A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2025 · Q101 Mark

One commercially available 'heat pad' contains iron, activated carbon and water. The 'heat pad' is activated by air. This causes the pad to get hotter. Which statement describes the chemical reaction occurring in the 'heat pad' when it is exposed to air?

AThe reaction is endothermic and iron gains electrons.

BThe reaction is endothermic and iron loses electrons.

CThe reaction is exothermic and iron gains electrons.

DThe reaction is exothermic and iron loses electrons.

✓ Correct answer

D: The reaction is exothermic and iron loses electrons.

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2025 Paper 1 Variant 2, question 10.

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