MCAT General Chemistry Question 267: Answer and Explanation
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Question: 267
4. Sublimation of water inside the sample chamber causes the temperature of the chamber to:
- A. increase.
- B. decrease.
- C. stay the same.
- D. change in a manner dependent on the identity of the solvent.
Correct Answer: B
Explanation:
B Sublimation is an endothermic reaction, requiring heat input. As this reaction removes heat from the surroundings, it lowers the temperature of the surroundings, in this case, the reaction chamber. This is very similar to sweat cooling the body as it evaporates off of the skin (also an endothermic process).