Physics 5054 · O Level · Melting, boiling and evaporation

Melting, boiling and evaporation — practice question

A container of liquid is left on a laboratory bench. Part of the liquid evaporates. What occurs, and what is the reason for it?

  • AThe liquid cools because liquid molecules have more potential energy than gas molecules.
  • BThe liquid cools because faster-moving molecules escape.
  • CThe liquid warms because liquid molecules have less potential energy than gas molecules.
  • DThe liquid warms because slower-moving molecules are left behind.

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