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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter

Chemical Tests

68 practice questions

Start practising (31 questions)

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Practice questions

31–31 of 31 · Normal

  1. Question 31

    6 marks · Normal

    A student tests an unknown powder. To show if the powder contains water and carbonate ions, the following experiments are carried out.

    (a)

    Describe the chemical test used to show if the powder contains water.

    [2 marks]
    (b)

    A sample of the powder is added to dilute acid and gas is released. The gas is bubbled through limewater, which becomes cloudy.

    (i)

    Identify the ion present responsible for the release of this gas.

    [1 mark]
    (ii)

    Write the ionic equation for the reaction between this ion and dilute acid.

    [2 marks]
    (iii)

    Suggest a physical test to confirm if the water in the sample is pure.

    [1 mark]
    Answer and see the solution →