CAIE A Level Chemistry 9701 · States of matter
(a) A sealed flask contains gas at constant temperature. The gas behaves as an ideal gas.
Suggest how the molecules of the gas produce a pressure on the inside of the flask.
(b) A student claims that if the molecules were much larger, the pressure in the flask would be greater, because each molecule would hit the wall with a larger force.
Suggest why this claim is incorrect, referring to the assumptions of an ideal gas.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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