May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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2Particle Model Changes StateEasy1 mark
X and Y are changes of state of water.
equilibrium diagram: ice reversibly changes to liquid water via process X, and liquid water reversibly changes to water vapour via process Y
Which row identifies X and Y?
XY
Afreezingboiling
Bfreezingcondensing
Cmeltingboiling
Dmeltingcondensing