IGCSE Chemistry (0620) — May–June 2025, Paper 51
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 · Acids, bases and salts / Rate of reaction (practical skills)
You are going to investigate how the rate of reaction of magnesium ribbon with dilute acid changes as the concentration of the acid is changed. You will use five solutions of the…
Answer this question and get it marked →Question 2 · 15 marks · Qualitative analysis (reactions of carbonates / gas tests)
Tests on solid F. To the boiling tube containing solid F, add about 15 cm3 of dilute hydrochloric acid. Test any gas produced. Keep the product for use in (b). Record your…
Answer this question and get it marked →Question 3 · 6 marks · Energetics / Planning an investigation (endothermic reactions)
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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