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There are a whole range of enzymes that catalyse the breakdown of hydrogen peroxide, occurring in both microbial, plant and animal cells. According to the International Union of Biochemistry these are in group 1.11 of "peroxidase" enzymes

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Introduction

Notes on Biology experiment There are a whole range of enzymes that catalyse the breakdown of hydrogen peroxide, occurring in both microbial, plant and animal cells. According to the International Union of Biochemistry these are in group 1.11 of "peroxidase" enzymes as "acting on peroxide as acceptor". The most well-known enzyme that breaks down hydrogen peroxide is called catalase or the full name is hydrogen-peroxide: hydrogen peroxide oxidoreductase (EC number 1.11.1.6). Catalase breaks hydrogen peroxide down into oxygen and water. The reaction is 2 H2O2 (+enzyme) = O2+ 2 H2O(+enzyme) Some other information about catalase and peroxidases: * Catalase is a relatively famous enzyme in that it it is an enzyme described as "virtual catalytic perfection" having the highest turnover and catalytic efficiency numbers numbers measured, catalysing over 10 million reactions per second. * In higher organisms catalase is located in organelles called peroxisomes, usually in the liver and kidneys in mammals. Here catalase plays an important role in how the body detoxifies various toxic molecules in the bloodstream, ethanol being one of the important toxic molecules! ...read more.

Middle

2) The power supplied by the gas. 3) The gas supplied to the Bunsen burner. 4) The insulation. Prediction & Science: I predict that the larger the amount of the water, the slower the kettle will take to heat. Basically, more mass of water causes the temperature of the water to increase less quickly. You see, the more mass of water you have, the more particles there are to heat. If you have more particles to heat, the kettle needs more energy supplied to it to heat the water. Some materials need larger amounts of energy than others to produce an increase in temperature. They are much better at storing thermal energy and so have much more to get rid of when they cool down. Notice that water has a particularly high specific heat capacity. This makes it a useful substance for storing and for carrying energy. Such materials are said to have large specific heat capacities. The specific heat capacity of a material is the energy needed to raise the temperature of 1kg of it by 1 degree centigrade. ...read more.

Conclusion

Method: Firstly, I set up the apparatus above. I filled my beaker with water and put a lid on it. Then I lit the Bunsen burner and placed it under the beaker. At that point I started the stopwatch and took the temperature. At the end of the experiment, I measured the temperature again. I will make my measurements as accurate as possible by repeating them and finding an average. I will also use the same apparatus in each experiment and make sure I have measured the amounts of water correctly. Finally I will make sure the Bunsen burner is always on a blue flame and the thermometer is at room temperature before every experiment. I will make my experiments safe by following the Laboratory safety rules carefully. After all, they're there for a reason! I will be careful when handling the apparatus before and after the experiments and be cautious that the apparatus may be hot. I will tuck in my tie so it will not get burnt by the Bunsen burner and I will take care not to burn myself or anybody else with the hot water after the experiments. ...read more.

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