The diffusion of gases at absolute zero will be________________?
Correct answer: D. Zero
- A. Unchanged
- B. Slightly decreased
- C. Slightly increased
- D. Zero
Explanation
According to the classical kinetic theory, gas diffusion depends on random molecular motion, and the average kinetic energy is proportional to absolute temperature. At 0 K, the idealized thermal motion becomes zero, so diffusion is taken as zero. Students may choose b by imagining that diffusion merely slows down at very low temperature rather than stopping in the textbook model.
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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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