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Chapter 7 Practice Paper: Acids, bases and salt preparations — question paper

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GCSE (9–1) · GCSE Chemistry (Foundation and Higher)

Chapter 7 Practice Paper

Acids, bases and salt preparations

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
  • Section B contains structured questions. Write your answers in the spaces provided.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total mark for this paper is 30.

Original practice material written for the MOE GCSE Chemistry syllabus. It is not an official MOE or school examination paper. Chapter 7: pH and indicators, H⁺/OH⁻, strong vs weak acids, acid reactions with metals/oxides/hydroxides/carbonates, salt prediction, the salt-making required practical.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

  1. 1

    A solution turns universal indicator green. Its pH is about

    1. A1
    2. B4
    3. C11
    4. D7
    ( )
  2. 2

    Aqueous alkalis contain high concentrations of

    1. AOH⁻ ions
    2. BH⁺ ions
    3. CCl⁻ ions
    4. Delectrons
    ( )
  3. 3

    Which reaction makes hydrogen gas?

    1. AAcid + alkali
    2. BAcid + metal oxide
    3. CAcid + metal
    4. DAcid + carbonate
    ( )
  4. 4

    Nitric acid and potassium hydroxide react to give

    1. Apotassium chloride + water
    2. Bpotassium nitrate + water
    3. Cpotassium nitride + hydrogen
    4. Dpotassium sulfate + water
    ( )
  5. 5

    In the salt-making practical, the acid is warmed before adding the base because warming

    1. Aspeeds up the reaction between acid and base
    2. Bmakes the acid stronger
    3. Cevaporates the water early
    4. Dturns the oxide into an alkali
    ( )
  6. 6

    A weak acid differs from a strong acid of the same concentration because the weak acid

    1. Acannot neutralise alkalis
    2. Bhas a pH below 1
    3. Cionises only partially, so has fewer H⁺ ions in solution
    4. Dcontains fewer acid molecules
    ( )
  7. 7

    The residue when filtering the copper oxide + sulfuric acid mixture is

    1. Acopper sulfate solution
    2. Bcopper crystals
    3. Cwater
    4. Dexcess copper oxide
    ( )
  8. 8

    Moving from pH 5 to pH 3, the hydrogen ion concentration

    1. Ahalves
    2. Bincreases 100-fold
    3. Cdoubles
    4. Dincreases 10-fold
    ( )
  9. 9

    Which salt forms when sulfuric acid reacts with zinc oxide?

    1. AZinc sulfate chloride
    2. BZinc nitrate
    3. CZinc oxide sulfate
    4. DZinc sulfate
    ( )
  10. 10

    Liming fields with calcium hydroxide works because the alkali

    1. Aneutralises the acids in the soil
    2. Bdissolves plant roots
    3. Ckills the crops
    4. Dmakes the soil more acidic
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 11

    A student prepares magnesium sulfate crystals by reacting magnesium carbonate with dilute sulfuric acid.

    1. (a)

      Write the word equation for the reaction.

      [2]
    2. (b)

      Describe how the student would obtain pure, dry crystals, naming each technique.

      [3]
    3. (c)

      State one observation during the reaction.

      [1]
  2. 12

    Two acids are tested at 25 °C. Acid P is hydrochloric acid of pH 1. Acid Q is ethanoic acid of pH 4. Equal volumes of each are placed in flasks with identical magnesium ribbon.

    Observations after 1 minute

    FlaskObservation
    PVigorous fizzing; ribbon shrinking quickly
    QVery slow fizzing; ribbon unchanged
    1. (a)

      How many times more H⁺ does acid P hold per unit volume than Q? Explain.

      [2]
    2. (b)

      Explain the difference in the observations.

      [3]
    3. (c)

      After an hour, both ribbons have fully dissolved. Explain how Q managed this despite its slow start.

      [2]
  3. 13

    This question is about the required practical: copper oxide + sulfuric acid → copper sulfate crystals.

    1. (a)

      Write the balanced symbol equation for the reaction.

      [2]
    2. (b)

      A student evaporates the filtrate to complete dryness over a roaring flame. Give two criticisms.

      [2]
    3. (c)

      The label on the acid says “0.5 mol/dm³”. Another bottle says “concentrated”. Explain whether these statements describe the same property.

      [2]
    4. (d)

      State why the copper sulfate crystals are rinsed with a little cold distilled water and dried between filter papers.

      [1]

— End of paper —