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To find how the rate of reaction/rate of decomposition is affected by the concentration of hydrogen peroxide. Liver will be used as a source of catalase, used as a catalyst.

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BIOLOGY INVESTIGATION PLAN- INVESTIGATING THE DECOMPOSITION OF HYDROGEN PEROXIDE Aim: To find how the rate of reaction/rate of decomposition is affected by the concentration of hydrogen peroxide. Liver will be used as a source of catalase, used as a catalyst. Diagram: Hypothesis: Hydrogen is a colourless substance that is sometimes used to bleach hair. It is harmful to humans. Some cells in the body can break down harmful substances such as hydrogen peroxide into non-toxic chemicals such as water and oxygen. The equation for this is: 2H2O2(aq)-->2H2O(l)+O2(g) One of the organs that can break hydrogen peroxide down into water and oxygen is the liver, which contains catalase. Catalase is an enzyme that acts as a catalyst. This can help to decompose Hydrogen Peroxide quickly. A catalyst is a substance that speeds reactions. The concentration of hydrogen peroxide is given as the volume of oxygen that can be obtained from one volume of the solution. For example, 10cm3 of 1 Volume hydrogen peroxide produces 10 cm3 oxygen when it decomposes. 5 Volume hydrogen peroxide will make 5 times this amount. I predict that the rate of reaction will be faster when the concentration of hydrogen peroxide is higher. ...read more.


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I would expect this to make the rate of reaction faster as there would be more catalyst readily available to speed up the reaction. -The size of liver used will affect the results, for example, if the size of one piece of liver was larger than another piece of liver used with the same strength and amount of hydrogen peroxide, the hydrogen peroxide containing the larger piece of liver will have a faster rate of reaction as it will contain more catalase. -Any error in measurement throughout the experiments in my investigation will affect the results in this investigation, for instance if the hydrogen peroxide was measured incorrectly, different results will be found which could possibly be anomalous. Most of these factors affecting my results are out of my control, such as whether the gas syringe is broken or the size and surface area of the liver (because it is almost impossible to weigh such a small piece of liver). The pieces of liver I used were only approximately the size of a grain of rice, although some were inevitable larger or smaller. Errors in my measurement, however, can be controlled and so I was very careful whilst measuring everything out and timing my experiments. Rebecca Allot 11Y Page 1 03/05/2007 ...read more.

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