Mark the chemistry answer
Read the candidate's answer and decide how many marks you'd give it. Then compare your reasoning with mine.
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Candidate's answer
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About the marking
These are original practice questions for AQA and OCR A. The mark allocations belong to these questions; actual exam schemes vary with the wording. The explanations were checked against published board specifications and mark schemes on 17 October 2026. Each required point must be supported by the candidate’s answer. A directly contradictory statement loses the affected mark. An unrelated error is identified even when it does not cancel a mark.
Find the official papers and schemes on LearnFaster: AQA AS, AQA A-level, OCR A AS and OCR A A-level.