Transcript Document

Clicker Questions
Chapter 5
Gases
Allison Soult
University of Kentucky
© 2014 Pearson Education, Inc.
A chamber has a pressure of 1.5 atm at a volume of
1.4 L. What is the pressure when the piston
compresses the sample to a volume of 0.60 L?
a)
b)
c)
d)
e)
3.5 L
0.64 L
1.8 L
1.6 L
0.29 L
© 2014 Pearson Education, Inc.
The volume of O2 gas in a balloon at 1.0 atm and 305 K
is 0.65 L. Calculate the volume of the gas after the
temperature is lowered to 77 K while keeping the
pressure and amount of O2 constant.
a)
b)
c)
d)
e)
0.16 L
0.65 L
2.8 × 10–5 L
3.6 × 104 L
Not enough
information
© 2014 Pearson Education, Inc.
How many moles of helium are found in a balloon that
contains 5.5 L of helium at a pressure of 1.15 atm and a
temperature of 22.0 ºC?
a)
b)
c)
d)
e)
3.5
0.26
2.6
0.35
3.8
© 2014 Pearson Education, Inc.
A 0.49 mol sample of oxygen is in a 4.8 L container at
25 ºC. What is the pressure in the container?
a)
b)
c)
d)
254 atm
8.6 atm
2.5 atm
0.40 atm
© 2014 Pearson Education, Inc.
Which of the following will have the greatest volume
at STP?
a)
b)
c)
d)
e)
5.0 g H2
5.0 g N2
5.0 g O2
5.0 g CO
All of the above
have the same
volume.
© 2014 Pearson Education, Inc.
The four most common gases in the atmosphere are
N2, O2, Ar, and CO2. Assuming all gases are in
containers of equal size, temperature, and pressure,
which gas has the highest density?
a)
b)
c)
d)
e)
All have the same density
N2
O2
Ar
CO2
© 2014 Pearson Education, Inc.
A 3.50 g sample of a diatomic gas in a 1.5 L container
has a pressure of 2.42 atm at 355 K. Determine the
identity of the gas.
a)
b)
c)
d)
e)
H2
N2
Cl2
O2
F2
© 2014 Pearson Education, Inc.
What is the partial pressure of oxygen in a mixture
that contains 0.30 moles of O2, 0.70 moles of N2, and
0.25 moles of Ar with a total pressure of 1.1 atm?
a)
b)
c)
d)
e)
0.33 atm
0.26 atm
0.35 atm
0.30 atm
0.80 atm
© 2014 Pearson Education, Inc.
A gas phase mixture of H2 and N2 has a total pressure
of 784 torr with an H2 partial pressure of 124 torr. What
mass of N2 gas is present in 2.00 L of the mixture
at 298 K?
a)
b)
c)
d)
e)
0.0133 g
0.0710 g
0.374 g
0.994 g
1.99 g
© 2014 Pearson Education, Inc.
Acetylene may be produced from the reaction between
calcium carbide and water. How many moles of
acetylene are present in a 500.0 mL sample of gas
collected over water at 20.0 ºC and a total pressure of
758 torr? The vapor pressure of water at 20.0 ºC is
17.54 mm Hg.
a)
b)
c)
d)
e)
0.0207
0.0203
15.4
0.297
0.304
© 2014 Pearson Education, Inc.
What mass of water vapor is produced from the gas
phase reaction of O2 with H2 in a 2.5 L container at
28 ºC if the partial pressures of O2 and H2 are
PO2 = 0.98 atm and PH2 = 1.24 atm?
2 H2 (g)+ O2 (g)→ 2 H2O (g)
a)
b)
c)
d)
e)
1.79 g
2.25 g
3.57 g
4.51 g
5.82 g
© 2014 Pearson Education, Inc.
The four most common gases in the atmosphere are
N2, O2, Ar, and CO2. Which gas has the highest
average kinetic energy at room temperature?
a)
b)
c)
d)
e)
N2
O2
Ar
CO2
All have the same
average kinetic energy.
© 2014 Pearson Education, Inc.
Which of the following will have the greatest rootmean-square velocity at 300 K?
a)
b)
c)
d)
N2
O2
CO2
SO2
© 2014 Pearson Education, Inc.
The rate of effusion of A is four times the rate of B.
Which best describes the ratio of their molar masses?
a) A has the same molar mass of B.
b) The molar mass of B is
twice that of A.
c) The molar mass of B is
four times that of A.
d) The molar mass of B is
sixteen times that of A.
© 2014 Pearson Education, Inc.
Under what conditions would Cl2 gas be the
least ideal?
a)
b)
c)
d)
High pressure and low temperature
High pressure and high temperature
Low pressure and high temperature
Low pressure and low temperature
© 2014 Pearson Education, Inc.