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To investigate one of the variables to show its effect on the rate of the reaction.
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GCSE Practical Assessment: Biology Investigation Aim: To investigate one of these variables to show its effect on the rate of the following reaction: Variables to choose between: 1. The concentration of the substrate molecule (H2O2) 2. The mass of the potato (indirect way of measuring the concentration of the enzyme) The Reaction: Hydrogen Peroxide Water + Oxygen 2H2O2 2H20 + O2 For this experiment I have decided to vary the concentration of the substrate molecule (H2O2) Background information: Hydrogen Peroxide is a toxic chemical, produced by many living organisms as a product of the biochemical reactions occurring in the cells. As hydrogen peroxide is poisonous it must be removed quickly. The enzyme Catalase speeds up the reaction that breaks down hydrogen peroxide into water and oxygen. Catalase can be found in potato cells. When hydrogen peroxide is added to the potato as a liquid, the catalase in the potato breaks down the hydrogen peroxide into water and oxygen - two substances...
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