AS & A Level Chemistry (9701) — May–June 2024, 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 · 13 marks · Practical skills (calorimetry — recording results)
In this experiment you will determine the enthalpy change, ΔHr, for the reaction shown. NaOH(aq) + CO2(g) → NaHCO3(aq) enthalpy change = ΔHr You will react each of sodium…
Answer this question and get it marked →Question 2 · 14 marks · Practical skills (titration — recording results)
Sodium sulfite is oxidised when it reacts with excess iodine. Na2SO3(aq) + I2(aq) + H2O(l) → Na2SO4(aq) + 2HI(aq) The remaining iodine is then titrated using aqueous sodium…
Answer this question and get it marked →Question 3 · 13 marks · Practical skills (qualitative analysis — identifying solutions)
FA 7, FA 8 and FA 9 are dilute ethanoic acid, dilute hydrochloric acid and aqueous silver nitrate but not necessarily in that order. The solutions of acids have equal…
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