AS & A Level Chemistry (9701) — October–November 2023, Paper 36
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 12 marks · Advanced practical skills (recording mass data; decomposition of hydrogen peroxide)
When hydrogen peroxide is decomposed by a suitable catalyst, oxygen and water are produced. You will determine the concentration of a solution of hydrogen peroxide by decomposing…
Answer this question and get it marked →Question 2 · 14 marks · Advanced practical skills (redox titration; recording burette readings)
The concentration of a solution of hydrogen peroxide can also be determined by titration with acidified potassium manganate(VII): 2MnO₄⁻(aq) + 5H₂O₂(aq) + 6H⁺(aq) → 2Mn²⁺(aq) +…
Answer this question and get it marked →Question 3 · 14 marks · Qualitative analysis (reaction of thiosulfate with acid)
FB 6 is a solution containing one cation and one anion; the anion is listed in the Qualitative analysis notes. FB 7 is aqueous sodium thiosulfate, Na₂S₂O₃. To a 1 cm depth of FB 7…
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