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I am trying to find out what happens if I change the surface area of a potato cylinder and whether or not the amount of oxygen produced by the enzyme catalase changes.

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Introduction

Aim: I am trying to find out what happens if I change the surface area of a potato cylinder and whether or not the amount of oxygen produced by the enzyme catalase changes. Prediction: I predict that the larger the surface area of the potato cylinder, the more oxygen there is produced. The scientific evidence that supports my prediction is because there is more surface areas, there are more enzymes so therefore more active sites. The active sites are what produce the oxygen so the more active sites exposed the more oxygen there is produced. Information about enzymes! What are enzymes? Enzymes are biological catalysts. They speed up chemical reactions in all living things, and allow them to occur more easily. They occur in plant cells and animal cells. Without them we would not be alive. Enzymes are proteins. ...read more.

Middle

Just like a key only fits into a specific lock, each enzyme has its own specific substrate. This is called the lock and key theory. Although they work powerfully, enzymes are just chemical molecules, made up of proteins. They are too small to be seen either when they are inside cells or after they have been released from them, for example in the digestive system. Each particular enzyme has a unique, 3-dimensional shape shared by all its molecules. Within this shape there is an area called the active site where the chemical reactions occur. The effect of temperature on enzyme action Temperature is important in all reactions. As the temperature increases, so does the rate of reaction. This is because heat energy causes more collisions between the particles in the enzyme and particles in the substrate. ...read more.

Conclusion

As the potato reacts with the hydrogen peroxide, oxygen is given off and collects in the tap burette. The tap burette is filled with water so that I can tell how much oxygen the potato and hydrogen peroxide is giving off. I will then relate it to the measurement of the potato cylinders and their surface areas. In theory, the larger the surface area of the potato, the more enzymes there are to produce the oxygen. The results will be put into a table similar to this one: Surface area (cm ) Attempt 1 Attempt 2 Attempt 3 Average To make my results reliable and a fair test I will keep the volume of the potato the same, the temperature the same and the volume of the hydrogen peroxide the same. ...read more.

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