IGCSE Sciences - Co-Ordinated (0654) — October–November 2023, Paper 63
5 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A student investigates an enzyme-controlled reaction. An enzyme found inside living cells of some plants catalyses the breakdown of hydrogen peroxide, releasing oxygen gas, which…
Answer this question and get it marked →Amylase is a digestive enzyme that breaks down starch into sugars. The presence of starch in a solution is confirmed by adding iodine solution. When starch is present, the iodine…
Answer this question and get it marked →A student determines the percentage purity of a sample of compound F and identifies the ions it contains. When compound F is heated it decreases in mass as it gives off a gas.…
Answer this question and get it marked →A student investigates the oscillations of a simple pendulum. The student sets up a pendulum as shown in Fig. 4.1 (clamp on a stand, length l from the point of support to the…
Answer this question and get it marked →A student investigates the cooling of hot water in two beakers, P and Q. Beaker P has a layer of insulation but no lid; beaker Q has a lid but no insulation. Procedure: measure…
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