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Investigating The Effect That Temperature Has On The Rate Of Reaction And Therefore The Amount Of Oxygen Produced

3269 words - 13 pages

Decomposition of hydrogen peroxide2H2O O + 2H2OPlanningAim:Our aim is to investigate the effect that temperature has on the rate of reaction and the amount of oxygen that is produced.Prediction:With reference to my theory, I predict that the initial rate of reaction will increase with the temperature rise up to 50°C where the enzyme used and released by the yeast will become denatured and wont function normally, reducing the initial rate of reaction greatly. This is explained through the kinetic theory, collision theory and the lock and key hypothesis.Hypothesis and theory:Catalase is an enzyme found in food such as potato. It is used for removing hydrogen peroxide from cells. Catalase speeds up the decomposition of hydrogen peroxide into water and oxygen. It is able to speed up the decomposition because of the shape of the hydrogen peroxide molecule. Enzymes are proteins that act as catalysts. They are made in cells. A catalyst is something, which speeds up a reaction but doesn't get used up in the reaction. One can usually be used many times.In this experiment the enzyme is the catalase in the yeast and the substrate is the hydrogen peroxide. There are several theories, which has led me to predict that as the temperature increases, the rates of reaction will increase. However, when the temperature gets above 50°C, I think that the rate of reaction will begin to decrease. One of the theories is the collision theory. 'Chemical reactions occur when particles of the reactant collide with enough energy' (John Holman p225). If the temperature of the solution is high then there is more chance of the particles colliding. This is because if the temperature increases the molecules have more energy so there is more collision. The more energy particles have, the greater the chance of the particles colliding so therefore that gives reason to believe that the rate of the reaction increases.The lock and key theory supports my prediction. As enzymes are catalysts, which speed up reactions, they need to be specific as to which substrate they work on. Enzymes work due to the 'lock and key' theory, where the substrate in this investigation, hydrogen peroxide ('the key'), 'fits' into the active site on the enzyme, in this investigation, the catalase in yeast ('the lock'), and they bind together, the reaction takes place and the substrate unlocks to form one or more new substrates leaving the enzymes, in this experiment that catalase in the substrate fits the shape of the active site unique to that of enzyme. Here is a diagram showing how the hypothesis works;Another theory, which supports my prediction, is the 'kinetic theory'. The kinetic theory states 'with an increase in temperature, the rate of reaction will increase' (John Holman 1995). This is due to the increase of speed of the particles, brought by the extra energy given to them by heat. Faster particles will bring about more particles collisions so the reaction will take place faster. Enzymes are...

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