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Praxis II Physics Content Knowledge Exam Prep

Category - Praxis II Physics Content Knowledge Test Prep

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Two full 2 L bottles of water are placed on a table. Bottle 1 was just removed from a refrigerator; bottle 2 is at room temperature.

Which of the following statements describes the average molecular kinetic energy and the speed of the molecules in each bottle?
  1. Bottle 1 has the same average molecular kinetic energy as
    bottle 2, and the molecules have the same average speed in both bottles.
  2. Bottle 1 has a smaller average molecular kinetic energy than
    bottle 2, and the molecules have the same average speed in both bottles.
  3. Bottle 1 has a smaller average molecular kinetic energy than
    bottle 2, and the molecules have a slower average speed in bottle 1 than in bottle 2.
  4. Bottle 1 has a larger average molecular kinetic energy than
    bottle 2, and the molecules have a slower average speed in bottle 1 than in bottle 2.
Explanation
Answer: C - Bottle 1 has a smaller average molecular kinetic energy than bottle 2, and the molecules have a slower average speed in bottle 1 than in bottle 2.
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