AS & A Level Chemistry (9701) — May–June 2023, Paper 31
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 17 marks · Practical skills (rates of reaction, recording data)
Quantitative Analysis. The thiosulfate ion, S2O3^2-, decomposes when an acid is added: S2O3^2-(aq) + 2H+(aq) - S(s) + SO2(aq) + H2O(l). The rate of this reaction can be…
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Many salts contain water of crystallisation which can be removed by heating to form the anhydrous salt. You will determine the enthalpy change of dehydration for hydrated…
Answer this question and get it marked →Question 3 · 12 marks · Practical skills (qualitative analysis)
Qualitative analysis. A student finds a container of a compound thought to be FA 3 and labels it FA 5. (FA 5 is in fact ZnSO4.7H2O.) Carry out tests to determine whether your…
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