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What affects the decomposition of Hydrogen peroxide?

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Introduction

What affects the decomposition of Hydrogen peroxide? Aim: To find what affects the decomposition of hydrogen peroxide. The hydrogen peroxide breaks down into water and oxygen, (2H202=>2H2O + O2) Proposal: I have a choice of changing the following variables: * Catalyst * Amount of catalyst * Concentration of hydrogen peroxide * Temperature of hydrogen peroxide * Temperature of catalyst I will be exploring how the concentration of hydrogen peroxide affects the decomposition of hydrogen peroxide. I shall keep all other variables constant. I will mix different concentrations of hydrogen peroxide by adding certain amounts of water to lower the concentration. I will then add this solution to 1gram of manganese IV oxide (MnO2). I have chosen manganese oxide because in the pulmonary tests it was by far the most reactive substance out of: * Manganese IV oxide * Zinc oxide * Lead IV oxide * Aluminium oxide * Iron III oxide ...read more.

Middle

This is because there is more chance of the hydrogen peroxide molecules colliding with manganese IV oxide molecules, because there are many hydrogen peroxide molecules. Equipment: * Water Bath * Conical Flask * Delivery tube * Burette * Hydrogen Peroxide * Manganese IV Oxide * Scale * Stopwatch Method: 1. Set up apparatus as pictured. 2. Measure 20 x 1gram trays of manganese oxide. 3. To measure solutions: For 20% - 100ml of Hydrogen Peroxide 0ml of water For 17.5% - 87.5ml of Hydrogen Peroxide 12.5ml of water For 15% - 75ml of Hydrogen Peroxide 25ml of water For 12.5% - 62.5ml of Hydrogen Peroxide 37.5 ml of water For 10% - 50ml of Hydrogen Peroxide 50ml of water For 7.5% - 37.5ml of Hydrogen Peroxide 62.5ml of water For 5% - 25ml of Hydrogen Peroxide 75ml of water For 2.5% - 12.5ml of Hydrogen Peroxide 87.5ml of water For 0% - 0ml of Hydrogen Peroxide 100ml of water 4. ...read more.

Conclusion

There was one anomaly in test 1 for 10% hydrogen peroxide. However, when I averaged the results out they showed what I had expected; the higher the concentration, the higher the reaction rate. This is because there is more chance of the hydrogen peroxide molecules colliding with manganese IV oxide molecules, because there are many hydrogen peroxide molecules. Although the enzyme was used in the reaction, it is not chemically involved in the decomposition of hydrogen peroxide. Evaluation I think that the experiment was performed well and produced good results. The experiment was mostly fair; all of these were kept constant: * Catalyst * Amount of catalyst * Temperature of hydrogen peroxide * Temperature of catalyst The temperature of the room may have changed during the time of which we carried out the experiment. To make sure this does not happen if I do it again I will measure the temperature throughout the experiment. ...read more.

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