IGCSE Sciences - Co-Ordinated (0654) — October–November 2023, Paper 53
5 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →You are going to investigate an enzyme controlled reaction. An enzyme found inside living cells of some plants catalyses the breakdown of hydrogen peroxide releasing oxygen gas.…
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 →You are going to determine the percentage purity of a sample of compound F and identify the ions it contains. When compound F is heated it decreases in mass because it gives off a…
Answer this question and get it marked →You are going to investigate the oscillations of a simple pendulum. The period of a pendulum is the time for one complete oscillation. The pendulum is set up as shown in Fig. 4.2…
Answer this question and get it marked →You are going to investigate the cooling of hot water in two beakers, P and Q. Both insulation and a lid each reduce the loss of thermal energy. Beaker P has a layer of insulation…
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