Question

particles of a certain state of matter undergo a phase change. before the change, the substance does not have a definite shape but does have a definite volume. after the change, the substances particles become closely packed together. the substance undergoes:
a condensation
b melting
c evaporation
d distillation
e freezing

Explanation:

• Condensation: Gas to liquid. Gas has no definite shape or volume. Liquid has definite volume but no definite shape. This is not the case here as after change particles are closely packed (solid - like in freezing).
• Melting: Solid to liquid. Solid has definite shape and volume. Liquid has definite volume but no definite shape. Opposite of what is described (from liquid - like to solid - like).
• Evaporation: Liquid to gas. Liquid has definite volume but no definite shape. Gas has no definite shape or volume. Opposite of what is described (from liquid - like to gas - like).
• Distillation: A separation process, not a phase change in the sense of solid - liquid - gas phase change as described in the problem.
• Freezing: Liquid to solid. Liquid has no definite shape but definite volume. Solid has particles closely packed (definite shape and volume). Matches the description in the problem.

Answer:

e. Freezing