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Chemistry Investigation Beginning of Paper 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.) .... Middle of Paper .... 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 a .... 2447 words | 9 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95