Investigate the decomposition of hydrogen peroxide with certain catalysts.

equation. They simply act to speed up the natural process of hydrogen peroxide decomposition. Predictions  I predict that the following compounds will be good catalysts: º Manganese IV oxide º Zinc oxide º Iron III oxide º Copper II oxide º Copper I oxide I think this because the above compounds are made up of a transition metal. It is well known that transition metals are good catalysts.  Therefore, I also predict that the following compounds will not be good catalysts: º Lead IV oxide º Aluminum oxide Quite obviously, this is because the above compounds do not contain transition metals û Lead is a group IV metal and Aluminum is a group III metal. Safety Whilst this experiment is relatively safe, there are still safety considerations that must be adhered to:  Due to the dangerous nature of many of the compounds involved in this experiment, it is important that safety goggles or safety glasses are worn during all tests.  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. *  Appearance of decomposition. Method [Picture of apparatus goes here.] Description of Method The above apparatus will be set up. The bung will then be removed temporarily and the catalyst dropped into the hydrogen peroxide. The bung will then be replaced immediately and the stopwatch started. As soon as the test tube is filled with oxygen the stopwatch will be stopped and the time recorded. If the test takes longer than six minutes then it will be left overnight to see if a full test tube can be produced using that particular catalyst. As was mentioned previously, the variables that will be varied will be the catalyst and the amount of catalyst. 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