AP Chemistry Question 223: Answer and Explanation

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Question: 223

5. Which of the following is not a good measure of relative intermolecular attractive forces?

  • A. Heat of fusion
  • B. Boiling points
  • C. Vapor pressures
  • D. Heat of vaporization

Correct Answer: A


(A) The heat of fusion is the energy needed to disrupt the crystal lattice but not completely separate the molecules. The remaining attractive forces may be significant. (B), (C), and (D) all involve vaporizing the liquid and indicate the total attractive force. Surface tension is similar to vaporization except that one side of the system is vapor and the other the liquid and the resulting forces are related to intermolecular attractive forces.