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Investigate A Factor Which Affects the Rate Of Fermentation Of Yeast This experiment is investigating one of the factors which affects the rate of fermentation of yeast Several factors affect the rate of reaction Increasing the concentration See the lock and key theory If the substrate glucose is increased then there would be more keys for the locks therefore an increase in reactant concentration leads to an increase in reaction rate The surface area the bigger the surface area the faster the reaction time is as the reactant can reach more parts The temperature an increase in temperature leads to an increase in reactant rate Generally as the temperature is increased the particles get more energy so they bump into one another more therefore speeding up the reaction time This is called the collision theory which I will discuss in greater depth later Whether or not there is a catalyst A catalyst speeds up the rate of reaction and remains chemically unchanged by the end of the experiment A catalyst lowers the activation energy This is the energy needed to start a reaction The variable that I have decided to change is the temperature I have decided to alter the temperature of the yeast and time the amount of carbon dioxide that will be given off at different temperatures I have decided to time how much carbon dioxide is given off in five minutes Throughout the investigation I will keep the temperature the same as I have specified for each reading For example if I am taking a reading in which the temperature must be 5 degrees I will make sure that the yeast is kept at this temperature When I am altering the temperature of the yeast I will place it in a water bath of the specified temperature which makes the temperature much more
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