Transcript 10_GiveItSomeThought.pptx

Give It Some Thought
Clicker Questions
Chapter 10
GASES
Lynn Mandeltort
Auburn University
© 2015 Pearson Education, Inc.
Xenon is the heaviest stable noble gas with a molar
mass of 131 g/mol. Do any of the gases listed in
Table 10.1 have molar masses larger than Xe?
a. Yes
b. No
© 2015 Pearson Education, Inc.
© 2015 Pearson Education, Inc.
Xenon is the heaviest stable noble gas with a molar
mass of 131 g/mol. Do any of the gases listed in
Table 10.1 have molar masses larger than Xe?
a. Yes
b. No
© 2015 Pearson Education, Inc.
Assume the top of your head has a surface area of
25 cm × 25 cm. How many pounds of air are you
carrying on your head if you are at sea level?
a. 100 kPa/100 in.2
b. 1x 105 N × 100 in.2
c. 14.7 psi × 100 in.2
d. 14.7 psi/100 in.2
© 2015 Pearson Education, Inc.
Assume the top of your head has a surface area of
25 cm × 25 cm. How many pounds of air are you
carrying on your head if you are at sea level?
a. 100 kPa/100 in.2
b. 1x 105 N × 100 in.2
c. 14.7 psi × 100 in.2
d. 14.7 psi/100 in.2
© 2015 Pearson Education, Inc.
What happens to the pressure of a gas in a closed
container if you double its volume while its
temperature is held constant?
a. Increases by doubling its original value
b. Increases by tripling its original value
c. Decreases to half of its original value
d. Decreases to a fourth of its original value
© 2015 Pearson Education, Inc.
What happens to the pressure of a gas in a closed
container if you double its volume while its
temperature is held constant?
a. Increases by doubling its original value
b. Increases by tripling its original value
c. Decreases to half of its original value
d. Decreases to a fourth of its original value
© 2015 Pearson Education, Inc.
Does the volume of a fixed quantity of gas decrease
to half its original value when the temperature is
lowered from 100 °C to 50 °C?
a. Yes, because the temperature decreases by half.
b. No, because the temperature in kelvin (K) does not
decrease by half.
© 2015 Pearson Education, Inc.
Does the volume of a fixed quantity of gas decrease
to half its original value when the temperature is
lowered from 100 °C to 50 °C?
a. Yes, because the temperature decreases by half.
b. No, because the temperature in kelvin (K) does not
decrease by half.
© 2015 Pearson Education, Inc.
If 1.00 mol of an ideal gas at STP were confined to a
cube, what would be the length in cm of an edge of
this cube?
a. (22,410)1/3 cm
b. (22.41)1/3 cm
c. (2.241)1/3 cm
d. (0.02241)1/3 cm
© 2015 Pearson Education, Inc.
If 1.00 mol of an ideal gas at STP were confined to a
cube, what would be the length in cm of an edge of
this cube?
a. (22,410)1/3 cm
b. (22.41)1/3 cm
c. (2.241)1/3 cm
d. (0.02241)1/3 cm
© 2015 Pearson Education, Inc.
Is water vapor more or less dense than N2 under the
same conditions of temperature and pressure?
a. More dense
b. Less dense
© 2015 Pearson Education, Inc.
Is water vapor more or less dense than N2 under the
same conditions of temperature and pressure?
a. More dense
b. Less dense
© 2015 Pearson Education, Inc.
How is the partial pressure exerted by N2 gas affected when
some O2 is introduced into a container if the temperature and
volume remain constant? How is the total pressure affected?
a.
The partial pressure exerted by N2 gas does not change when O2
is added to the container; the total pressure increases.
b.
The partial pressure exerted by N2 gas changes only if an equal or
greater amount of O2 is added to the container; if that condition is
met, the total pressure increases.
c.
The partial pressure exerted by N2 gas decreases when O2 is added
to the container; the total pressure remains the same.
d.
The partial pressure exerted by N2 gas increases when O2 is added
to the container; the total pressure remains the same.
