IGCSE Chemistry (0971) — October–November 2023, Paper 62
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Some seashells contain a mixture of the insoluble compounds calcium carbonate and silicon(IV) oxide only. Calcium carbonate reacts with dilute hydrochloric acid to form the…
Answer this question and get it marked →A student investigates the temperature change when aqueous sodium hydroxide neutralises dilute hydrochloric acid: NaOH + HCl - NaCl + H2O. In six experiments the student mixes…
Answer this question and get it marked →A student tests two substances: solid K and solid L. The student dissolves solid K in water to form solution K and divides it into four portions. Table 3.1 shows tests on solution…
Answer this question and get it marked →The solubility of solid sodium sulfate in water changes as the temperature of the water changes. Plan an experiment to find out how the solubility of sodium sulfate in water…
Answer this question and get it marked →