CAIE A Level Chemistry 9701 · States of matter
A bicycle tyre is inflated with air and then left parked.
Describe, in terms of the kinetic theory, how the air inside the tyre exerts a pressure on the walls of the tyre.
Describe the assumptions made about the particles of a gas in the ideal gas model.
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.