GCSEChemistry: Combined ScienceOCR GatewayExam Questions3. Chemical Reactions3.3 Types of Chemical Reactions

 Types of Chemical Reactions (OCR Gateway GCSE Chemistry: Combined Science)

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3.3 Types of Chemical Reactions

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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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    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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    31 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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    41 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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    51 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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    61 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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    71 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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    81 mark

    What is the pH of a weak acid?

    • 2

    • 6

    • 7

    • 11

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    91 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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    101 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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    111 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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    121 mark

    Look at the equation.

    CH4 + 2O2 → CO2 + 2H2O

    Which substance is oxidised in this reaction?

    • CH4

    • CO2

    • H2O

    • O2

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    131 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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    141 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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      151 mark

      Which equation represents neutralisation?

      • 2H+ → H2

      • H2O → H+ + OH-

      • H+ + OH- → H2O

      • 2OH- → O2 + H2

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      161 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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      171 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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      181 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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      191 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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      201 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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      211 mark

      Which equation represents neutralisation?

      • 4H+ → 2H2

      • H2O → 2H+ + O2–

      • H+ + OH– → H2O

      • O2 + H2 → H2O + O2–

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