Gas Laws Homework Name
___________________
P2V2
1.
A balloon is taken from the cold car into the warm house, its
volume increases
Which gas law does this illustrate? Charles’
(Boyle’s, Charles’, or Gay-Lussac’s)
2. As the tires on your car cool
off over night, the pressure in them goes ________________
Which gas law does this illustrate?
_________________________
3. To use a straw, you use your muscles to
increase the size of your mouth and
throat.
When you do this, the pressure of the air
in your mouth
____________________________
Which gas law does this illustrate?
_________________________
4.
A scuba diver holds her breath as she swims to the surface so the
volume of her lungs ___________________________
Which gas law does this illustrate? _________________________
5. What happens to the pressure if molecules of
gas are removed from a container? ___________
(assume that V and T remain constant) would pressure go up or down if there were fewer molecules
in the container?
6. What happens to the volume of a gas if the
temperature is increased? ____________________
(assume that P and n remain constant)
7. What happens to the temperature of a gas if
the pressure is decreased? ___________________
(assume that V and n remain constant)
8. What happens to the volume of a gas if the
pressure is increased? _______________________
(assume that n and T remain constant)
9. A balloon of air occupies 2400 ml of space in
a room at 22oC. How big would the balloon be
in a room that was –36oC? (remember to convert to
Kelvins when you are using gas laws)
T1 T2
10. A cylinder of compressed CO2 is
used as a propellant in a paintball gun.
The
cylinder starts out at 20oC with a pressure of 6
atm. After a few shots, the temperature
of the
gas inside has dropped to –30oC. What is the pressure?
Always use Kelvin scale with gas laws
You should have found that the pressure
went down. Why would the pressure drop
as the
gun is fired?
What happens to
the number of molecules?
11. A 3500 ml helium balloon is released at sea
level where the air pressure is 760 torr. By the
time it reaches the top of Mount Everest
the pressure only 270 torr. How big is the balloon at
this altitude?
12. A SCUBA diver checks her tank’s air pressure
on the shore, where the temperature of the
tank is 25oC, and finds that it has
3200 psi of pressure. After she paddles
out to her dive
location her tank’s temperature has
dropped to 8oC. What is the new reading on
her
pressure gage?
First convert temperatures to Kelvins: 25 oC + 273 = 298 K, 8oC+ 273 = 281 K
then use
13. A person has a balloon with 1200 ml of air in
it, and she is sitting on the runway in
an
airplane where the temperature was 25oC, and the pressure was 762 torr. What is the
cabin
pressure when she checks the balloon
again at cruising altitude and finds that its volume is
now 1486 ml and the cabin temp is 15oC?
14. A SCUBA diver is sitting on the bottom of the
ocean at a depth of 40 meters (where the
pressure is 4.0 atm) when she blows an
“air-ring” that has a volume of 184 ml when it leaves
her mouth. The temperature of the water (and the air in
the bubble) is 4oC. What is the size
of the bubble when it is 1 meter from
the surface, where the pressure is 1.1 atm and the
temperature is 30oC?
use the combined
gas law
15. A 588 ml compressed-air paintball canister
is pressurized to 304 atm of pressure at 20oC,
how many moles of air molecules does it
contain?
Convert 20oC to Kelvins then use
16. If a 25,000
ml SCUBA tank contains has 235 moles of air molecules at a
temperature of 15 oC, what
is the pressure?
17. The diagram below represents an airplane wing. Circle either "high" or "low" to
explain how wings provide lift.
Above Speed: high or low Pressure: high or low
Below Speed: high or low Pressure: high or low
Answers
|
9852 ml |
|
732 ml |
|
7.4 moles |
|
595 torr |
|
5 atm |
|
3017 psi |
|
223 atm |
|
1928 ml |