CAIE A Level Chemistry 9701 · States of matter
A sample of carbon dioxide, , is compressed to a high pressure. Describe how the pressure exerted by a gas arises from the motion of its molecules. Use the kinetic theory to describe why , a real gas, deviates from ideal gas behaviour at high pressure.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.