Ch18

1
Chapter 18
2
The table shows the properties of four gases,
each having the same number of molecules. Rank in
order, from largest to smallest, the mean free
paths of molecules in these gases.
Gas A B C D
Volume V 2V V V
Atomic mass m m 2m m
Atomic radius r r r 2r
3
The table shows the properties of four gases,
each having the same number of molecules. Rank in
order, from largest to smallest, the mean free
paths of molecules in these gases.
Gas A B C D
Volume V 2V V V
Atomic mass m m 2m m
Atomic radius r r r 2r
4
The speed of every molecule in a gas is suddenly
increased by a factor of 4. As a result, vrms
increases by a factor of
1. 16. 2. gt4 but not necessarily 16. 3. 4. 4.
lt4, but not necessarily 2. 5. 2.
5
The speed of every molecule in a gas is suddenly
increased by a factor of 4. As a result, vrms
increases by a factor of
1. 16. 2. gt4 but not necessarily 16. 3. 4. 4.
lt4, but not necessarily 2. 5. 2.
6
Which system has the largest average
translational kinetic energy per molecule?
1. 1 mol of He at p 1 atm, T 300 K 2. 2 mol
of N2 at p 0.5 atm, T 450 K 3. 2 mol of He at
p 2 atm, T 300 K 4. 1 mol of Ar at p 0.5
atm, T 450 K 5. 1 mol of N2 at p 0.5 atm, T
600 K
7
Which system has the largest average
translational kinetic energy per molecule?
1. 1 mol of He at p 1 atm, T 300 K 2. 2 mol
of N2 at p 0.5 atm, T 450 K 3. 2 mol of He at
p 2 atm, T 300 K 4. 1 mol of Ar at p 0.5
atm, T 450 K 5. 1 mol of N2 at p 0.5 atm, T
600 K
8
How many degrees of freedom does a bead on a wire
have?
1. 1 2. 2 3. 3 4. 4 5. 5
9
How many degrees of freedom does a bead on a wire
have?
1. 1 2. 2 3. 3 4. 4 5. 5
10
Systems A and B are interacting thermally. At
this instant of time,
1. TA TB. 2. TA gt TB. 3. TA lt TB.
11
Systems A and B are interacting thermally. At
this instant of time,
1. TA TB. 2. TA gt TB. 3. TA lt TB.
12
Two identical boxes each contain 1,000,000
molecules. In box A, 750,000 molecules happen to
be in the left half the box while 250,000 are in
the right half. In box B. 499,900 molecules
happen to be in the left half the box while
500,100 are in the right half. At this instant of
time,
1. The entropy of box A is smaller than the
entropy of box B. 2. The entropy of box A is
equal to the entropy of box B. 3. The entropy of
box A is larger than the entropy of box B.
13
Two identical boxes each contain 1,000,000
molecules. In box A, 750,000 molecules happen to
be in the left half the box while 250,000 are in
the right half. In box B. 499,900 molecules
happen to be in the left half the box while
500,100 are in the right half. At this instant of
time,
1. The entropy of box A is smaller than the
entropy of box B. 2. The entropy of box A is
equal to the entropy of box B. 3. The entropy of
box A is larger than the entropy of box B.
14
Chapter 18 Reading Quiz
15
What is the name of the quantity represented as
vrms?
1. random-measured-step viscosity 2.
root-mean-squared speed 3. relative-mean-system
velocity 4. radial-maser-system volume
16
What is the name of the quantity represented as
vrms?
1. random-measured-step viscosity 2.
root-mean-squared speed 3. relative-mean-system
velocity 4. radial-maser-system volume
17
What additional kind of energy makes CV larger
for a diatomic than for a monatomic gas?
1. Charismatic energy 2. Translational energy 3.
Heat energy 4. Rotational energy 5. Solar energy
18
What additional kind of energy makes CV larger
for a diatomic than for a monatomic gas?
1. Charismatic energy 2. Translational energy 3.
Heat energy 4. Rotational energy 5. Solar energy
19
The second law of thermodynamics says that
1. the entropy of an isolated system never
decreases. 2. heat never flows spontaneously from
cold to hot. 3. the total thermal energy of an
isolated system is constant. 4. both 1 and 2. 5.
both 1 and 3.
20
The second law of thermodynamics says that
1. the entropy of an isolated system never
decreases. 2. heat never flows spontaneously from
cold to hot. 3. the total thermal energy of an
isolated system is constant. 4. both 1 and 2. 5.
both 1 and 3.
21
In general,
1. both microscopic and macroscopic processes are
reversible. 2. both microscopic and macroscopic
processes are irreversible. 3. microscopic
processes are reversible and macroscopic
processes are irreversible. 4. microscopic
processes are irreversible and macroscopic
processes are reversible.
22
In general,
1. both microscopic and macroscopic processes are
reversible. 2. both microscopic and macroscopic
processes are irreversible. 3. microscopic
processes are reversible and macroscopic
processes are irreversible. 4. microscopic
processes are irreversible and macroscopic
processes are reversible.