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4.3 Electrolysis

4.3 Electrolysis

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Question 4

This question is about ionic compounds and electrolysis.

Calcium bromide is an ionic compound.

a.

Calcium and bromine react to produce calcium bromide. Describe what happens to calcium atoms and bromine atoms when the ionic compound calcium bromide is formed.

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b.

Solid calcium bromide cannot be electrolysed. Give one reason why.

[1]
c.

Name the product formed at the negative electrode (cathode) when aqueous calcium bromide solution is electrolysed.

[1]
d.

Select the correct half equation for the reaction at the positive electrode (anode) when aqueous calcium bromide solution is electrolysed:

  • A: 2Br−→Br2+2e−2\text{Br}^- \rightarrow \text{Br}_2 + 2\text{e}^-2Br−→Br2​+2e−
  • B: Br2+2e−→2Br−\text{Br}_2 + 2\text{e}^- \rightarrow 2\text{Br}^-Br2​+2e−→2Br−
  • C: 4OH−→O2+2H2O+4e−4\text{OH}^- \rightarrow \text{O}_2 + 2\text{H}_2\text{O} + 4\text{e}^-4OH−→O2​+2H2​O+4e−
  • D: O2+2H2O+4e−→4OH−\text{O}_2 + 2\text{H}_2\text{O} + 4\text{e}^- \rightarrow 4\text{OH}^-O2​+2H2​O+4e−→4OH−
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Markscheme

4.3 Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /4.3 Electrolysis

12 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1 The process of electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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