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Chapter 6 Practice Paper: Acids and Bases — question paper

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QQ/S3CH/CH6

Secondary 3 · Chemistry (G2 / G3)

Chapter 6 Practice Paper

Acids and Bases

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
  • Chemical equations should be balanced, with state symbols shown where the question asks for them.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is shown on its cover.

Original practice material written for the MOE Chemistry syllabus. It is not an official MOE or school examination paper. Chapter 6 (acid reactions, strong vs weak acids, pH, neutralisation, oxides).

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

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which observation identifies the reaction of a carbonate with dilute acid?

    1. Aa pop with a lighted splint
    2. Ba gas that turns limewater milky
    3. Ca colourless solution with no gas
    4. Da red flame
    ( )
  2. 2

    Which pair names a strong acid and a weak acid?

    1. Aethanoic acid and hydrochloric acid
    2. Bhydrochloric acid and ethanoic acid
    3. Csulfuric acid and nitric acid
    4. Dcitric acid and carbonic acid
    ( )
  3. 3

    The pH of solution A is 3 and of solution B is 5. The H⁺(aq) concentration of A compared with B is

    1. A2 times higher
    2. B20 times higher
    3. C100 times higher
    4. Dthe same
    ( )
  4. 4

    Solid magnesium hydroxide is only slightly soluble, yet it neutralises acid effectively. This is because

    1. Aneutralisation needs no OH⁻ ions
    2. BMg(OH)₂ is an acid
    3. Cwater acts as the base
    4. Das the small amount dissolved is used up, more Mg(OH)₂ dissolves to replace it
    ( )
  5. 5

    Which equation shows zinc oxide behaving as a base?

    1. AZnO + 2HCl → ZnCl₂ + H₂O
    2. BZnO + 2NaOH → Na₂ZnO₂ + H₂O
    3. CZnO → Zn + ½O₂
    4. DZnO + H₂O → Zn(OH)₂
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Include state symbols where the question asks, and balance every equation.

  1. 1

    Dilute hydrochloric acid is added to three samples: magnesium ribbon, calcium carbonate granules and copper turnings.

    1. (a)

      Write the equation for the reaction with magnesium, naming the gas.

      [2]
    2. (b)

      Write the equation for the reaction with calcium carbonate, and state the observation.

      [2]
    3. (c)

      Explain why the copper turnings show no reaction.

      [2]
  2. 2

    Two beakers contain equal volumes of acid: beaker X holds 0.10 mol/dm³ hydrochloric acid (strong); beaker Y holds 0.10 mol/dm³ ethanoic acid (weak). Magnesium strips of equal size are dropped into both.

    1. (a)

      State which reaction fizzes faster, and explain in terms of ions.

      [3]
    2. (b)

      Both acids are described as "0.10 mol/dm³". Explain why this does not contradict the difference in rate.

      [2]
  3. 3

    A gardener treats a flowerbed of acidic soil with calcium hydroxide (slaked lime).

    1. (a)

      Explain, with an ionic equation, why slaked lime raises the soil pH.

      [2]
    2. (b)

      State one reason the farmer must not add too much slaked lime.

      [2]
  4. 4

    Four oxides are tested with dilute hydrochloric acid and then with dilute sodium hydroxide: P dissolves in both; Q dissolves only in the acid; R dissolves in neither; S dissolves only in the alkali.

    1. (a)

      Classify each oxide, giving one possible identity for R.

      [4]
    2. (b)

      Write the equation for P reacting with the acid (use aluminium oxide).

      [1]

— End of paper —