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
21–30 of 198
Question 21
2 marks · Easy
Answer and see the solution →Describe how you could investigate whether molten lead(II) bromide conducts electricity. Explain the observation that would show conduction is occurring.
Question 22
3 marks · Easy
Answer and see the solution →The table shows the roles of electrodes and ions in electrolysis of sodium bromide solution.
(a)[0 marks]Part Type Charge Electrode A Electrode B Na^+ ion Br^- ion (b)[3 marks]Complete the table by naming the type (anode/cathode/cation/anion) and the charge (+/–) for each part.
Question 23
1 mark · Easy
Answer and see the solution →State the name given to a negatively charged ion formed when an atom gains electrons.
Question 24
3 marks · Easy
Answer and see the solution →Describe an experiment to investigate the electrolysis of aqueous copper(II) sulfate solution using copper electrodes.
(a)[1 mark]Name the apparatus needed for this investigation.
(b)[1 mark]State what you would observe at the electrodes during electrolysis.
(c)[1 mark]Explain briefly why a change occurs at the anode.
Question 25
2 marks · Easy
Answer and see the solution →The formula of calcium chloride is . Explain which ions are present and give their names and charges.
Question 26
2 marks · Normal
Answer and see the solution →State the charges of (a) a cation and (b) an anion.
(a)[1 mark]Cation
(b)[1 mark]Anion
Question 27
4 marks · Normal
Answer and see the solution →An experiment is set up to investigate the electrolysis of molten potassium iodide using inert carbon electrodes.
(a)[1 mark]State the name given to the liquid that conducts electricity during electrolysis.
(b)[2 marks]Describe how you would safely set up an experiment to carry out electrolysis on molten potassium iodide, naming the electrodes you would use.
(c)[1 mark]State one safety precaution you should take during this experiment.
Question 28
3 marks · Normal
Answer and see the solution →The diagram below represents an electrolytic cell with a solution of sodium chloride ( ) and two electrodes.
(a)[1 mark]Name the electrode where reduction occurs.
(b)[1 mark]Give the name and charge of the ions that move to the anode in this process.
(c)[1 mark]State the term used for the substance, other than electrodes, that is necessary for electrolysis to occur in this experiment.
Question 29
3 marks · Normal
Answer and see the solution →Explain why molten magnesium chloride ( ) conducts electricity, but solid magnesium chloride does not. Use your knowledge of ionic compounds and their structure.
Question 30
2 marks · Normal
Answer and see the solution →State what is meant by (a) an anion, and (b) a cation.