Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Electrolysis
198 practice questions
Topics covered
- Why things conduct electricity17 practice questions
- Passing electricity through compounds: electrolysis20 practice questions
- The electrolysis of molten compounds19 practice questions
- Electrolysis and redox19 practice questions
- The electrolysis of other molten substances19 practice questions
- The electrolysis of aqueous solutions18 practice questions
- The electrolysis of sodium chloride solution19 practice questions
- The electrolysis of copper(ii) sulfate solution using inert electrodes18 practice questions
- The electrolysis of some other solutions using inert electrodes19 practice questions
- What would happen with non-electrolytes?19 practice questions
Practice questions
31–40 of 80 · Easy
Question 31
1 mark · Easy
Answer and see the solution →State which element forms at the anode during the electrolysis of molten magnesium oxide.
Question 32
3 marks · Easy
Answer and see the solution →The electrolysis of molten zinc(II) chloride produces two substances at the electrodes.
(a)[1 mark]Write the ionic half-equation for the reaction at the cathode.
(b)[1 mark]Write the ionic half-equation for the reaction at the anode.
(c)[1 mark]State which type of particle (cation or anion) moves towards the cathode.
Question 33
2 marks · Easy
Answer and see the solution →Balance the following ionic half-equation for the electrolysis of molten calcium chloride so that both atoms and charges balance:
Question 34
2 marks · Easy
Answer and see the solution →Explain why sodium, and not chlorine, is formed at the cathode during the electrolysis of molten sodium chloride.
Question 35
3 marks · Easy
Answer and see the solution →A student studies the electrolysis of three molten ionic compounds.
Results of Electrolysis Compound Element at Cathode Element at Anode Magnesium fluoride ? Fluorine Lead(II) bromide Lead ? Potassium iodide ? Iodine (a)[1 mark]Complete the table by naming the element formed at the cathode for magnesium fluoride.
(b)[1 mark]Name the element formed at the anode for lead(II) bromide.
(c)[1 mark]Name the element formed at the cathode for potassium iodide.
Question 36
1 mark · Easy
Answer and see the solution →How many electrons are required to balance the following ionic half-equation for the reduction of potassium ions during the electrolysis of molten potassium chloride?
Question 37
3 marks · Easy
Answer and see the solution →This question is about the electrolysis of molten lithium bromide.
(a)[1 mark]Name the particle that moves towards the anode.
(b)[1 mark]State the element formed at the cathode.
(c)[1 mark]Explain, using ions, how you know which element forms at the cathode.
Question 38
2 marks · Easy
Answer and see the solution →Write the balanced ionic half-equation for oxygen formation at the anode during the electrolysis of molten aluminium oxide.
Question 39
1 mark · Easy
Answer and see the solution →State why the volume of chlorine gas collected at the anode is usually less than expected during the electrolysis of concentrated sodium chloride solution.
Question 40
3 marks · Easy
Answer and see the solution →A student is asked to investigate the electrolysis of an aqueous sodium chloride solution in the laboratory.
(a)[2 marks]Describe how you would set up apparatus to collect the products formed during this electrolysis.
(b)[1 mark]State one safety precaution you should take when performing this experiment.