Cambridge Science – States Of Matter Practice Test

Which phase change corresponds to fusion?

Liquid to gas Gas to solid Solid to liquid Solid to gas

Correct Answer:

Solid to liquid

Explanation:

Fusion is the melting process: a solid absorbs heat and becomes a liquid. At the melting point, the particles gain enough energy to overcome some of the forces holding them in a rigid, fixed arrangement, so they can move past each other and form a liquid. A familiar example is ice turning into water as it warms. So, the phase change where a solid becomes a liquid is fusion. Other transitions involve different changes: liquid turning into gas is vaporization, solid turning into gas is sublimation, and gas turning into solid is deposition (the reverse of sublimation).

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