May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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15Latent Heat Changes StateHard1 mark
A student uses a tall container and a shallow dish for two experiments heating water. The same mass of water at room temperature is used in each experiment. The tall container is heated until the water boils and the shallow dish is kept warm at a constant temperature with a fan blowing across it.
two setups side by side: a tall container of water heated from below until it boils, and a shallow dish of water sitting in a warm constant-temperature bath with a fan blowing air across its surface
Which row shows the correct graph for the mass of water remaining in each experiment?
table of four options, each a pair of mass-against-time graphs for the tall container and the shallow dish: A both fall in a straight line to zero, the dish more slowly; B the container falls in a straight line to zero, the dish falls then levels off before dropping to zero; C the container falls only slightly, the dish falls in a straight line to zero; D the container falls then levels off before dropping to zero, the dish falls in a straight line to zero