The newest 6 of 6 written questions. Open one to see it on the real paper.
Explain how the equation shows that oxidation takes place.
See it on the paper →Explain why equation 1 shows that iron is oxidised.
See it on the paper →Use the equation to explain why this reaction is a redox reaction. (ii)
See it on the paper →A word equation for the rusting of iron is shown. iron + oxygen + water hydrated iron( III ) oxide Explain why rusting is described as an oxidation reaction.
See it on the paper →Complete the word equation for the reaction between carbon and copper oxide. copper + +
See it on the paper →State the type of chemical reaction that occurs when zinc loses oxygen.
See it on the paper →Candidates found this question demanding. The definition of oxidation at this level is the gain of oxygen by a substance, in this case iron. Answers had to point out clearly that the oxygen has combined with the iron. An example of a correct answer is ‘the iron has combined/reacted with oxygen’. Vague answers such as ‘because it shows it in the equation’ or ‘because it gains oxygen’ were not accep...
— Examiner report, May/June 2025, 0653/31 Q4(c)(ii) (Cambridge)
The best answers stated that iron is oxidised because it gains oxygen or explained that the iron has combined with the oxygen. Candidates found this question demanding.
— Examiner report, May/June 2025, 0653/33 Q6(d) (Cambridge)
The meanings of oxidation, reduction and redox were generally familiar to candidates and at least partial credit was very frequently awarded. The question asked candidates to make use of the equation and so they needed to describe details of oxygen loss and gain. Answers correctly describing the loss and gain of electrons were accepted.
— Examiner report, February/March 2025, 0653/42 Q5(a)(ii) (Cambridge)
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