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GCSEChemistryOCRChemistry A (Gateway)Exam Questions3. Chemical ReactionsTypes of Chemical Reactions

Types of Chemical Reactions (OCR GCSE Chemistry A (Gateway)): Exam Questions

Exam code: J248

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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

Choose your answer

21 mark

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

  • Carbon dioxide

  • Chlorine

  • Hydrogen

  • Oxygen

Choose your answer

31 mark

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

  • 1

  • 5

  • 7

  • 10

Choose your answer

41 mark

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

  • Carbon dioxide

  • Carbon monoxide

  • Hydrogen

  • Oxygen

Choose your answer

51 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 

Choose your answer

61 mark

A solution of hydrochloric acid is pH 2. The acid solution is diluted, and the pH is now 3.

By what factor is the acid solution diluted?

  • 5

  • 10

  • 100

  • 1000

Choose your answer

71 mark

Which diagram represents a strong, dilute acid?

  • strong-and-weak-a
  • strong-and-weak-b
  • strong-and-weak-c
  • strong-and-weak-d

Choose your answer

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

    Choose your answer

    2
    Sme Calculator    1 mark

    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

    Choose your answer

    31 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 

    Choose your answer

    41 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

    Choose your answer

    51 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

    Choose your answer

    61 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

    Choose your answer

    71 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

    Choose your answer

    81 mark

    Look at the equation.

    CH4 + 2O2 → CO2 + 2H2O

    Which substance is oxidised in this reaction?

    • CH4

    • CO2

    • H2O

    • O2

    Choose your answer

    91 mark

    Look at the equation.

    CH4 + 2O2 → CO2 + 2H2O

    Which substance is the oxidising agent in this reaction?

    • CH4

    • CO2

    • H2O

    • O2

    Choose your answer

    101 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

      Choose your answer

      111 mark

      Which equation represents neutralisation?

      • 2H+ → H2

      • H2O → H+ + OH-

      • H+ + OH- → H2O

      • 2OH- → O2 + H2

      Choose your answer

      121 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

      Choose your answer

      131 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.

      Choose your answer

      141 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

      Choose your answer

      151 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

      Choose your answer

      161 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.

      Choose your answer

      171 mark

      Which equation represents neutralisation?

      • 4H+ → 2H2

      • H2O → 2H+ + O2–

      • H+ + OH– → H2O

      • O2 + H2 → H2O + O2–

      Choose your answer

      181 mark

      Nitrogen monoxide, NO, can be oxidised to form nitrogen dioxide, NO2.

      2NO + O2 → 2NO2

      What is the oxidising agent in this reaction?

      • nitrogen

      • nitrogen dioxide

      • nitrogen monoxide

      • oxygen

      Choose your answer

      1
      Sme Calculator      1 mark

      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

      Choose your answer

      21 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 

      Choose your answer

      31 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-

      Choose your answer

      4
      Sme Calculator      1 mark

      Higher Only

      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

      Choose your answer

      51 mark

      Which statement about an oxidising agent is correct?

      • It gains oxygen in a reaction.

      • It is oxidised in a reaction.

      • It is reduced in a reaction.

      • It loses electrons in a reaction.

      Choose your answer

      61 mark

      This is the balanced symbol equation for the reaction of copper oxide with carbon.

      2CuO + C → 2Cu + CO2

      What happens to the copper oxide in this reaction?

      • It is neutralised.

      • It is oxidised.

      • It is reduced.

      • It is thermally decomposed.

      Choose your answer