1
Chem340
Physical Chemistry for Biochemists
Exam 1
Feb 11, 2011
Your Name
_
I affirm that I have never given nor received aid on this examination.
I understand that
cheating in the exam will result in a grade F for the class.
Signature
.
Sec 1
Multiple Choice
[
/42]
Sec 2
Calculation/MC
[
/24]
Sec 3
Long Question
[
/40]
Sec 4
Derivation
[
/10]
Total
[
/100]
Total points are 124 points.
If you score more than 100, you will receive 100 points.

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2
Multiple Choice Questions
(Some questions may be similar to those one in quiz, but not the same)
Each 3 points [
/42]
Q1
.
Which of the following P-V cycles has the largest work in absolute value (namely,
|w|
)?
Assume
that P
ext
= P
int
. Choose all the correct answers
.
(a) [P (bar),V (L) ]
[1, 1]
[1, 3]
[3, 3]
[3, 1]
[1, 1]
(b) [P (bar),V (L) ]
[1, 1]
[3, 1]
[3, 3]
[1, 3]
[1, 1]
(c) Isothermal compression from [P (bar),V (L)] of [3, 1] to [1, 3] and then isothermal expression from
[1, 3] to [3, 1]
(d) Isothermal compression from [P (bar),V (L)] of [1, 3] to [3, 1]. Then, [P,V] =[3, 1]
[3, 3]
[1, 3]
Q2.
Select two correct statements from the following choices.
(a) “Equilibrium” means the situation in which a system parameter reaches constant over time in any
part of the systems
(b) “Equilibrium” means the situation in which a system parameter reaches constant over time in some
parts of the systems
(c) The zeroth law of thermodynamics states that when two systems are separately in thermal
equilibrium with the third system, these two systems are also in thermal equilibrium
(d) The first law of thermodynamics is equivalent to the fact that no heat is generated in the reversible
process.
(e) In a reversible process, P
ext
= -P
int
Q3.
Calculate the average translational energy <mv
2
/2> for
one molecule
of H
2
O
assuming that it is
an ideal gas, where m is a mass of the molecule and v is a velocity.
Choose the closet from the choices
(a- h) below.
(a) 0,
(b) RT/2
(b) k
B
T/2
(c) RT
(d) k
B
T
(e) 3RT/2
(f)
3k
B
T/2
(g)
3RT
(h) 3k
B
T
Q4.
What is expected heat capacity at a constant volume C
V
per
one mole
of CO
at T = 200K
(neglecting the vibrational energy)?
Choose the closest.
(i) 3k
B
T
(j) 3R
(e) 3k
B
Q5.
A total differential of H, dH is given in the following form when P and T are independent
variables:
BdT
AdP
dH
.
Which of the following statement is correct on A and B?
Select ALL choices that are correct.
P
T
V
T
V
P
T
V
T
V
Pfin
Pin
T
dP
T
P
B
U
)
,
(