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What Factors Affect The Rate Of The Decomposition Of Hydrogen Peroxide With A Fixed Mass Of Catalyst?

5011 words - 20 pages

PLANNINGAim:Our aim is to detect which factors affect the rate of the decomposition of hydrogen peroxide with a fixed mass of catalyst. A catalyst is a substance, which alters the speed, or rate of a chemical reaction but is chemically unchanged at the end of the reaction. The two factors that we can change are the temperature and the concentration.We chose to vary the concentration of hydrogen peroxide. The catalyst to speed up the reaction without affecting the result will be manganese oxide.Prediction:I predict that the higher the concentration of hydrogen peroxide, the faster hydrogen peroxide and manganese oxide decomposes. Therefore the lower the concentration of hydrogen peroxide, the lower the rate that hydrogen peroxide and manganese oxide decompose.The prediction we have just made has been based on the collision theory-'Chemical reactions occur when particles of the reactant collide with enough energy' (John Holman page 225). If the concentration of the solution is high then there is more chance of the particles colliding. This is because if the concentration increases then so does the number of particles. The more particles there are, the greater the chance of the particles colliding so therefore that gives reason to believe that the rate of the reaction increases.Pre-testDuring our pre-test lesson we needed to find the ideal mass of catalyst. We began with 1g of manganese oxide, which we weighed on a top-pan balance and added it to 100cm" of hydrogen peroxide. We used 100% concentration because we thought that to ensure our catalyst mass was suitable we needed to see what the most reactant experiment would be like. However, 1g of manganese oxide seemed to be too much as the amount of gas was produced too quickly and we were unable to record any results. Next, we used 0.1g of manganese oxide, however this seemed to be too much as again we were unable to record any results. Lastly we used only 0.05g of manganese oxide and this seemed to be the right amount. During this pre-test we felt we were able to record results at a steady speed and we were able to do this accurately.Also from our pre-test lesson it became clear that to keep the experiment as accurate as possible, we should place the manganese oxide in the conical flask and then add the hydrogen peroxide. This is because if we add the catalyst afterwards the reaction starts to take place and yet all the catalyst has not yet been put in. We have decided to see how much gas has been released in 90 seconds.Here are our pre-test results:Time(Secs) Test 1Volume of gas (cm") Test 2Volume of gas (cm")0 0 05 10 1110 19 1715 24 2620 35 3725 45 4430 50 5135 58 5940 65 6645 72 7450 78 7855 84 8260 90 9165 96 9770 100 10075 ...

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