IGCSE Chemistry (0620) — May–June 2025, Paper 53
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 19 marks · Rate of reaction (effect of concentration); experimental skills and investigations - recording observations
Complete Table 1.1. Table 1.1 has columns: experiment volume of aqueous sodium thiosulfate / cm^3 volume of distilled water / cm^3 volume of dilute hydrochloric acid / cm^3 time…
Answer this question and get it marked →Question 2 · 15 marks · Acids, bases and salts / qualitative analysis - reactions of aluminium ions; experimental skills and investigations
Tests on solid L. To the first portion of solution L in a boiling tube, add about 2 cm depth of aqueous sodium carbonate. Record your observations.
Answer this question and get it marked →Question 3 · 6 marks · Acids, bases and salts - preparation of an insoluble salt by precipitation; experimental skills and investigations (planning)
Lead(II) chloride, PbCl2, is an insoluble salt. Solid lead(II) chloride can be made by reacting aqueous sodium chloride with aqueous lead(II) nitrate. 2NaCl(aq) + Pb(NO3)2(aq) -…
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