Paper 2 · ideal and real gases

For a gas which behaves ideally, a graph of $pV$ against $p$ at constant temperature is

Aa horizontal straight line

Ba straight line through the origin

Ca curve which passes through a minimum

Da curve which rises steeply at low pressure

Explanation: For an ideal gas

pV = nRT

, so at constant temperature

pV

is constant and independent of pressure.

Derived from ZIMSEC Chemistry Paper 2, November 2005, Q1

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