Boyle's law
2 marks · EasyExplain, using the particle model, why the pressure of a gas increases if it is compressed into a smaller volume at constant temperature.
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Common mistakes: Not mentioning collisions; Saying particles move faster with no temperature change
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Marking points
M1 · 1 mark · States particles hit the walls or collide with container
M2 · 1 mark · Explains more frequent collisions or greater force per area
Worked solution
When the gas is compressed, there is less space, so gas particles hit the walls more often. This increased collision frequency increases the pressure.