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.
- 0973/32 · May/June 2024 · Q8e[2]
When concentrated aqueous sodium chloride is electrolysed, gases are released at each inert electrode. State the names of the gases released at each electrode. gas at cathode gas at anode
See it on the paper → - 0973/41 · October/November 2023 · Q11a(i)[1]
When molten lead(II) bromide is electrolysed, lead is made at the cathode. State the product at the anode.
See it on the paper → - 0973/31 · May/June 2023 · Q5c(ii)[3]
Complete the sentences to describe the electrolysis of lead( II ) bromide. Electrolysis is the breakdown of molten lead( II ) bromide by the passage of . The gas released at the positive electrode is and is formed at the negative electrode.
See it on the paper → - 0973/31 · October/November 2022 · Q11f[4]
Fig. 11.1 shows the electrolysis of concentrated aqueous sodium chloride. low voltage d.c. supply – + concentrated aqueous sodium chloride Fig. 11.1 Complete the sentences about the electrolysis of concentrated aqueous sodium chloride. Electrolysis is defined as the breakdown of an ionic compound when or in aqueous sol...
See it on the paper → - 0973/32 · May/June 2022 · Q8c(ii)[2]
State the two products of this electrolysis.
See it on the paper → - 0973/31 · May/June 2021 · Q2e[2]
Fig. 2.1 shows the electrolysis of molten lead( II ) bromide using inert electrodes. low voltage d.c. supply cathode anode – + molten lead(II) bromide Fig. 2.1 Identify the substances formed at the cathode and the anode. at cathode at anode
See it on the paper → - 0973/41 · May/June 2021 · Q8b(i)[1]
A gas is made at the positive electrode. State the name of this gas.
See it on the paper →
What examiners said
Most candidates gave the answer of bromine, but a significant number of candidates gave the answers of bromide, oxygen or lead.
— Examiner report, October/November 2023, 0973/41 Q11(a)(i) (Cambridge)
Most candidates knew that the negative electrode is the cathode. Bromide was not accepted as an alternative to bromine.
— Examiner report, May/June 2023, 0973/31 Q5(c)(ii) (Cambridge)
Many candidates knew that lead and bromine were produced during the electrolysis of molten lead(II) bromide but some candidates were unable to place them at the correct electrodes.
— Examiner report, May/June 2021, 0973/31 Q2(e) (Cambridge)
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