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Investigating the effect of the enzyme catalase on Hydrogen Peroxide.

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Introduction

Investigating the effect of the enzyme catalase on Hydrogen Peroxide Prediction I think that as you add more potato to the hydrogen peroxide the reaction will be larger until all the hydrogen peroxide is used up and can no longer react. Scientific knowledge The substance on which an enzyme acts is called the substrate of that enzyme. The reaction takes place when the substrate molecule and enzyme molecule join together. Each enzyme can only catalyse one reaction. The lock and key theory is a good way to explain how enzymes work. For example if you put a key in a lock that isn't made for that key it won't fit properly. This works with enzymes the active site and the substrate bind together and a reaction takes place. Although if the substrate isn't the exact same shape then they won't bind together. This is to ensure that the enzyme doesn't take part in the wrong reaction. ...read more.

Middle

pin and place into one of the test tubes (Star timer (Record results (Place four cubes of potato onto a pin and place into one of the test tubes (Start timer (Record results (Place five cubes of potato onto a pin and put in one of the test tubes (Start timer (Record results Make sure that all your cubes of potato come from the same potato or same kind of potato. Make sure that all of your Hydrogen peroxide is of the same concentration and that the room is at the same temperature for each one of it won't be a fair test. Obtain Evidence Results table Number of potato cubes Amount of Hydrogen Peroxide Height of reaction 1 25cm� 0.5 cm 2 25cm� 1.1cm 3 25cm� 1.75 cm 4 25cm� 2.4 cm 5 25cm� 3.0cm Re-done results Number of potato cubes Amount of Hydrogen Peroxide Height of reaction 1 25cm� 0.6 cm 2 25cm� 1.2 cm 3 25cm� 1.75 cm 4 25cm� 2.4 cm 5 25cm� 3.0 cm I repeated my results to check that they were correct and that it was a fair test. ...read more.

Conclusion

It could have also been the fact that the Hydrogen Peroxide in one bottle was of a different concentrate to another one and that because the Hydrogen was left in the test tubes while we did each one separately it could have evaporated or heated up. We could have made it a fairer test if we had cut the potato more accurately and so each piece would have been equal. We could have also made sure that the potato cubes were all from the same potato or the same kind of potato. We could have also made it fairer if the room temperature would have stayed the same this was difficult due to the fact we had a large number of people in our class at the time of the experiment. Also it would have been fairer if the Hydrogen Peroxide was of the same concentrate. It would have also been fairer if we would have had more time because it is easier to do if you aren't rushing. Rebecca Day 10.1 ...read more.

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