IGCSE Science - Combined (0653) — May–June 2025, Paper 63
4 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 effect of oxygen concentration on the germination of pea seeds. The student assembles the apparatus shown in Fig. 1.2 and leaves the five flasks for…
Answer this question and get it marked →A student investigates a white solid H. The student adds a sample of H to aqueous sodium hydroxide in a boiling tube. The student carefully warms the boiling tube. The student…
Answer this question and get it marked →Aqueous ammonium carbonate reacts with aqueous barium nitrate to form a white precipitate of barium carbonate. aqueous ammonium carbonate + aqueous barium nitrate - barium…
Answer this question and get it marked →A student investigates the rate of cooling of hot water in two glass beakers P and Q. Each beaker has a circular open top with a different diameter. Fig. 4.1 shows the water in…
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