CAIE A Level Chemistry 9701 · Reaction kinetics
A reaction is carried out at 20 °C and again at 30 °C. The rate of reaction increases when the temperature is increased. Describe, in terms of the Boltzmann distribution and of effective collisions, why this increase in temperature causes a large increase in the rate of the 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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