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Purpose:
Respiration is an important part of the global carbon cycle. To get energy, organisms (plants, bacteria, animals, yeast, etc.) respire. That means they internally burn sugars back into carbon dioxide gas which is then released into the atmosphere. We can use yeast to experiment with and explore this process. Human activities that change conditions in the air, water and land affect other organisms. We can add different chemicals to the yeast and determine what effects they have by measuring any differences in the observed respiration.
Equipment and Supplies:
For each person or group: 6 test tubes; test tube rack; 100 mL beaker; styrofoam cup (not as tall as the test tubes that you are using); larger beaker or other container to steady the styrofoam cup; thermometer; balance that can weigh gram amounts; 25 mL graduated cylinder; a teaspoon of rapid rise yeast; sugar; water; at least ten balloons that fit tightly over the test tube mouth (smaller balloons sizes are better;......

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Approximate Word Count: 1070
Approximate Pages: 5 (250 words per double-spaced page)

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