CCEA GCSE Science Single Award Practice Questions - CCEA GCSE Science - Single Award (2017) (Northern Ireland) Exam

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A student burns a food sample under a boiling tube of water to estimate energy content (prescribed practical B2). Energy transferred to the water is calculated using temperature rise of a known mass of water. Which change would improve reliability of the comparison between two foods?

Use different starting water temperatures for each food without recording them Repeat the burns and calculate a mean temperature rise for each food Ignore any heat loss and never mention it in evaluation Burn only one tiny crumb of one food and one whole biscuit of the other

Correct Answer:

Repeat the burns and calculate a mean temperature rise for each food

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