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Enzymes are biological catalysts. They speed up biological reactions and like enzymes are not used up. They are specific to a certain reaction. I have been asked to design an experiment that investigates one factor that affects the rate of an enzyme. When hydrogen peroxide is placed on liver (the substrate) it froths (makes O2) (H202ÆH20+O2) Possible input variables These are the things that I could vary in my experiment Concentration I predict that the reaction will speed up as the concentration increases. I think the rate will double because the number of hydrogen peroxide atoms in the same volume will double. So there will be twice as much chemical reacting. Because of this there will be twice the chance that a hydrogen peroxide molecule will collide with the substrate and react. This is why I think the rate will increase. The reaction will be over quicker but the same amount of oxygen will be produced. This is because there is more than enough hydrogen peroxide to react...

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