0654.C4.1.01 — Define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current: past paper questions
Real questions on 0654.c4.1.01 — define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
The newest 20 of 20 written questions. Open one to see it on the real paper.
- 0973/31 · October/November 2025 · Q7b(ii)[1]
State the name of each electrode. negative electrode J
See it on the paper → - 0973/31 · October/November 2025 · Q7b(iii)[1]
Identify the products at each electrode. electrode J product
See it on the paper → - 0973/31 · October/November 2025 · Q7b(iv)[1]
The molten lead bromide cools and turns solid. Suggest why the electrolysis stops.
See it on the paper → - 0973/32 · May/June 2025 · Q5a[4]
Fig. 5.1 lists five chemical processes and the descriptions of these processes. On Fig. 5.1, draw one straight line from each process to the correct description. chemical process description loss of oxygen chlorination chromatography the decomposition of an ionic compound, when molten or in aqueous solution, by the pas...
See it on the paper → - 0973/42 · May/June 2025 · Q7b[1]
A student investigates the electrolysis of aqueous copper( II ) sulfate using copper electrodes. Fig. 7.1 shows the student’s experiment. d.c. – power + supply – copper anode aqueous copper(II) sulfate Fig. 7.1 Describe what the student observes at the anode. copper cathode + (b) Copper sulfate is also an ionic compoun...
See it on the paper → - 0973/42 · May/June 2025 · Q7c(i)[2]
Copper is deposited at the cathode. Write the ionic half-equation for the formation of copper, Cu, from copper ions, Cu 2+ .
See it on the paper → - 0973/42 · May/June 2025 · Q7c(ii)[1]
The ionic half-equation for the reaction at the anode is shown. Cu Cu 2+ + 2e – Explain if the reaction at the anode is oxidation or reduction.
See it on the paper → - 0973/31 · October/November 2024 · Q5c[2]
Copper is also extracted from its ore by electrolysis. Define electrolysis by completing the sentence. Electrolysis is the breakdown of an ionic compound when or in aqueous solution by the passage of .
See it on the paper → - 0973/41 · October/November 2024 · Q11a[2]
A scientist electrolyses 81.6 g of aluminium oxide. Calculate the maximum mass of aluminium extracted from the aluminium oxide. Show your working. [A r : Al, 27; O, 16] mass of aluminium = g
See it on the paper → - 0973/31 · May/June 2024 · Q2a(iv)[1]
used as inert electrodes in electrolysis.
See it on the paper → - 0973/41 · October/November 2023 · Q11a(ii)[2]
Explain why molten lead(II) bromide conducts electricity.
See it on the paper → - 0973/31 · October/November 2022 · Q8e(ii)[1]
Suggest a suitable electrolyte for electroplating the key.
See it on the paper → - 0973/31 · May/June 2022 · Q5c(ii)[2]
Define electrolysis.
See it on the paper → - 0973/41 · May/June 2021 · Q8a[3]
Fig. 8.1 shows an electrolysis experiment. Complete the labels on Fig. 8.1. Choose your answers from the list. anion anode cation cathode electrolyte 6 V d.c. supply – + Fig. 8.1
See it on the paper → - 0973/42 · May/June 2021 · Q13e[2]
Aluminium is extracted from aluminium oxide, Al 2 O 3 , by electrolysis. Construct the ionic half-equation for the formation of aluminium at the cathode. Use e – to represent an electron.
See it on the paper → - 0973/31 · October/November 2020 · Q8b[3]
Use words from the list to complete the sentences about electrolysis. Each word may be used once, more than once or not at all. boiling chemical current electron evaporation melting physical reacting resistance voltage In electrolysis, an electric passes through an electrolyte. The electrolyte is made either by dissolv...
See it on the paper → - 0973/31 · October/November 2020 · Q8c(i)[1]
Suggest the compound that is dissolved to form the electrolyte in apparatus Q.
See it on the paper → - 0973/31 · October/November 2020 · Q8c(ii)[1]
Suggest a reason why the solution in apparatus R does not conduct.
See it on the paper → - 0973/41 · May/June 2020 · Q5a(i)[1]
State the name of the gas made at the anode.
See it on the paper → - 0973/41 · May/June 2020 · Q5a(ii)[2]
Write the ionic half-equation for the formation of hydrogen gas.
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What examiners said
This question was very well answered. There was some confusion over which process was the result of the constant random motion of particles. Electrolysis was the best-known process.
— Examiner report, May/June 2025, 0973/32 Q5(a) (Cambridge)
Many of the candidates gave the observations that would occur at the cathode, rather than the anode.
— Examiner report, May/June 2025, 0973/42 Q7(b) (Cambridge)
This was generally well done. Some candidates gave the electrons a positive charge and some got the equation the wrong way around.
— Examiner report, May/June 2025, 0973/42 Q7(c)(i) (Cambridge)
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