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Experiment testing the Time taken for Yeast to rise in Glucose at different Temperatures.
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Experiment testing the Time taken for Yeast to rise in Glucose at different Temperatures Planning Aim: To see how temperature affects the rate of respiration. Investigation plan: * Prepare 5 test tubes. * Add 8 yeast balls to each test tube. (A yeast ball contains little yeast cells. When glucose is added to these at the right temperature, the enzymes cause the fermentation reaction to take place (C6 H12 O6 CH3 CH2 OH + CO2. The yeast becomes less dense causing it to rise.) * Prepare 5 water baths of temperatures 20°c, 30°c, 40°c, 50°c and 60°c. Kept constant by adding hot and cold water depending on the temperature being checked using a thermometer. * Place the test tubes in each different water bath and add 25cm³ of 10% glucose to the test tubes. * Time how long it took for the first yeast ball to rise in each of the test tubes. * Note down the results. *...
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