alleryStart learning →Kinetic molecular theory explains Boyle's law by which change when the volume of a gas decreases?
AMolecules lose kinetic energy quickly
BWall collisions become more frequent
CMolecules begin to attract each other
DThe average molecular speed increases
Answer & Solution
Correct answer: B. Wall collisions become more frequent
1. Squeezing a gas into a smaller space shortens the distance a molecule travels before it meets a wall.
2. Collisions with the walls therefore happen more often, and the wall area they are spread over has also shrunk.
3. Both effects push the pressure up, which is exactly what Boyle's law records.
4. The temperature has not changed, so the average speed and kinetic energy of the molecules stay the same throughout.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.5 The Kinetic-Molecular Theory_
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