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
11–20 of 80 · Easy
Question 11
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 12
1 mark · Easy
Answer and see the solution →State the name given to a negatively charged ion formed when an atom gains electrons.
Question 13
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 14
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 15
1 mark · Easy
Answer and see the solution →State the product formed at the cathode during the electrolysis of molten calcium chloride ().
Question 16
3 marks · Easy
Answer and see the solution →The diagram shows the apparatus used to electrolyse molten lithium iodide ().
Electrolysis apparatus for molten LiI Answer the following questions about this electrolysis.
(a)[1 mark]Name the ion in molten that is attracted to the cathode.
(b)[1 mark]State what is formed at the anode.
(c)[1 mark]Write the half-equation for the reaction at the cathode.
Question 17
2 marks · Easy
Answer and see the solution →Write the balanced half-equation for the reaction at the anode during the electrolysis of molten potassium bromide (), and state how many electrons are involved per bromine molecule formed.
Question 18
3 marks · Easy
Answer and see the solution →The table below shows the ions present in three molten ionic compounds:
Compound Ions present A: MgF_2 B: KCl C: CaBr_2 (a)[1 mark]For compound B, name the product formed at the anode.
(b)[1 mark]For compound C, write the half-equation for the reaction at the cathode.
(c)[1 mark]For compound A, state the formula of the ion that gains electrons at the cathode.
Question 19
1 mark · Easy
Answer and see the solution →Write the formula of the ion that is reduced at the cathode when molten barium chloride () is electrolysed.
Question 20
3 marks · Easy
Answer and see the solution →Molten tin(II) chloride () is electrolysed using inert electrodes.
(a)[1 mark]Name the element formed at the cathode.
(b)[1 mark]Write the half-equation for the reaction at the anode.
(c)[1 mark]Explain briefly what happens to the ions during electrolysis.