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The activity of catalase Essay

For example: a) There is a slight delay between pouring the Hydrogen Peroxide into the yeast, putting the bung on and starting the stopwatch. This will slightly affect all the results but as I carried out all the three steps in the same way for all the experiments it should not make any difference to the overall result. b) It is also impossible to precisely measure out the amounts of Hydrogen Peroxide, Yeast and Water each time. As the scale on the pipettes shows the volume to the nearest mm3 the volume of the solutions that I used should be correct to the nearest mm3.

The volume of gas in the test tube to start with is slightly affected by the amount which the bung is pushed down each time, if the bung is pushed down further then the volume in the tube will be less so the 30cm3 of gas is reached faster. c) Due to the fairly slow speed of our reactions it is only possible to measure the time of the reaction to the nearest 0. 1 second even though the stopwatch shows the measurements to the nearest 0. 01 second. ANOMOLIES The plotted results on the graph produce a straight line of best fit to begin with which then goes into a curve of steadily decreasing gradient.

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The only anomalies are the results at 8% and 10%. The result at 8% is slightly above the line of best fit and the 10% result is slightly below it. This is probably due to an experimental error involving one of the factors mentioned above. EXTENSION This experiment could be improved in a number of ways. It could be repeated more times to help get rid of any anomalies. A better overall result would be obtained by repeating the experiment more times because any errors in one experiment should be compensated for by the other experiments.

Using more concentrations of Hydrogen Peroxide would have produced a better looking graph and I would have liked to use concentrations higher than 20% to extend the graph so that the maximum possible rate of reaction could be reached. The problem of the delay between pouring in the Hydrogen Peroxide, bunging the test tube and starting the stopwatch could have been limited by getting another person to start the stopwatch when the hydrogen peroxide was poured into the tube.

This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework.Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework. Info – The UK’s Coursework Database – http://www. coursework. info/ This document was downloaded from Coursework.

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