Chem 20L – Lecture 1 – Gould
Midterm Exam #2 (Winter 2008)
NAME:
_____________________________________________________________________________
(LAST NAME)
(FIRST NAME)
ID #:
__________________________
Section
(circle)
1A (T
811, James)
1F (Th 112, James)
1B (T 25, Kevin)
1G (Th 112, Kristina)
1C (T 6:309:20, Kevin)
1H (Th 25, Eunshil)
1D (W, 25, Kristina)
1I
(Th 6:309:20, Mikhail)
1E (Th 811, Eunshil)
1J (F 25, Mikhail)
DO NOT OPEN THE EXAM UNTIL YOU ARE INSTRUCTED TO DO SO.
READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
INSTRUCTIONS
1. This is a closed book and closed note exam.
You may use your 4 x 6 note card during the exam.
The
last two pages of the exam are common equations that might be helpful.
2. Calculators are allowed.
3. Use
PEN
to answer
ALL
questions. You will not be allowed a regrade if you use pencil for
ANY
part
of the exam.
4. There are a total of 5 pages of questions.
5. Show
all
work for all calculations in order to receive full credit.
No credit will be given for a
numerical answer alone or for an illegible answer.
7. You must provide
correct units
and
significant figures
.
8.
Place a box or circle around your final calculated answer.
Page
Value
Max. Score
2
20
3
15
4
20
5
10
6
15
Total
80
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a
2
I. Chemical Kinetics
Consider the following data:
X + Y
!
Z
Initial Concentration
Initial Rate
X
Y
0.21 M
0.70 M
6.3 M/sec
0.21 M
1.39 M
11.5 M/sec
0.41 M
0.70 M
12.4 M/sec
(A) (12 Points)
Deduce the order of the reaction with respect to each reactant.
Limit your answer to 23
sentences
With respect to X
**Must compare trials when [X] doubles and [Y] is held constant**
Can visual compare rates above and see that when [X] doubles the rate also doubles, order must be
1
rate
1
= k[X
1
]
a
[Y
1
]
b
{k and Y cancel}
6.3
=
[0.21]
a
rate
2
k[X
2
]
a
[Y
2
]
b
12.4
[0.41]
a
a = 1.01 rounded to 1 (because order must be an integer value)
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 Winter '08
 Gould
 Chemistry, Mikhail, Eunshil

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