Changing the concentration of the reactants
1 mark · EasyState what happens to the rate of a reaction if the concentration of a reactant is increased, assuming all other conditions remain the same.
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The rate of the reaction increases.
Also accept: Reaction becomes faster.; The reaction goes faster.; The speed of reaction increases.
Common mistakes: Saying only 'there are more collisions' without mentioning 'per second' or 'rate'.
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Marking points
B1 · 1 mark · States that the rate of reaction increases or the reaction is faster when concentration increases.
Worked solution
The rate of reaction increases if the concentration of a reactant is increased.