All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #2 : Physical Chemistry
Which of the following reactions has a positive value for change in entropy ?
Possible Answers:
Water evaporates into water vapor
Water freezing into ice
A salt precipitates out of a saturated solution
Correct answer:
Water evaporates into water vapor
Explanation:
Entropy is a measure of the disorder of a system. In other words, when the components of a system become more uniform and spread out, the entropy of the system has increased. For example, when a liquid becomes gaseous, the molecules separate from one another, increasing the disorder of the system. As a result, the evaporation of water results in an increase in entropy.
All other options result in a more ordered system, which decreases entropy.
Gregory
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Pennsylvania State University-Main Campus, Bachelor of Science, Chemical Engineering. Carnegie Mellon University, Doctor of P...
Yongmao
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Nankai University, Bachelor of Science, Chemistry. Washington University in St Louis, Doctor of Philosophy, Organic Chemistry.
All GRE Subject Test: Chemistry Resources
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