Phase Changes

Question 2 • Chemistry Honors A

Which best explains the relationship between evaporation and temperature?

Answer

A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid’s surface.

A liquid evaporates faster at lower temperatures because the attractions are decreased and more particles can escape the surface of the liquid.

A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, so fewer molecules can escape the surface.

A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Explanation

As temperature rises, the liquid’s molecules have more kinetic energy and move faster. More molecules can overcome the attractive forces holding them in the liquid and escape from its surface, so evaporation speeds up. Choice D describes this relationship.

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