CAIE A Level Chemistry 9701 · States of matter
A student says that the pressure exerted by the air inside a bicycle tyre comes from air molecules colliding with each other.
Describe how the air in the tyre exerts pressure on the tyre walls.
Describe what is meant by an ideal gas having zero particle volume and no intermolecular forces of attraction.
6 marks, so the mark scheme is looking for about 6 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.