0654.C9.5.05 — Explain sacrificial protection in terms of the reactivity series and in terms of electron loss: past paper questions
Real questions on 0654.c9.5.05 — explain sacrificial protection in terms of the reactivity series and in terms of electron loss
The newest 12 of 12 written questions. Open one to see it on the real paper.
- 0654/02 · Specimen 2025 · Q23[1]
Which statement describes and explains the sacrificial protection of iron?
See it on the paper → - 0654/31 · May/June 2025 · Q7b[2]
Iron rusts. Complete the sentence. The conditions required for the rusting of iron include the presence of
See it on the paper → - 0654/31 · May/June 2025 · Q7c(i)[1]
Explain why the sentence above suggests that iron is a transition metal.
See it on the paper → - 0654/31 · May/June 2025 · Q7c(ii)[2]
Complete the balanced symbol equation for the reaction between iron and dilute hydrochloric acid. FeCl 2 (…) + H 2 (…) Fe (s) + … HCl (aq) Include state symbols.
See it on the paper → - 0654/31 · May/June 2025 · Q7d[1]
Iron is a good thermal conductor and a good electrical conductor. State one other general physical property of iron that is characteristic of most metals.
See it on the paper → - 0654/31 · May/June 2025 · Q8a(i)[1]
State the name of one other fossil fuel.
See it on the paper → - 0654/31 · May/June 2025 · Q8a(ii)[1]
State the name of the main compound present in natural gas.
See it on the paper → - 0654/31 · May/June 2025 · Q8b(i)[1]
State the name of the process shown in Fig. 8.1. (i)
See it on the paper → - 0654/31 · May/June 2025 · Q8b(ii)[1]
Explain why the process identified in (b)(i) is a physical change and not a chemical change.
See it on the paper → - 0654/31 · May/June 2025 · Q8b(iii)[1]
State one use for bitumen.
See it on the paper → - 0654/31 · May/June 2025 · Q8c(i)[2]
Explain why octane is a hydrocarbon.
See it on the paper → - 0654/41 · May/June 2025 · Q7e[2]
Iron is protected from rusting by coating the iron with a layer of zinc. This is called sacrificial protection. Explain how sacrificial protection protects iron. Use ideas about the reactivity series and loss of electrons.
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What examiners said
This question was well answered. Some candidates only got one mark because they suggested hydrogen or carbon dioxide as the other condition.
— Examiner report, May/June 2025, 0654/31 Q7(b) (Cambridge)
Candidates didn’t link the formation of a coloured compound to iron’s status as a transition metal. They merely described the reaction or restated iron’s reaction with hydrochloric acid as evidence.
— Examiner report, May/June 2025, 0654/31 Q7(c)(i) (Cambridge)
Candidates were usually able to balance the equation but often gave iron chloride a solid state symbol. Occasionally, hydrogen received similar treatment but candidates more often knew this was a gas. Candidates should be encouraged to carefully read the question to determine the state of the products.
— Examiner report, May/June 2025, 0654/31 Q7(c)(ii) (Cambridge)
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