AP Chemistry Question 460: Answer and Explanation

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Question: 460

3. If one of the containers sprang a small leak, which of the following would change?

  • A. Moles, temperature, and pressure
  • B. Moles and pressure
  • C. Temperature and pressure
  • D. Moles and temperature

Correct Answer: A


A-Escaping gas would decrease the number of moles. Less gas remaining in the container would mean less pressure. The faster moving gas molecules would escape faster, lower the average velocity of those remaining in the container. A lower average velocity means a lower temperature.