IGCSE Sciences - Co-Ordinated (0654) — May–June 2023, Paper 61
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A student investigates the use of an enzyme for extracting juice from apples. Apple puree is treated with enzyme solution (beaker A) or water (beaker B), stirred, left in a warm…
Answer this question and get it marked →The student tests apple juice for nutrient content. The apple juice tests positive with Benedict's solution and negative with biuret solution. Record in Table 2.1 the final…
Answer this question and get it marked →A student investigates the rate of reaction between solutions H and K (with starch, blue-black colour appears after a time). Experiment 1: 10 cm3 H, 5 drops starch, 2 cm3…
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 →A student investigates the stretching of a spring (Fig. 5.1). Fig. 5.2 shows a full-size diagram of the unstretched spring and part of the metre rule (scale 32–36 cm). Take…
Answer this question and get it marked →A student investigates the cooling of hot water in a beaker. Room temperature is 22.0 °C; 200 cm3 of hot water is poured into a beaker, a thermometer placed in, wait 30 s, stir…
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