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To Investigate the Effect of Manganese IV Oxide on the rate of decomposition of Hydrogen Peroxide

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Introduction

To Investigate the Effect of Manganese IV Oxide on the rate of decomposition of Hydrogen Peroxide Rory Good Preliminary Experiment Before we experiment with hydrogen peroxide we need to find out what the best catalyst would be that would react with a solution. The catalysts available are: * Manganese IV oxide (MnO2) * Zinc oxide (ZnO) * Aluminium oxide (Al2O3) * Iron III oxide (Fe2O3) A control is also used in this experiment so that it can be seen that a reaction will take place only when there is a catalyst added to the solution. 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. They simply act to speed up the natural process of hydrogen peroxide decomposition. Predictions I predict that the following compound will be a good catalyst: * Manganese IV oxide I think this because the above compounds are made up of a transition metal. ...read more.

Middle

* It is equally important to avoid skin contact with the compounds, as some are irritants. Ensuring that a suitable method is followed precisely so that there are no unexpected events that would lead to skin contact can do this. 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: * Types of catalyst. * * Amount of catalyst. * * Amount of hydrogen peroxide. * Temperature of hydrogen peroxide. * Temperature of catalyst. Rory Good 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. MAIN EXPERIMENT Method Apparatus 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. ...read more.

Conclusion

RATE 1 TIME Rory Good Graph to show the rate of decomposition of hydrogen peroxide adding different amounts of Manganese Oxide Evaluation The results supported my predictions that I had made earlier on during the experiment towards the rate of decomposition and the rate of reaction between the catalyst and the solution. As the amount of Manganese Oxide was larger there was a much larger reaction and so did the surface area. The most difficult part of this experiment was replacing the bung on the conical flask after placing Manganese Oxide into the flask. This let the catalyst react with the hydrogen peroxide before we could begin to measure the time it took to react and how long the reaction lasted. This was the only flaw to the whole experiment so I would say that the results are pretty reliable. It was also better to use small amounts of the catalyst because if you use too much to start with it is almost impossible to measure how long it took for the reaction to start, as the reaction was so fast. So lowering the amount used/added was good as the time taken could now be measured. ...read more.

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