Lab 17: Gas Exchange

Warm Up: What gas is required to keep a candle burning? How do you know?

Vocabulary :
1. Indicators – are chemicals that change their appearance in different types of solutions

2. Oxygen – gas that is breathed in and is absorbed by the body

3. Carbon Dioxide – gas that is breathed in and released by organs and muscles in the body and then is exhaled out of the body

4. Respiratory system – all the organs and tissues involved in respiration, including the nose, larynx, trachea, bronchi, lunges

5. Lung – two sponge like breathing organs in the chest

Hypothesis: What do you think will happen to the indicator when you breathe into the indicator?Why? (skip 2 lines)

Data Table: (skip half of a page)

Analysis/Conclusion:
1. What was the purpose of the solution in Cup A?(skip 2 lines)

2.a. Which of the solutions in Part One contained carbon dioxide? Support your answer with evidence form your experimental results. (skip 3 lines)

2.b. What does this tell you about the exhaled breath of human beings?(skip 3 lines)