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To show the link, if any, between the rate of reaction of hydrogen peroxide and catalase and the surface area of the catalase source (potato).

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Introduction

AT1: HYDROGEN PEROXIDE AND CATALASE Aim To show the link, if any, between the rate of reaction of hydrogen peroxide and catalase and the surface area of the catalase source (potato). Prediction I am going to make 2 predictions on this experiment. The first prediction I am going to make is that the larger the surface area that the particles of hydrogen peroxide have to work on the larger the reaction. The second prediction that I am going to make is that if I double the surface of the catalase source then the reaction will double or if I triple the surface area of the catalase source then the reaction will triple. I have found out that potato is a strong source of catalase and therefore I will use potato as my catalase source in this experiment. If you have a 1 cm3 piece of potato then you have 6 cm2 of surface area on which the reactant can react with, but if you cut this into 2 even pieces then you will have an extra 2 cm2 area on which the reactant can react, giving you a total of 8 cm2 surface area. ...read more.

Middle

Cut 15 even 1 cm3 cubes out of the potato. You will need to use your ruler and scalpel. 2. Put 1 of the potato cubes into a Boiling tube. Now cut 1 of the cubes in half and place the pieces in different tube. Now cut 1 of the cubes into quarters and place pieces in a different tube. Now cut 1 of the cubes into eights and place pieces in a different tube. Now cut the last cube into sixteenths and place pieces into a different tube. 3. Measure out 60 ml of Hydrogen Peroxide with the measuring cylinder and pour into the first boiling tube. Now start the stop clock straight away making sure that all the potato is submerged. Time for 1 min 30 sec and then measure the height of the froth (oxygen bubbles) produced in the tube and record result. 4. Repeat step 3 with all off the tubes. 5. Repeat steps 1 to 4 twice more Results SURFACE AREA OF THE POTATO (CM2) ...read more.

Conclusion

I did not get any anomalous results although my line of best fit did not include all my points, which means that my experiment was inaccurate in certain aspects. If you use a test tube to carry out the experiment that is not thoroughly clean then this may and probably affect your results and as I did not clean my test tubes before starting this may have played a part in the alterations of my results. During this experiment there were many variables which could have been controlled and changed to alter the experiment. During my experiment I did not control factors such as light intensity and temperature which could have exposed my results to change to get better results in my experiment I could have changed a different variable which would have given me more results to work with. There were many ways in which I could have extended my experiment as I briefly mentioned above. I could have repeated this experiment several times to receive a better average or used more surface areas to compare more results. Overall I think my experiment went quite well. ...read more.

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