IGCSE Chemistry (0971) — May–June 2025, Paper 61
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A student prepares some crystals of pure potassium sulfate by reacting aqueous potassium carbonate with dilute sulfuric acid. The equation for the reaction is shown. K2CO3(aq) +…
Answer this question and get it marked →A student investigates how the rate of reaction of magnesium ribbon with dilute acid changes as the concentration of the acid is changed. The student uses five solutions of the…
Answer this question and get it marked →A student tests two solids: solid F and solid G. Tests on solid F Solid F is calcium carbonate. The student adds about 15 cm^3 of dilute hydrochloric acid to the sample of solid F…
Answer this question and get it marked →Solid sodium hydrogencarbonate, NaHCO3, reacts with dilute hydrochloric acid and with dilute ethanoic acid. NaHCO3(s) + HCl(aq) - NaCl(aq) + CO2(g) + H2O(l) NaHCO3(s) +…
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