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Investigating the effect of substrate concentration on the rate of an enzyme controlled reaction Aim: to find the effect substrate concentration has on the rate of reaction of an enzyme controlled reaction. I have decided to measure the rate of reaction of the break down of hydrogen peroxide when using catalase. I have decided to use this reaction for the following reasons: from preliminary work I found that this reaction occurs at a speed suitable for measuring with the equipment available at school. This experiment is also suitable as I am familiar with it from doing similar experiments in GCSE biology. Introduction Enzymes have the ability to catalyse an experiment, for this reason they are often used to speed up reactions which don't go fast enough naturally. It speeds up a reaction by lowering the activation energy(Ea) thus meaning more collisions between reactants result in successful reactions taking place: This diagram shows that by adding...

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