IGCSE Chemistry (0620) — 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). Six experiments mix dilute hydrochloric…
Answer this question and get it marked →A student tests two substances: solid K and solid L. Solid K is dissolved in water to form solution K, divided into four portions. Table 3.1 shows the tests and observations for…
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…
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