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To determine if the increase of surface area of a potato will increase the amount of gas given off, when combined with hydro peroxide.

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Introduction

Biology coursework Aim To determine if the increase of surface area of a potato will increase the amount of gas given off, when combined with hydro peroxide. Hypothesis For this experiment I predicted that as the surface area is increased the amount of gas given off would increase. The reason for this prediction is because as more potato is exposed to the liquid around it there is more potato to react with. If it were whole with only around 4 sides for the hydro peroxide to come into contact with there would be less of a reaction because the inside of the potato can not be reacted with the liquid around it and therefore less gas, but by cutting the potato into more parts this gives more surface area to react with and if the experiment goes to plan this hypothesis should be correct. Scientific Background An enzyme is a large protein molecule that works by reacting with another compound called a substrate. In this case the enzyme is the potato and the substrate is the hydrogen peroxide. ...read more.

Middle

This was done every 60 seconds to see how much it increased by. These results were recorded by hand on paper. Analysis and Evaluation The results show an increase of oxygen every 60 seconds. This increase is by about 1 or 2 sometimes 3 cm3 per 60 seconds. This reflects on the graph as when a line of best fit is shown there is a straight shallow line increasing steadily as the surface area increases. This agrees with my hypothesis. As the surface area increases the more molecules of hydrogen peroxide can come into contact with the surface of the potato and therefore the more pieces of potato added to the hydrogen peroxide the faster the reaction will be and there for more oxygen will be released in a shorter space of time. The results are in my opinion very accurate as the experiment was repeated four times. The only minute inaccuracy in the measurements was the size of the potato chips measured only by a standard ruler. The experiment on the whole went well. ...read more.

Conclusion

Also there was a limited amount of time to complete the experiment and I feel more accurate results could have been obtained if more time was given. If I were to repeat this experiment the following changes would have been made. Firstly I would invest in more accurate equipment to get the results as clear as possible. Secondly more time would be made available, as the potato chips, if left, seemed to go on for a much longer period of time then the time available during the experiment and thirdly if enough time was given I would investigate the experiment further by adding more variables for example varying the temperature to see if it would speed up or slow down the reaction. Conclusion The experiment was a success as the results obtained were enough to prove my hypothesis and prove that the greater the surface area the more oxygen is released. This also proves how enzymes work as a catalyst and the more of the potato introduced the faster the reaction takes place. As any reaction the more of a catalyst you introduce the faster the result. I therefore conclude that the experiment has successfully completed my aim showing everything the practical was carried out for. ...read more.

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