MCAT General Chemistry Question 124: Answer and Explanation
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Question: 124
4. Which of the following explanations best describes the mechanism by which solute particles affect the melting point of ice?
- A. Melting point is elevated because the kinetic energy of the substance increases.
- B. Melting point is elevated because the kinetic energy of the substance decreases.
- C. Melting point is depressed because solute particles interfere with lattice formation.
- D. Melting point is depressed because solute particles enhance lattice formation.
Correct Answer: C
Explanation:
Melting point depresses upon solute addition, making choices (A) and (B) incorrect. Solute particles interfere with lattice formation, the highly organized state in which solid molecules align themselves. Colder-than-normal conditions are necessary to create the solid structure.