CAIE A Level Chemistry 9701 · Reaction kinetics
A reaction between two gases, and , takes place in a sealed flask at constant temperature. The rate of the reaction increases when the total pressure in the flask is increased. With reference to collisions, describe why increasing the pressure increases the rate of this reaction.
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.
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