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An Investigation to show how the Surface Area affects the Rate of Reaction between Catalyse in Potato and Hydrogen Peroxide

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Introduction

Cerith Leighton Watkins. Biology Investigation. An Investigation to show how the Surface Area affects the Rate of Reaction between Catalyse in Potato and Hydrogen Peroxide, (H2O2). My Prediction. I predict that the smaller the potatoes are cut up the faster the reaction will take place simply because there is more surface area for hydrogen peroxide to react with. The surface area is the area of a solid that is exposed to the hydrogen peroxide or any other liquid chemical. The smaller the potato is cut up means the surface area increases so the catalyse inside the potato cells reacts at a quicker rate. When we cut the potato up into smaller pieces the hydrogen peroxide particles have more surface area there is for it to collide with so this is why it reacts quicker because more are colliding with the potato pieces. I predict that on my graph as the surface area is increased the lines on the on it will become steeper. The graph shows the amount or volume of the oxygen collected. The reason for the greater the surface area the quicker the reaction is because of a theory called the 'Lock and Key' theory. ...read more.

Middle

?We had to use the same size potato cutter every time so the potatoes had the same diameter. We used a size 5 cutter to do this. ?Hydrogen peroxide measurements had to be the same otherwise there would be anomalous results. ?We had to make sure that the potato was the same length every time, which was 4cm. ?The same concentration of H2O2 was also vital. This was 20% H2O2. ?We made sure we used the same member of our pair to do the same job all the way through the experiment just to make sure we kept a consistency. ?We used the same apparatus all the way through the tests so there was no chance of anything being different so our results were accurate. Preliminary Work. This is our preliminary work to test what size and width we wanted our potato cuttings. Diameter of the potato cutter = 0.85cm, (Size 5). Potato was 4cm long. Room temperature = 34�C. Time (Seconds) Oxygen Collected (cm�) Full Potato Diced Potato Crushed Potato 2cm H2O 4cm H2O 10cm H2O 10cm H2O 10cm H2O 10cm H2O 0 0.0 0.0 0.0 0.0 0.0 0.0 30 0.0 0.2 0.4 1.5 2.5 1.2 60 0.5 1.0 1.6 3.9 8.0 7.2 90 0.9 ...read more.

Conclusion

With our first experiment there was the least amount of surface area meaning that the rate of reaction was at its slowest. My results came out as I expected and the prediction I made was correct. Evaluation. Throughout the whole experiment we worked well and most importantly we worked safely. We did our utmost to make all the tests in the experiment as fair as possible also. I do not think that there was very much more we could do to get even more accurate results. One suggestion we discussed was that maybe we could have improved or figured out a way to get every potato cutting the same length each and every time. We could have achieved this by making some kind of stencil that would be placed on the potato and would be 4cm long and it would allow us to cut the potato exactly the same length every time. The experiment ended up the way that we expected because we obtained the results that I imagined we would obtain. Our results show that the greater the surface area of the potato pieces the quicker the reaction would take place. This is what was expected and is shown in our results, (the graph). ...read more.

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