Chemistry · Oct / Nov 2025 · Paper 12 · Question 2
Why does a balloon full of helium gas become smaller as the temperature changes from 30 °C to 10 °C?
- AThe gas condenses to a liquid and so takes up less space.
- BThe gas particles become smaller at lower temperatures.
- CThe gas particles diffuse through the balloon and escape.
- DThe gas particles move more slowly so reducing the pressure.
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Correct answer: D. The gas particles move more slowly so reducing the pressure.
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