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Investigate the decomposition of hydrogen peroxide with certain catalysts.

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Introduction

Task To investigate the decomposition of hydrogen peroxide with certain catalysts. The catalysts available are: Manganese IV oxide (MnO2) Zinc oxide (ZnO) Lead IV oxide (PbO2) Aluminum oxide (Al2O3) Iron III oxide (Fe2O3) Copper II oxide (CuO) Copper III oxide (Cu2O) More specifically, it has been decided to investigate the change in time taken to fill a full test tube with oxygen in relation to a change in the amount of catalyst. Theory The formula for the decomposition of hydrogen peroxide is as follows: 2H202(aq) => 2H20(l) + O2(g) It is worth noting that the compounds used are used as catalysts and therefore they are not used up, nor do they play a part in the equation. ...read more.

Middle

It is equally important to avoid skin contact with the compounds, as some are irritants. This can be done by ensuring that a suitable method is followed precisely so that there are no unexpected events that would lead to skin contact. Variables the following input variables will be present in this experiment. The variables marked with an asterisk (*) will varied, the others will be kept constant: Catalyst. * Amount of catalyst. * Amount of hydrogen peroxide. Temperature of hydrogen peroxide. Temperature of catalyst. In addition, the following output variables will also be present. The variables marked with an asterisk (*) will be measured: Amount of oxygen produced. Time taken to produce oxygen. ...read more.

Conclusion

The former will be investigated by testing three different weights of catalyst: 2g, 4g and 6g. The amount of hydrogen peroxide to be used will be 25ml. Revisions After testing 2g of the one of the best catalysts available, Manganese IV oxide, it was found that the amounts originally planned were much too large. It was therefore decided to reduce them to 0.3g, 0.5g and 0.7g. The test involving 0.3g of Manganese IV oxide took a very short time to complete. It was thought that 0.5g and 0.7g would be too short to record an accurate time and therefore it was decided to further reduce the weights to 0.1g, 0.2g and 0.3g. Results Catalyst Time taken (secs) 0.1g 0.2g 0.3g Manganese IV oxide 7.89 4.37 3.01 Lead IV oxide 9.16 8.13 6.56 Copper II oxide 6+ * 6+ * 6+ * * = Leave for 24 hours ...read more.

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