zinc carbonate reacts with hydrochloric acid?

  • Carbon dioxide

  • Chlorine

  • Hydrogen

  • Oxygen

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31 mark

Which of these pH values shows the pH of a strong acid?

  • 1

  • 5

  • 7

  • 10

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41 mark

What is the name of the gas made when magnesium reacts with sulfuric acid?

  • Carbon dioxide

  • Carbon monoxide

  • Hydrogen

  • Oxygen

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11 mark

A student added some sulfuric acid gradually to a solution of ammonia until it was in excess.

What happens to the pH during this reaction?

  pH of ammonia at start pH after addition of excess sulfuric acid 
A 11 7
B 7 13
C 11 2
D 3 8

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2
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A solution of sulfuric acid with a pH of 4 has a hydrogen ion concentration of 1 x 10-4 mol/dm3.

Another acid has a hydrogen ion concentration of 1 x 10-6 mol/dm3.

What is the pH of this acid?

  • 2

  • 3

  • 5

  • 6

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3
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What is the ionic equation for neutralisation?

  • 2H+ (aq) + OH- (aq)   →    H2O (l)

  • H+ (aq) + OH- (aq)   →    H2O (aq)

  • H+ (aq) + OH- (aq)   →    H2O (l)

  • 2H2 + O2    →       2H2O

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41 mark

Calcium reacts with hydrochloric acid to form the salt, calcium chloride and another product. 

calcium  +   hydrochloric acid            →         calcium chloride  + ___________

What is the unknown product?

  • Water 

  • Oxygen

  • Hydrogen

  • Carbon dioxide 

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51 mark

A reaction took place between iron sulfate and magnesium. 

iron(II) sulfate + magnesium  →    magnesium sulfate + iron 

Which species has been oxidised?

  • Iron

  • Magnesium

  • Sulfur

  • None of the above 

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61 mark

Zinc is extracted from zinc oxide by reduction.

zinc oxide + carbon   →    zinc + carbon dioxide 

Which element acts a reducing agent during this process?

  • Hydrogen

  • Oxygen

  • Carbon

  • Zinc 

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71 mark

Which statement correctly describes a strong acid? 

  • Fully ionise in solution and have a high concentration of H+ ions

  • Fully ionise in solution and have a low concentration of H+ ions

  • Partially ionise in solution and have a high concentration of H+ ions

  • Partially ionise in solution and have a low concentration of H+ ions

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81 mark

Sodium hydroxide reacts with sulfuric acid. 

__NaOH + __H2SO4         →          __Na2SO4   +    __H2O

Which numbers correctly balance the equation?

  • 1, 2, 2, 1

  • 2, 2, 1, 2

  • 2, 1, 1, 2 

  • 1, 1, 2, 2

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91 mark

What is the pH of a weak acid?

  • 2

  • 6

  • 7

  • 11

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101 mark

A displacement reaction occurs between zinc and copper chloride.

Which half equation correctly shows the change that zinc undergoes? 

  • Zn2+(aq) + 2e-  →    Zn (s)

  • Zn (s) + 2e-  →    Zn2+ (aq)

  • Zn2+ (aq)  → Zn (s) + 2e-

  • Zn (s)  →    Zn2+ (aq) + 2e-

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111 mark

Sodium hydroxide reacts with hydrochloric acid. Sodium chloride and water are made.

What is the name of this type of reaction?

  • Neutralisation

  • Oxidation

  • Reduction

  • Thermal decomposition

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121 mark

Neutralisation occurs when acids react with alkalis.

What is the ionic equation for neutralisation?

  • H+ + OH− → H2O

  • H- + OH+ → H2O

  • H+ + OH+ → H2O

  • H- + OH− → H2O

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131 mark

Look at the equation.

CH4 + 2O2 → CO2 + 2H2O

Which substance is oxidised in this reaction?

  • CH4

  • CO2

  • H2O

  • O2

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141 mark

Look at the equation.

CH4 + 2O2 → CO2 + 2H2O

Which substance is the oxidising agent in this reaction?

  • CH4

  • CO2

  • H2O

  • O2

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151 mark

A student measures the pH of an acid and an alkali.

He adds magnesium metal to the acid and to the alkali.

What results should he expect?

Acid Alkali
  pH Reaction with magnesium pH Reaction with magnesium
A Below 7 No reaction Above 7 Magnesium fizzes
B Below 7 Magnesium fizzes Above 7 No reaction
C Above 7 Magnesium fizzes Above 7 No reaction
D Above 7 No reaction Above 7 Magnesium fizzes

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161 mark

Which equation represents neutralisation?

  • 2H+ → H2

  • H2O → H+ + OH-

  • H+ + OH- → H2O

  • 2OH- → O2 + H2

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171 mark

Magnesium reacts with copper oxide.

Magnesium oxide and copper are made.

magnesium + copper oxide → magnesium oxide + copper

Which substance is the reducing agent?

  • Copper

  • Copper oxide

  • Magnesium

  • Magnesium oxide

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181 mark

Higher Only

Which is the best explanation of a concentrated acid?

  • The acid is completely ionised in solution in water.

  • The acid is partially ionised in solution in water.

  • There is a large amount of acid and a small amount of water.

  • There is a large amount of water and a small amount of acid.

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191 mark

Magnesium powder reacts with copper(II) oxide. Magnesium oxide and copper are made.

Mg + CuO → MgO + Cu

Which substance is the reducing agent?

  • Magnesium

  • Copper oxide

  • Magnesium oxide

  • Copper

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201 mark

Higher Only

The equation shows a reaction that involves both oxidation and reduction.

Fe2O3 + 2Al → Al2O3 + 2Fe

Which statement about reduction is correct?

  • The gain of oxygen and the gain of electrons by a substance

  • The gain of oxygen and the loss of electrons by a substance

  • The loss of oxygen and the gain of electrons by a substance

  • The loss of oxygen and the loss of electrons by a substance

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21
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A student investigates some acids.

She has a solution of hydrochloric acid of concentration 0.01 mol / dm3.

This solution has a pH of 2.

She increases the concentration of hydrochloric acid from 0.01 mol / dm3 to 0.1 mol / dm3.

What is the pH of this new solution?

  • 0

  • 1

  • 3

  • 12

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221 mark

Higher Only

What is the best explanation of what is meant by a strong acid?

  • There is a large amount of acid and a small amount of water.

  • There is a small amount of acid and a large amount of water.

  • The acid is completely ionised in solution in water.

  • The acid is partially ionised in solution in water.

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231 mark

Which equation represents neutralisation?

  • 4H+ → 2H2

  • H2O → 2H+ + O2–

  • H+ + OH– → H2O

  • O2 + H2 → H2O + O2–

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