MCAT Physical : Phase Changes

Study concepts, example questions & explanations for MCAT Physical

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Example Questions

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Example Question #2 : States Of Matter

Which of the following describes the concept of sweating?

Possible Answers:

Sweating results in increased body temperature because evaporation is endothermic

Sweating results in a decreased body temperature because evaporation is endothermic

Sweating results in decreased body temperature because evaporation is exothermic

Sweating results in increased body temperature because evaporation is exothermic

Correct answer:

Sweating results in a decreased body temperature because evaporation is endothermic

Explanation:

Sweating reduces skin temperature because the sweat that is secreted to the skin evaporates, which is an endothermic process. Thus, heat is absorbed from the body and skin to drive the evaporation of the sweat on the skin.

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