WorksheetsCh 11 Assessment Review
Total questions: 25
Worksheet time: 13mins
The SI unit of pressure is
newtons
pascals
atmospheres
torr
Most manometers and barometers contain
water
alcohol
mercury
oil
Pressure =
force x area
force/area
force
area / force
The unit of pressure known as the pascal is equal to
14.700 psi
760 mm Hg
1 atm
1 N/m2
Air is about 78% nitrogen, 21% oxygen, and 1% other gases. After all the oxygen is removed from a sample of air in a glass tube and the temperature remains constant, the pressure exerted by the remaining air
does not change
is reduced by 78%
is reduced by 50%
is reduced by 21%
Which graph illustrates Boyle’s law?
None of the graphs
The law that relates the temperature and volume of a gas to each other is known as
Charles’s law
Boyle’s law
Gay-Lussac’s law
Graham’s law
Gay-Lussac recognized that at constant temperature and pressure, the volumes of gaseous reactants and products
can be expressed as ratios of small whole numbers
add up to 22.4 L
equal R
always equal 1 L
Which of the following expressions relates the kelvin and Celsius temperature scales?
K = 273.15 + °C
K = −273.15 + °C
°C = 273.15 K
K = 273.15°C
At constant temperature and pressure, gas volume is directly proportional to the
molar mass of the gas
number of moles of gas.
density of the gas at STP
rate of diffusion.
What is the conversion factor that should be used to determine the number of moles of a gas at STP when you are given the volume of the gas?
1 mol22.4 L
22.4 L1 mol
6.022 x 102322.4 L
22.4 L6.022 x 1023
The ratios of the volumes of the gaseous reactants and products in a chemical reaction at constant temperature and pressure can be determined from the
formulas
coefficients in the balanced equation
subscripts in the balanced equation
gas constant
For the balanced equation 2CO(g) + O2(g) → 2CO2(g), the ratio 2:1:2 refers to all the following except
volumes
moles
molecules
pressures
The law of combining volumes applies only to gas volumes
measured at constant temperature and pressure
that equal 1 L
that equal 22.4 L
measured at STP
According to Avogadro’s law, 1 L of H2(g) and 1 L of O2(g) at the same temperature and pressure
have the same mass
have the same molar mass
contain 1 mol of gas each
contain equal numbers of molecules
The passage of gas particles through a small opening is called
diffusion
pressurization
effusion
vaporization
Which of these gases effuses the slowest under the same conditions
Ne
NH3
NO2
CO2
In the figure to the left, the curve that represents an ideal gas is curve
A
B
C
D
Gases tend to deviate from the ideal gas law at
high pressures
low pressures
high temperatures
low pressures and high temperatures
A 10.2-L canister of oxygen gas contains 58.6 mol of gas at a temperature of 25.0°C. What is the pressure of the gas? (R=0.0821)
7.11 X 10− 3 atm
8.48 X 10− 2 atm
11.8 atm
141 atm
Hydrogen gas is collected by water displacement. If the barometric pressure is 752.0 torr and the water vapor pressure is 17.5 torr, what is the partial pressure of the hydrogen collected?
769.5 torr
752.0 torr
734.5 torr
17.5 torr
A sample of helium gas has a volume of 250.0 mL when its pressure is 0.935 atm. If the temperature remains constant, what will the pressure of the gas be when it has a volume of 175.0 mL?
1.34 atm
1.00 atm
0.935 atm
0.654 atm
You collect 552 mL of argon gas at 23.0°C. What volume will the gas occupy at 46.0°C if the pressure remains constant?
276 mL
512 mL
595 mL
1104 mL
The gas in an aerosol container is at a pressure of 3.50 atm at 24.0°C. The caution on the container warns against storing it at temperatures above 95°C. What would the gas pressure in the container be at 95°C?
4.34 atm
8.68 atm
13.9 atm
84.0 atm
What is the ratio of the rate of effusion of helium (atomic mass 4.00 amu) to that of oxygen gas (molecular mass 32.0 amu)?
0.125
0.354
2.83
8.00
