The pressure exerted by a gas on the walls of its container is caused by
Correct answer: B. collisions of the molecules with the walls
- A. the weight of the gas molecules
- B. collisions of the molecules with the walls
- C. attraction between molecules and the walls
- D. the chemical reaction of the gas with the walls
Explanation
Each collision delivers a small impulse, and the enormous number of collisions per second averages out into a steady pressure. Raising the temperature makes the molecules strike harder and more often, which is why pressure rises with temperature at constant volume. Weight contributes negligibly at ordinary scales.
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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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