IGCSE Sciences - Co-Ordinated (0654) — May–June 2023, Paper 51
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →You investigate the use of an enzyme for extracting juice from apples. Apple puree is treated with enzyme solution (beaker A) or warm water (beaker B), then filtered into…
Answer this question and get it marked →You test some of the apple juice from Question 1 for its nutrient content. Test 1 cm depth of apple juice with Benedict's solution in a hot water-bath for 3 minutes; test another…
Answer this question and get it marked →You investigate the rate of reaction between solutions K and H. When K, H and starch are mixed, a blue-black colour appears after a time. Experiment 1: add 10 cm3 K, 5 drops…
Answer this question and get it marked →Aqueous hydrogen peroxide breaks down slowly into water and oxygen gas; manganese(IV) oxide is a catalyst. The reaction is too fast to count the bubbles of gas formed. Plan an…
Answer this question and get it marked →You investigate the stretching of a spring (Fig. 5.1, spring hung from a clamp with a metre rule). Take readings from the metre rule of the top and the bottom of the coiled part…
Answer this question and get it marked →You investigate the cooling of hot water in a beaker. Pour 200 cm3 of hot water into the beaker, place the thermometer in, wait 30 seconds, then measure the initial temperature T.…
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