... that was added, the more oxygen was given off. This leads me to think that the 'quantitative prediction', is true, so the amount of catalase added and the amount of oxygen given off is directly proportional. So, the more catalase molecules there are, the more chance of a reaction with the hydrogen peroxide, so therefore it is directly proportional. This is the collision theory. So, when I double the amount of catalase added, I will double the amount of oxygen produced. Inevitably, the graph will come to an end for all the oxygen molecules have been reacted with so there will be nothing else left to react which brings the end of the graph to a halt. This is due to the lock and key theory, when all the hydrogen peroxide has been reacted with, for the enzymes act as a lock and the hydrogen peroxide as a key. Once ...

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