Download Test Chap 5 gas laws

AP Chemistry – Chapter 5 – Test.
Mr. Richardson
Sept 17, 2003
1. What is the cause of gas pressure? (1pt)
2. On the Kelvin scale, a temperature of 22
degrees Celsius has a value of what? (1pt)
Name:_________________
Section #:_________
7. In a closed container at 1.0 atmosphere,
the temperature of a sample of gas is raised
from 300 K to 400 K. What will be the final
pressure of the gas? (3 pts)
3. Convert 120 K to ºC (1pt)
4. Define diffusion (1pt):
8. A sealed, inflexible container of oxygen
gas has a volume of 2 liters. When the
temperature of the gas is 300 K, the
pressure in the container is 110 kPa. At what
temperature will the pressure be cut in half?
(3 pts)
5. Define Effusion (1pt):
6. At standard pressure, a sample of
nitrogen occupies 500 mL. What volume
does the gas occupy when the pressure
doubles? (3 pts)
7. At a pressure of 5.0 atmospheres, a
sample of gas occupies 40. liters. What
volume will the same sample occupy at 1.0
atmosphere? (3 pts)
9. Organize the following gasses in order of
their rates of diffusion, from slowest to
fastest. (1 pt)
 Oxygen, O2
 Ammonia, NH3
 Hydrogen, H2
 Carbon Dioxide, CO2
10. Which of the following gases would have
the fastest rate of diffusion, assuming all of
the gases are at the same temperature? (1
pt)
 Ne
Ar
 Kr
He
 N2
CO2
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15. When ammonium nitrite undergoes
decomposition, only gases are produced
according to the equation: NH4NO2(s)
 N2(g) + 2H2O(g)
11. Each of these flasks contains the same
number of gas molecules. In which would the
pressure be lowest? (3 pts)
What is the total volume of gases produced
at 819K and 1.00 atm pressure when
128 g of ammonium nitrite undergoes
the above decomposition reaction? (3
pts)
12. A sealed flask contains 1 molecule of
hydrogen for every 3 molecules of helium at
20 °C. If the total pressure is 400 kPa, what
is the partial pressure of the hydrogen? (3
pts)
16. What is the pressure exerted by some
nitrogen gas collected in a tube filled with
water on a day when the room temperature
is 18.0 °C and the room pressure is 750.0
mmHg? [The partial pressure of water at 18
°C is 15.5 mmHg.] (3 pts)
13. A mixture of gases, nitrogen, oxygen,
and carbon dioxide at 27 C and 0.50
atmospheres pressure occupied a volume of
492 mL. How many moles of gas are there
in this sample? (3 pts)
14. A mixture of gases at 810 kPa pressure
contains:
3.0 moles of oxygen gas,
2.0 moles of helium gas, and
4.0 moles of carbon dioxide gas.
17. What is the partial pressure (in mm Hg)
of neon in a 4.00 L vessel that contains
0.838 mol of methane, 0.184 mol of ethane,
and 0.755 mol of neon at a total pressure of
928 mmHg? (3 pts)
18. What is the rms speed of methane
molecules at 45.0 °C? (1 pt)
What is the partial pressure of helium
gas, PHe.? (3 pts)
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19. A fixed amount of gas at 25.0 °C
occupies a volume of 10.0 L when the
pressure is 629 torr. Calculate the volume
(L) the gas will occupy when the temperature
is increased to 125.0 °C, while maintaining
the pressure at 629 torr. (3pts)
Bonus 1. A gas at 20 atm pressure with a
volume of 2.0 Liters expands against a 5 atm
pressure to a volume of 8.0 Liters. How
much work is done by the gas
20. Calcium hydride (CaH2) reacts with water
to form hydrogen gas:
Bonus #2: In the presence of excess
oxygen, methane gas burns in a constantpressure system to yield carbon dioxide and
water:
CaH2 (s) + 2H2O (l) → Ca(OH)2 (aq)
+ 2H2 (g)
How many grams of
are needed to
generate 48.0 L of
gas at a pressure of
0.888 atm and a temperature of 32 °C?
(3pts)
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O(l)
△H = -890 kJ
Calculate the value of q (kJ) in this
exothermic reaction when 1.70 g of methane
is combusted at constant pressure.
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