MCAT General Chemistry Question 206: Answer and Explanation
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Question: 206
4. Denver is at a higher altitude than Los Angeles and therefore the atmospheric pressure is lower in Denver than in Los Angeles. Compared to Los Angeles, the melting point of water in Denver will be:
- A. higher.
- B. lower.
- C. the same.
- D. undetermined from the information given.
Correct Answer: A
Explanation:
A On a P vs. T phase diagram of water, the solid-liquid equilibrium line has a negative slope for water. Water's melting point increases with decreasing external pressure. Therefore, in Denver the melting point of water is higher than in Los Angeles.