AQA · Physics · 8463
GCSE Physics: Particle motion in gases
Particle model of matter · AQA GCSE Physics (8463), specification point 4.3.3.1. Cards are generated from the exam board's own specification for "Particle motion in gases", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Describe the motion of the molecules in a gas.
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They are in constant random motion.
The molecules of a gas are in constant ? motion.
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random
What property of gas molecules is the temperature of a gas related to?
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The average kinetic energy of the molecules.
The temperature of a gas is related to the ? of its molecules.
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average kinetic energy
What happens to the average kinetic energy of gas molecules when the gas is heated?
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It increases — the molecules move faster on average.
What causes a gas to exert pressure on the walls of its container?
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The molecules collide with the walls, exerting a force on them; the total force per unit area is the pressure.
At constant volume, what happens to the pressure of a gas if its temperature increases?
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The pressure increases.
Why does the pressure of a gas at constant volume rise when it is heated?
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The molecules move faster, so they hit the container walls more often and with more force, increasing the force per unit area.
At constant volume, what happens to the pressure of a gas if it is cooled?
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The pressure decreases, because the slower molecules collide with the walls less often and less forcefully.
Which quantity must be held constant for a gas's pressure to depend only on its temperature?
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Its volume.
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