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I am going to investigate one factor, which affects the rate of decomposition of hydrogen peroxide H2O2 (aq).

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Introduction

GCSE Science - Sc1 Coursework - Experimental and Investigative Science Plan I am going to investigate one factor, which affects the rate of decomposition of hydrogen peroxide H2O2 (aq). We know that when a certain solid is added to a solution of hydrogen peroxide in water, it makes the hydrogen peroxide break down into water and oxygen gas much faster then it would on its own. We also know that the following decomposition takes place: Hydrogen peroxide water + oxygen 2H2O (aq) 2H2O (l) + O2 (g) so this can help me in making a prediction. To make the test a fair one I would only be able to change one thing at a time so therefore the factors, which I could investigate, are: 1) The amount (mass) of catalyst e.g. 0.1g, 0.2g, 0.3g etc 2) Temperature 3) Different catalysts e.g. copper oxide, zinc, iron oxide. 4) State of division of the catalyst (powder, small, medium, large lumps). 5) Rate of swirling e.g. slow, medium, fast. 6) Change the volume of the H2O2 (aq). ...read more.

Middle

I then placed the syringe in the clamp and put the delivery tube going into a bung in the syringe (see diagram below): I then very quickly put the manganese oxide into the boiling tube filled with 20cm� of hydrogen peroxide and put the bung into the boiling tube (see above diagram). I then timed every 10 seconds with a stopwatch and at every 10th second I measured the amount of oxygen that had gone into the syringe. I noted the results down on paper using a pen. I was going to repeat the experiment in order to get averages and make my results more reliable, but I ran out of time. To make the experiment fair I only changed one factor. I also made sure I only started timing once the test tube was attached to the syringe. There were no gaps for oxygen to seep in, making the test a fair one. Results Amount of oxygen in syringe with ...g of catalyst (cm�) Time (secs) 0.1 0.2 0.3 0.4 0.5 0.6 10 12 14 15 34 50 60 20 22 22 44 63 87 97 30 31 31 65 ...read more.

Conclusion

Several times I did not push the syringe back into the original place, so I had to re-weigh and perform the experiment for that particular mass of catalyst. This took up some time. I may have been slightly inaccurate in measuring the amount of oxygen collected in the syringe. This is because you have to look at the stopwatch as well as the measurements on the syringe, which can be hard. Therefore I could have made my results inaccurate by only a couple of cm�. To improve the experiment I could repeat the experiment three times and work out an average for each amount of catalyst. This would make my results more reliable. I could also do the experiment with other people so that one can time, one person could read and another could write down the results. This would make my results more reliable. It would also be a good idea to use a syringe that can hold more than 100cm� because I could see how long it took to actually stop decomposing, improving my results. To further my work I could repeat the same experiment using different catalysts such as copper oxide or iron oxide and see if they worked better at decomposing the hydrogen peroxide quicker. 1 ...read more.

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