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Investigating what affects the rate of reaction of Catalase and potato.

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Introduction

Investigating what affects the rate of reaction of Catalase and potato Aim: To investigate the effect that surface area of a potato has on the rate of reaction between the Catalase and potatoes. Hypothesis: An enzyme is something that is used to break down larger molecules into smaller ones. Enzymes can be found in all living things, and they act like catalysts to speed up the process of decomposition of the large molecules. The enzyme Catalase is found in many living tissues including potato cells. Catalase breaks down hydrogen peroxide solution into water and oxygen gas. If we place a piece of potato into a solution of Hydrogen Peroxide the Catalase in the potato will react with the Hydrogen Peroxide and cause it to break down into the oxygen bubbles and water. ...read more.

Middle

* Scalpel * Test Tubes * Measuring Cylinder * Potato * Hydrogen Peroxide * Delivery tube Potato Hydrogen Peroxide The below diagram shows how the apparatus should be set up: Delivery tube Bung Potato Test Tube Oxygen Bubbles Method: First I will take a potato and cut it into 5 equal cylinders. I will then cut one of these into 2 equal pieces, another into 3 pieces, another into 4 pieces and one I will leave whole. I will fill a test tube up with water, then I will put 50cm� of Hydrogen Peroxide into another. I will put the first potato into the Hydrogen Peroxide, and then put a delivery tube from the water to the potato. ...read more.

Conclusion

This results in more Catalase reacting with the Hydrogen Peroxide. As they react together, oxygen is made and this is released in the bubbles I counted in the second tube. There were no anomalous results and they results we got were fairly accurate. Evaluation: The experiment was not carried out to be totally exact. When cutting then pieces of potato, it was only accurate to our eyes, and to a ruler, and then it was only 1mm. We could have used a more accurate device to measure the potato. We could also have investigated other things that affect the rate of reaction, such as temperature, concentration of the reactants, and the use of a catalyst. This would have given me a larger understanding of the rate of reaction. ...read more.

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