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Find out how different surface areas affect the breakdown of hydrogen peroxide.

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Introduction

M G 0005 Enzymes Aim To find out how different surface areas affect the breakdown of hydrogen peroxide. Plan I plan to use potato pieces; cut to 4cm long and for the fist experiment I shall leave it as whole and for the rest of the 4 other experiments I shall divide it up, fist of all divide it into 1/2,1/4, 1/8 and pulp surface areas, and then to place them individually into a beaker of hydrogen peroxide. I will have rubber tubing coming from hydrogen peroxide beaker and the opposite end going into the test tube of water. When placing the potato pieces into the hydrogen peroxide I shall start the stopwatch and leave the experiment going for 5 minutes and count the number of oxygen bubbles that are produced in the beaker of water within the time, to determine the rates of the different surface areas. I will repeat the experiment again to check my first set of results. To prepare the test I am using a variety of equipment to ensure my work is accurate and valid Equipment * 1 beaker * 1 test tube * 1 rubber tubing * Cork borer * Size 2 pieces of potato * 20 cm� of hydrogen peroxide * Tub full of Water * Stop watch Diagram Prediction I predict that changing the surface area of the potato will affect the break down of hydrogen peroxide. ...read more.

Middle

From my scientific knowledge the more concentrated the solution the greater the rate of reaction. This is because increasing the concentration means there are more particles of reactant bumping about between the molecules, which make collisions between the important particles more likely. This therefore means increasing the rate of reaction. Safety For safety purposes I shall wear safety spectacles throughout the experiment. I will make sure that I take more care when using the knife for cutting the potato, as I could cut myself or even some other person around me. I will also place the knife and experiment on a flat and even surface as if it were to fall; it could cause much danger to people. Preliminary Tests Size of each piece Attempt 1 no. of bubbles &Size of bubbles Attempt 2 no. of bubbles &Size of bubbles Averages no. of bubbles &Size of bubbles 1) 4cm 20(3mm diameter) 19(3mm diameter) 19.5 (3mm diameter) Tests Attempt 1 no. of bubbles Attempt 2 no. of bubbles Averages no. of bubbles Size of each piece Average Size of bubbles (6mm diameter) Average Size of bubbles (5mm diameter) Overall average size of bubbles (5.5mm diameter) 1) One piece (4cm long) 22 22 22 2) 1/2 (2pieces 2cm long) 27 28 27.5 3) 1/4 (4Pieces 1cm long) 32 35 33.5 4) 1/8 (8pieces 0.5cm long) ...read more.

Conclusion

The second test was slightly different, in terms of results. I realised that it was slightly different because I had used a new batch of hydrogen peroxide, which was more reactive than the last time, but they both show correlation and that as the surface are is increased, so is the number of bubbles produced. To be able to write a firmer conclusion, I could have increased the length of the potato (cut it to 6 cm long) to begin with. This way, the surface area would have increase more than it did so, and the oxygen produced would increase a lot more visibly. Though the potatoes were the same size and length, they were not the same weight and so there must obviously be a better method of obtaining accurate size potatoes. One approach of improving this problem would have been to use a weighing scale that could quite adequately measure to the nearest hundredth, simply for accuracy purposes. By doing this I could have also investigated whether the decomposition reaction taking place in the beakers, would affect the weight or mass of the plant tissue. Another way of measuring the amount of oxygen that is produced is by measuring the amount of foam that has been produce by using a ruler. This method will not be as accurate as the one I have chosen, but will give you the results that are needed. ...read more.

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