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Name _____________________________________
KEY
Last 5 digits of Student Number: XXX – X ___ –
___ ___ ___ ___
Chem 116
Sample Examination #2
This exam consists of eight (8) pages, including this cover page. Be sure your copy is complete
before beginning your work. If this test packet is defective, ask for another one.
A copy of the Periodic Table is attached at the back of the exam. You may remove it and use the
back side of the Periodic Table as scratch paper. No work on scratch paper will be graded or
collected.
The following information may be useful:
Equations
More Equations
Arrhenius equation:
TR
E
a
eA
k
±
k
t
half
693
.
0
for a firstorder reaction
Constants of nature
R
= 8.314
= 0.08206
K
mol
atm
L
x
x
Differential rate laws:
0.
rate of change of [A] =
k
[A]
0
1.
rate of change of [A] =
k
[A]
1
2.
rate of change of [A] =
k
[A]
2
Integrated rate laws:
0.
[A] = [A]
o
+
k
t
1.
> @ > @
tk
±
o
A
ln
A
ln
2.
>@
²
o
A
1
A
1
K
mol
J
x
DO NOT WRITE BELOW THIS LINE
Part I:
Q
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s
1

7
Q
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e
s
t
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n
8
Q
u
e
s
t
i
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n
9
Q
u
e
s
t
i
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n
1
0
_________ (maximum 35)
_________ (maximum 7)
_________ (maximum 8)
_________ (maximum 10)
Part II:
Q
u
e
s
t
i
o
n
1
Q
u
e
s
t
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o
n
2
E
x
t
r
a
c
r
e
d
i
t
_________ (maximum 20)
_________ (maximum 20)
_________ (maximum 2)
Total (out of 100)
Disclaimer:
This is a copy of a typical Exam 2 given in
Chem 116 during the academic year. Your
test will be different. This test is being posted
to give you a sense of the format, style, scope
and level of a typical test on this material.
This test may have questions on topics that
may not be covered on your exam.
Moreover, your test may have questions on
topics not covered in this practice exam.
Posting this test in no way limits the format,
style, scope and level of the test that you will
take. Do not limit your preparation to the
material in this practice exam.
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Part I. MultipleChoice or Short Response
There are 10 questions. Questions 17 are multiplechoice and are each worth 5 points. Question 8 is
worth 7 points. Question 9 is worth 8 points. Question 10 is worth 10 points.
1. An aqueous solution contains 2.05 g of an unknown, nonionic solute in 50.0 g of water. The
solution boils at 100.062 ºC. What is the molar mass of the unknown solute? The boiling point
constant for water is 0.5121 ºC/
m
.
A
A) 340 g/mol
mK
iT
bp
bp
'
and the solute is nonionic so
i
= 1
B) 1290 g/mol
m
=
±²
¸
¹
·
¨
©
§
m
C
5121
.
0
1
C
062
.
0
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 Spring '11
 Staff

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