Chemistry / Unit 7 Chem 1311 worked example, 60 to 90 seconds
Explaining the Gas Laws from Kinetic-Molecular Theory
The idea
Explaining a gas law from kinetic-molecular theory means tracing how a change in temperature, volume, or amount alters the frequency and force of particle-wall collisions, and showing that this traced change reproduces the law's already-known pressure, volume, or temperature relationship.
In practice
Raising temperature at constant volume speeds the particles, so they strike the walls harder and more often, raising pressure — reproducing Amontons's law. Compressing the same amount of gas into a smaller volume at constant temperature exposes the walls to more frequent collisions without changing their force, raising pressure — reproducing Boyle's law. Adding more particles at constant temperature and pressure requires more volume to keep the collision frequency per wall area unchanged — reproducing Avogadro's law.
Where people slip
Treating kinetic-molecular theory as a fifth, independent gas law, rather than the mechanism behind the first four, skips the entire point of building this model after them, not before.
Your place on the trail
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