© 2015 Pearson Education, Inc.
How is the partial pressure exerted by N2 gas affected when
some O2 is introduced into a container if the temperature and
volume remain constant? How is the total pressure affected?
a.
The partial pressure exerted by N2 gas does not change when O2
is added to the container; the total pressure increases.
b.
The partial pressure exerted by N2 gas changes only if an equal or
greater amount of O2 is added to the container; if that condition is
met, the total pressure increases.
c.
The partial pressure exerted by N2 gas decreases when O2 is added
to the container; the total pressure remains the same.
d.
The partial pressure exerted by N2 gas increases when O2 is added
to the container; the total pressure remains the same.
© 2015 Pearson Education, Inc.
Consider three gases all at 298 K: HCl, H2, and O2.
List the gases in order of increasing average speed.
a. Additional pressure information is needed to compare
average speeds.
b. HCl < O2 < H2
c. HCl < H2 < O2
d. H2 < O2 < HCl
© 2015 Pearson Education, Inc.
Consider three gases all at 298 K: HCl, H2, and O2.
List the gases in order of increasing average speed.
a. Additional pressure information is needed to compare
average speeds.
b. HCl < O2 < H2
c. HCl < H2 < O2
d. H2 < O2 < HCl
© 2015 Pearson Education, Inc.
What is the ratio of urms to ump for a sample of O2(g)
at 300 K?
a. Sqrt(2/3)
b. 1
c. Sqrt(3/2)
d. Sqrt(2)
© 2015 Pearson Education, Inc.
What is the ratio of urms to ump for a sample of O2(g)
at 300 K?
a. Sqrt(2/3)
b. 1
c. Sqrt(3/2)
d. Sqrt(2)
© 2015 Pearson Education, Inc.
Will this ratio change as the temperature changes?
Will it be different for a different gas?
a. Changes with temperature; changes depending on gas
identity
b. Changes with temperature; does not change depending
on gas identity
c. Does not change with temperature; changes depending
on gas identity
d. Does not change with temperature; does not change
depending on gas identity
© 2015 Pearson Education, Inc.
Will this ratio change as the temperature changes?
Will it be different for a different gas?
a. Changes with temperature; changes depending on gas
identity
b. Changes with temperature; does not change depending
on gas identity
c. Does not change with temperature; changes depending
on gas identity
d. Does not change with temperature; does not change
depending on gas identity
© 2015 Pearson Education, Inc.
Will these changes increase, decrease, or have no
effect on the mean free path of the molecules in a
gas sample?
(a) increasing pressure.
(b) increasing temperature.
Increasing P
Increasing T
a. Increase
Increase
b. Decrease
No change
c. Increase
Decrease
d. No change
Decrease
© 2015 Pearson Education, Inc.
Will these changes increase, decrease, or have no
effect on the mean free path of the molecules in a
gas sample?
(a) increasing pressure.
(b) increasing temperature.
Increasing P
Increasing T
a. Increase
Increase
b. Decrease
No change
c. Increase
Decrease
d. No change
Decrease
© 2015 Pearson Education, Inc.
Under which conditions do you expect helium gas
to deviate most from ideal behavior?
a. 100 K and 1 atm
b. 100 K and 5 atm
c. 300 K and 2 atm
© 2015 Pearson Education, Inc.
Under which conditions do you expect helium gas
to deviate most from ideal behavior?
a. 100 K and 1 atm
b. 100 K and 5 atm
c. 300 K and 2 atm
© 2015 Pearson Education, Inc.
Explain the negative deviation from ideal gas
behavior of N2 below 300 atm in Figure 10.20.
a. Attractive intermolecular forces
b. Repulsive intermolecular forces
© 2015 Pearson Education, Inc.
Explain the negative deviation from ideal gas
behavior of N2 below 300 atm in Figure 10.20.
a. Attractive intermolecular forces
b. Repulsive intermolecular forces
© 2015 Pearson Education, Inc.