0654.C4.1.03 — Identify the products formed at the electrodes and describe the observations made during the electrolysis of: (a). molten lead(II) bromide (: past paper questions
Real questions on 0654.c4.1.03 — identify the products formed at the electrodes and describe the observations made during the electrolysis of: (a). molten lead(ii) bromide (
The newest 7 of 7 written questions. Open one to see it on the real paper.
- 0654/32 · February/March 2025 · Q8d(ii)[2]
Identify the gases produced at the positive electrode and at the negative electrode in this experiment. gas at positive electrode
See it on the paper → - 0654/42 · February/March 2025 · Q8a[1]
Draw arrows on Fig. 8.1 to show the direction of movement of the ions.
See it on the paper → - 0654/42 · February/March 2025 · Q8b(i)[1]
State the name of the product formed at the anode.
See it on the paper → - 0654/42 · February/March 2025 · Q8b(ii)[1]
Describe what would be observed at the anode.
See it on the paper → - 0654/42 · February/March 2025 · Q8c[2]
Write the ionic half-equation for the reaction of copper ions, Cu 2+ , to form copper, Cu.
See it on the paper → - 0654/11 · October/November 2020 · Q17[1]
Which row shows the change in mass of each electrode?
See it on the paper → - 0654/21 · May/June 2019 · Q17[1]
What is the electrolyte that is used when a nickel spoon is electroplated with copper?
See it on the paper →
What examiners said
Occasionally only one arrow was drawn. However, many candidates were able to draw the direction of movement of the ions to the correct electrodes.
— Examiner report, February/March 2025, 0654/42 Q8(a) (Cambridge)
Only the strongest candidates were able to identify the product formed at the anode. Responses included copper ions, sulfate ions, water and sulfuric acid.
— Examiner report, February/March 2025, 0654/42 Q8(b)(i) (Cambridge)
Some candidates tried to describe this in terms of loss of electrons or oxidation. The question asked for the observations which should have referred to some form of bubbling or effervescence.
— Examiner report, February/March 2025, 0654/42 Q8(b)(ii) (Cambridge)
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