Yeast Respiration

Hypothesis: My group and I believe that the room temperature water would have the most bubbles and that the ice water won't have very many if any because temperature will probably denature the effect.

Conclusion:  The purpose of this experiment was to see the affect of yeast respiration. We set up at controlled experiment where we set a test tube with small amounts of yeast and a pack of sugar and then filled the test tube with water, inserted that stopper and placed it in water upside down and waited 20 minutes. Our results show that room temperature had more bubbles than the ice water. These results support our hypothesis because we thought the room temperature would get bubbles because the cold effected the respiration. Our experiments had sources of error which include having air bubbles at the beginning of the experiment.

Materials: Yeast, test tubes, stoppers, beakers, acid/base, hot plate, and sucrose solution.

Procedure: Step 1- Took two testubes

                  Step 2- Put the yeast and sugar in each testubes

                  Step 3: Put water

                  Step 4: Put the stopper in the iced cold water and one in regular water for 20                                       minutes

                 Step 5: Took out them out and examined for the bubbles

                 Step 6: Measured the bubbles

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