In a closed vessel, a gas is heated from 300K to 600 K. The kinetic energy becomes__________?
Correct answer: A. Double
- A. Double
- B. Same
- C. Half
- D. Four times
Explanation
The average kinetic energy of gas molecules is directly proportional to absolute temperature. Since the temperature changes from 300 K to 600 K, the ratio is 600 K / 300 K = 2, so the kinetic energy becomes double. Students may choose four times by confusing kinetic energy with a quantity proportional to the square of speed.
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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