TEAR THIS SHEET OFF
THIS IS YOUR SCRATCH PAPER
Faraday’s constant = 9.6485 x 104
R = 8.3145
J
K mol
Grxn = -nFE°
Grxn = -RTlnK
page 1
J
V mol
Name________________________________
Chemistry 112
Spring 2009
CLS
EXAM IV
____________________________________________________________________________________________________________
100 points Show all your work. There are 8 pages to this exam (including the top sheet)
SHOW ALL YOUR WORK . NO WORK NO CREDIT
(4 points) 1] Indicate if
a. I (g)
S is positive or negative and if the rxn is spontaneous or nonspontaneous for the following:

b. C6H12O6(s)
I2 (s)

C6H12O6(aq)
(9 points) 2] The decomposition of SO2Cl2 is shown to have : Rate = k[SO2Cl2] :
SO2Cl2 ----> SO2 + Cl2
-3
-1
-3
-1
The rate constant for the reaction is 2.8 x 10 min at 600. K. If the initial concentration of SO2Cl2 is 1.24 x 10 mol L , how long will it
take for the concentration to drop to 0.31 x 10-3 mol L-1 ?
2
Answer: 5.0 x 10 min
page 2
page 3
(26 pts) 4] Complete the following reactions. Draw structural formulas for the reactants and products
YOU DO NOT NEED TO NAME YOUR STRUCTURES
[O]
a.
b.
c.
-------------->
2-Pentanol
Benzene
+
+
Heptanoic Acid
3-Octanol ------->
Cl2
------->
page 4
d.
e.
2-methylpropane + I2
------->
4,4-diethyl-3-isopropyl-1-decene + H2
------->
K2Cr2O7
f.
3-methyl-4-propyl-3-octanol
----------->
page 5
(8 pts) 5] Draw all the isomers for CH3CH2CH=CClCH3
(8 pts) 6]
Calculate the
G for:
ZrO2
+
4H+
-
4e

Zr
+
2 H2O
Eo
=
-1.473 V
2
Answer: 5.6 x 10 KJ
Is this a spontaneous reaction?__________
(8 points) 7] Use bond energies to estimate
H for the following reaction:
C5H8Cl2 (g)
+
F2 (g) 
page 6
C5H8Cl2F2 (g)
(15 points) 8] Calculate The rate law, rate constant and rate order. Given:
W + X 2 + Z ---> E + F
Experiment
1
2
3
4
5
6
[W]
0.0010
0.0020
0.0060
0.0060
0.0010
0.0010
Initial Conc.
[X2]
0.005
0.005
0.002
0.004
0.001
0.001
a) Rate Law
b) Rate Constant
-3
Answer: k = 1 M sec
c) Rate Order
page 7
[Z]
0.001
0.001
0.001
0.001
0.001
0.002
Initial Rate
[mol/L sec]
1.25 x 10-10
2.50 x 10-10
4.8 x 10-11
3.84 x 10-10
1.00 x 10-12
1.00 x 10-12
(12 points) 9] For the Reaction:
Eqn 1
Eqn 2
I2 ---> 2 I
I + X2 ---> X2I
Eqn 3
I + X2I ---> 2 XI
Below is the proposed Energy diagram for the above reaction. Complete the energy diagram below and then use the energy diagram to answer the
following:
a. What is the overall reaction?
b. What is the rate determining step?
d. What is the rate equation?
page 8
(9 points) 9] Complete the following:
a.
Po-207 decays to Bi-207 and gamma radiation
b.
Pa-231 undergoes alpha emission
c.
Cl-37 is formed by electron capture
(4 points) 10]
a. How stable would you predict Ca-40 isotope to be? Why?
b. The nuclear rxn:
202
Hg + n → 203Tl is an example of what type of nuclear rxn?
page 9