Answer the following questions:

1. What is pressure?
2. Describe a gas and its properties.
3. What causes the pain in our ears when we change altitude?
4. What is the relationship between the pressure and volume of a gas?
5. What is the relationship between the temperature and volume of a gas?
6. How does a hot air balloon function? How is windy coastal weather related to Charles's law?
7. Why is oxygen central to the existence of animal life? Use reactions to explain.
8. The pressure on Mt. Everest is approximately 0.31 atm. What is this pressure in mmHg?
9. Convert 725mmHg to the following:
   1. torr
   2. atm
   3. in.Hg
   4. psi
   5. N / m²
10. A balloon is inflated to a volume of 2.5 L in an airplane where the pressure is 0.60 atm. What will be the volume of the balloon on returning to sea level, where the pressure is 1.0 atm?
11. A balloon is inflated at 25C to a volume of 2.5 L and then immersed in liquid nitrogen at a temperature of 77 K. What will be the final volume of the balloon? (Note: If you actually try this experiment, the final volume of the balloon will probably be smaller because some of the gases within the balloon will condense. However, the experiment does work, and if undisturbed, the balloon will return to its original volume on warming.)
12. A cylinder with a movable piston has an initial volume of 0.4 L at a pressure of 7.010₂ torr and temperature of 40C . What will be its volume if the pressure changes to 2.010₂ torr and the temperature changes to 80C ?
13. Could an astronaut use a straw to drink a beverage on the moon? Why or why not?