Name: Jun Vo
Date: 0 /LL
ACP Gases Quiz
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
C 1) Identify the statement that is not part of the kinetic-molecular theory.
a. Gases consist of molecules in continuous, random motion. x
b. Attractive and repulsive forces between gas molecules are negligible.x
Atoms are neither created nor destroyed by ordinary chemical reactions.
d. The volume occupied by all of the gas molecules in a container is negligible compared to the
volume of the container.
D 2 )
Collisions between gas molecules do not result in the loss of energy.
A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this
_L at 423 K and 1.00 atm.
E 3 )
A pressure of 1.25 atm is the same as a pressure of
A balloon originally had a volume of 4.39 L at 44 C and a pressure of 729 mm Hg. The balloon
must be cooled to
C to reduce its volume to 3.78 L (at constant pressure).
d. 273 ( K
12 5 )
A gas at a pressure of 325 mm Hg exerts a force of
N on an area of 5.5 m.
1.8 x 103
2.4 x 105.
The van der Waals equation for real gases recognizes that the
a. gas particles have non-zero volumes and interact with each other
b. non-zero volumes of gas particles decrease the amount of quot;empty spacequot; between them
molar volumes of gases of different types are different
molecular attractions between particles of gas decreases the pressure exerted by the gas
all of the above statements are true
Arrange the following gases in order of increasing average molecular speed at 25 .C:
He, O2, CO2, N2.
CO2 lt; He lt; N2 lt; O2
c. He lt; O2 lt; N2 lt; CO2
e. He lt; N2 lt; 02 lt; CO2
CO2 lt; N2 lt; 02 lt; He
d. CO2 lt; 02 lt; N2 lt; He
( 8 )
Of the following gases,
has a density of 2.104 g/L at 303 K and 1.31 atm.
Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn(s) + H2SO4(aq) – ZnSO4(aq) + H2(g)
In an experiment, 225 mL of wet H2 is collected over water at 27C and a barometric pressure of 748
mm Hg. How many grams of Zn have been consumed? The vapor pressure of water at 27 C is 26.74
b. 4.79 x 106
c. 4.31 x 105
( 10) Since air is a mixture, it does not have a quot;molar mass.quot; However, it is possible to speak of its
e. ) 0.567
quot;effective molar mass.quot; (An effective molar mass is a weighted average of the molar masses of a
mixture’s components.) If air at STP has a density of 1.285 g/L, its effective molar mass is