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A2 · Topic 15

The behaviour of an ideal gas.

Counting particles by the mole, the equation of state pV = nRT, and the kinetic theory that connects pressure and temperature to the motion of molecules. Play the three simulations below. The gamified lessons and the topic Paper 4 practice are live below too.

Simulations · live
Interactive · live The mole and the Avogadro constant Amount of substance in moles, the particle number N = nN₊, and the mass of a sample. Loads only when you launch, so the page stays fast.
Interactive · live The gas laws and pV = nRT Squeeze and heat a fixed mass of gas and watch the pressure follow the equation of state. Loads only when you launch, so the page stays fast.
Interactive · live Kinetic theory of gases Pressure built from molecular collisions, with the mean translational kinetic energy set by temperature. Loads only when you launch, so the page stays fast.
Paper 4 practice · live
Structured questions · with worked solutions Ten original Paper 4 style questions A full topic set across the mole, the equation of state, and the kinetic theory, with several questions linking lessons within the topic and full worked solutions. Open practice →
Lessons · live
The mole → The equation of state → Kinetic theory of gases →
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