CAIE A Level Chemistry 9701 · States of matter
A cyclist pumps more air into a bicycle tyre, keeping the temperature of the air constant. Describe, in terms of the kinetic theory of gases, how the pressure exerted by the air on the inside of the tyre arises and why this pressure increases as more air is pumped in. State the two assumptions of the kinetic theory that apply to an ideal gas.
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.