Amount Of Gas 12-2 Wks 09 Chem

12-2 Factors Affecting Gas Pressure Amount of Gas (pages 330 –331)

Name ____________ Hr___

1. How do conditions change inside a tire when you pump it up with a tire pump? _________________________________________________________________________________________ 2. The diagrams below show a sealed container at three pressures. Complete the labels showing the gas pressure in each container.

N particles

1.5 X N particles

3. What can happen if too much air is pumped into a tire?

6.3 X N particles

4. Is the following sentence true or false? When a sealed container of gas is opened, gas will flow from the region of lower pressure to the region of higher pressure. ______________________ 5. Look at Figure 12.7 on page 331. What happens when the spray button on an aerosol spray can is pressed? _________________________________________________________ _________________________________________________________ _________________________________________________________

Volume (page 331)

6. In the diagram, complete the labels showing the pressure on the piston and the gas pressure inside the container.

100 kPa 100 kPa

______ kPa ______ kPa

7. When the volume is reduced by one half, what happens to the pressure?

__________________________________________________________________________ __________________________________________________________________________ 8. Is the following sentence true or false? Raising the temperature of an enclosed gas causes its pressure to decrease. ______________________

9. Circle the letter next to each sentence that correctly describes how gases behave when the temperature increases. a. The average kinetic energy of the gas particles increases as the particles absorb thermal energy. b. Faster-moving particles impact the walls of their container with more energy, exerting greater pressure. c. When the average kinetic energy of enclosed gas particles doubles, temperature doubles and pressure is cut in half. 10. Explain why it is dangerous to throw aerosol cans into a fire. _______________________________________________________________________________________

__________________________________________________________________________ 11. How are the average kinetic energy of gas particles and their Kelvin temperature related? _______________________________________________________________________________________

__________________________________________________________________________ 12. Decide whether the following sentence is true or false, and explain your reasoning. When the temperature of a sample of steam increases from 100 °C to 200 °C, the average kinetic energy of its particles doubles. _______________________________________________________________________________________

__________________________________________________________________________ 13.

What caused the can to burst in this picture?

_________________________________________________________ _________________________________________________________ 13a. What could have prevented the can form bursting? _________________________________________________________ _________________________________________________________ 14. Gas pressure is affected by a. Temperature, volume, and the amount of the gas. b. Temperature, volume, and the molar mass of the gas. c. Phase diagram, volume, and the size of the container. d. Temperature, phase diagram, and the mass of the gas container.

15. For gases, the SI units for volume (V), pressure (P), and temperature (T) are, respectively, a. liters, kilopascals, and °C. b. liters, kilopascals, and kelvins. c. cm3, kilopascals, and kelvins. d. liters, atmospheres, and °C. 16. Compared to liquids and solids, gases are easily compressed because the particles in a gas a. Attract each other. b. Are spaced relatively far apart.

c. Are very small. d. Repel each other.