Ask students to name the gas that animals exhale. Have students repeat the procedure to test for the concentration of carbon dioxide gas they exhale. Have students predict if the results will be the same or different. Will human exhaled air have a higher concentration of carbon dioxide gas than that created when vinegar and baking soda are mixed. Observe and record results.
Some people think the levels of carbon dioxide in our atmosphere are too high.
They are afraid Earth's temperature will rise making it unhealthy for life. The World Resources Institute says electric utility companies, industry, business and homes, and transportation cause carbon dioxide levels to build up in our atmoshpere. Using pictures and words, explain how you could help reduce the levels of carbon dioxide. This experiment will take two class periods to complete.