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O-LevelChemistryAtomic Structure5070/11 · Oct/Nov 2020 · Q71 Mark

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.

✓ Correct answer

D: The gas particles move more slowly so reducing the pressure.

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About this question

Topic
Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 1, question 7.

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