1. Name four gases found in ordinary, un-polluted air.
2. Which of these values is likely to be the density of a sample of air at ordinary conditions?
(a) .002 g/mL (b) 2 g/mL (c) 20 g/mL
3. Which gases are removed from air by...
(a) green plants?
(b) animals?
(c) aerobic decomposition?
(d) burning oil, coal, and wood?
4. How does the atmosphere's composition today compare with the air 1000 years ago? (assume un-polluted air.)
5. What happens to air if you cool it to -185oC and raise its pressure?
6. If you have 1.00 mole of oxygen gas, and 1.00 mole of CO2 gas, (at the same temp and pressure), how would their volumes compare?
7. T or F: ALL gases can be compressed.
8. Name the gas given off when you place Alka Seltzer tablets into water.
9. Suppose a student did an experiment; she found that 58 mL of propane has a mass of .14 grams. What would be the density of this gas?
10. What is one similarity between the ocean in which a fish lives, and the "sea of air" in which we live?
11. At what altitude in the atmosphere do we find naturally-occurring ozone (not due to pollution)?
12. Propane is more dense than air. What effect does this fact have on the behavior of soap bubbles made with propane instead of air?
13. Propane gas is very flammable (it burns easily). What effect does this flammability have on propane's ability to make soap bubbles?
14. Air can be compressed in a syringe. Can propane be compressed in a similar way?
15. When we did the lab using Alka Seltzer labs - what would have been the effect on the volume of gas we collected if the gas dissolved into water quite a lot?
Questions? Comments??
Robert Clark