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Edexcel ·Chemistry·Cambridge AS & A Level Chemistry

States of Matter

14 min read

The ideal gas, kinetic theory and real-gas deviations, the three states, and giant and simple lattice structures with their properties.

The kinetic theory and the ideal gas

An ideal gas is assumed to consist of point particles in random motion, with no intermolecular forces and elastic collisions; its behaviour obeys pV=nRTpV = nRTpV=nRT. Real gases deviate most at high pressure and low temperature, because molecules are then close together so their volume is no longer negligible and intermolecular forces matter. Gases behave most ideally at low pressure and high temperature.

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