Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Passing electricity through compounds: electrolysis
20 practice questions
Practice questions
1–10 of 20
Question 1
1 mark · Easy
Answer and see the solution →State the name of the liquid or solution that undergoes electrolysis and contains ions.
Question 2
3 marks · Easy
Answer and see the solution →The diagram shows an apparatus for electrolysis.
(a)[1 mark]Name the positively charged electrode.
(b)[1 mark]Name the negatively charged electrode.
(c)[1 mark]Give the term for the solution or molten compound that contains ions in this process.
Question 3
2 marks · Easy
Answer and see the solution →How many positive ions and how many negative ions are present in the formula unit of magnesium bromide ()? State the name for each type of ion.
Question 4
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 5
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 6
1 mark · Easy
Answer and see the solution →State the name given to a negatively charged ion formed when an atom gains electrons.
Question 7
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 8
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 9
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 10
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.