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AssignmentMultiple Select

Phase Changes

Question 1 • IA-Chemistry A Survey of Chemistry A

Which statements describe phase changes? Check all that apply.

Answer
A
Particles in a liquid need to move more slowly in order to freeze.
B
Attractive forces overcome the motion of particles when a solid sublimes.
C
Attractive forces between the particles in a liquid are broken when a liquid boils.
D
Particles in gas move fast enough to make more attractive forces when the gas condenses.

Explanation

Freezing happens as liquid particles lose kinetic energy and move more slowly, allowing them to settle into fixed positions, so A is correct. When a liquid boils, its particles gain enough energy to overcome the attractive forces holding them close together, so C is correct. During sublimation, particle motion overcomes attractions; during condensation, gas particles slow down so existing attractions can pull them closer together. Neither process creates more attractive forces, so B and D are incorrect.

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