O-LevelPhysicsThermal Physics5054/11 · May/June 2021 · Q191 Mark
Which statement about water is correct?
AAt the boiling point, water vapour molecules have the same kinetic energy as liquid water
molecules.
BEvaporation occurs only at the boiling point.
CWater molecules become heavier when water freezes.
DWater molecules lose all of their kinetic energy when water freezes.
✓ Correct answer
A: At the boiling point, water vapour molecules have the same kinetic energy as liquid water molecules.
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