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Investigating the affect of temperature on the enzyme catalase

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Introduction

Investigating the affect of temperature on the enzyme catalase Course work Introduction Temperature is expected to effect the rate of activity of an enzyme. At low temperatures the enzyme molecules have very little energy, this results in few collisions between the enzymes and substrates and thus few reactions. Enzymes are therefore still active at low temperatures, they do not collide enough to cause lots of reactions. As the temperature increases the amount of collisions increase. This is due to the energy gained from the heat. The more collisions there are occurring the bigger the reaction. When the optimum temperature is reached the enzymes work at there full capacity. This means at all times the enzyme is mediating reactions due to continuous collisions. Above the optimum temperature the collisions become increasingly violent. The enzymes 3D shape denatures due to the collision and temperature breaking the bonds. ...read more.

Middle

Above a temperature of 40�C, the rate of reaction rapidly decreases and only a very little amount of O2 was produced at 50C or 60�C. This probably had nothing to do with the enzyme. It is likely, as it is such a small amount, that the O2 produced was the natural breaking up of hydrogen peroxide. At 100C there was no rate of reaction. This relationship agrees with my prediction that the rate of reaction would reach its peak around the optimum temperature (40C), above the optimum temperature the rate of reaction would decrease The relationships correspond with the Enzyme theory. At low temperatures the enzyme molecules have very little energy, this results in few collisions between the enzymes and substrates and thus few reactions. Enzymes are therefore still active at low temperatures, they do not collide enough to cause lots of reactions. When the optimum temperature is reached the enzymes work at there full capacity. ...read more.

Conclusion

This change is irrversable. Background science At a high temperature the enzyme will be completely denatured due to the complete collapse in its 3D structure. Catalase is an enzyme found in all living cells. It makes Hydrogen Peroxide decompose into water and oxygen. You can represent this in the equation: 2H2O2 =2H2O + O2 Enzymes: Enzymes are able to increase the rate of reaction without actually being consumed in the process. In all, enzymes are very efficient. Small quantities at low temperatures are able to produce results, which would require high temperatures and a violent reaction from any normal chemical means. Although increases in temperature may speed up the reaction, enzymes are unstable when heated. Evaluation The experiment went well, this is because I had an accurate set of results, which corresponds with my predictions. Also there were no abnormal patterns that occurred because my experiment was carried out fairly and accurately. I feel that if I had repeated the experiment more times my evidence would have been more tangible to support in of the enzyme theory. ...read more.

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