0654.C4.1.05 — Identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(II) sulfate usin: past paper questions
Real questions on 0654.c4.1.05 — identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(ii) sulfate usin
The newest 6 of 6 written questions. Open one to see it on the real paper.
- 0973/32 · May/June 2024 · Q2a(v)[1]
is used in electroplating.
See it on the paper → - 0973/41 · October/November 2023 · Q11c(i)[1]
The student forgot to record the mass of the cathode after the electrolysis. Suggest the change in mass of the cathode in grams. Write your answer in Table 11.1.
See it on the paper → - 0973/41 · October/November 2023 · Q11c(ii)[2]
The anode loses mass. Explain why the anode loses mass.
See it on the paper → - 0973/42 · May/June 2023 · Q11d(ii)[2]
The experiment is repeated using copper electrodes instead of inert electrodes. Describe what happens at the anode and the cathode using copper electrodes. anode cathode
See it on the paper → - 0973/41 · October/November 2022 · Q11b(i)[1]
State the name of the electrolyte solution the student uses.
See it on the paper → - 0973/41 · October/November 2022 · Q11b(ii)[1]
The student uses impure copper as the anode. State what the student uses as the cathode.
See it on the paper →
What examiners said
Many candidates did not suggest the change in mass of the cathode after the electrolysis. Those candidates that did suggest a value usually gave the answers of 0.0 or –0.62.
— Examiner report, October/November 2023, 0973/41 Q11(c)(i) (Cambridge)
Candidates found this question about explaining why the anode loses mass very challenging. Many candidates wrote about the anode oxidising, copper reacting with sulfate and the anode losing oxygen. Few candidates understood that copper atoms become copper ions and that these copper ions move into solution.
— Examiner report, October/November 2023, 0973/41 Q11(c)(ii) (Cambridge)
A description of the events occurring at the cathode were generally more successful than the events occurring at the anode. Careful attention should be drawn to the command word, which in this case was describe. A statement of the products found at each of the electrodes was insufficient. It was important that candidates recognised that copper electrodes were used rather than carbon electrodes.
— Examiner report, May/June 2023, 0973/42 Q11(d)(ii) (Cambridge)
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