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AP® Chemistry

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Moderate

Condensation

APCHEM-LDWKEN

A gas condenses to a liquid at its boiling point at constant pressure.

Which of the following BEST describes this process?

A

The process is exothermic; work is done on the system.

B

The process is endothermic; work is done on the system.

C

The process is exothermic; work is done by the system.

D

Work is done on the system, but the process takes place at a constant temperature, so it is neither exothermic nor endothermic.