Answer Key for D2L Assignment #1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Q1
Consider the following reaction
8A(
g
) + 5B(
g
)
→
8C(
g
) + 6D(
g
)
If [C] is increasing at the rate of 4.0 mol L
1
s
1
, at what rate is [B] changing?
1) 2.5 mol L
1
s
1
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Difficulty: M
2) 0.40 mol L
1
s
1
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Difficulty: M
3) 4.0 mol L
1
s
1
Feedback:
Difficulty: M
4) none of the above, since its rate of change must be positive
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Difficulty: M
5) 6.4 mol L
1
s
1
Feedback:
Difficulty: M
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Q2
The rate constant for a reaction is 4.65 L mol
1
s
1
. What is the overall order of the reaction?
1) More information is needed to determine the overall order.
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Difficulty: M
2) second
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Difficulty: M
3) third
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4) first
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5) zero
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Difficulty: M
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Q3
When the reaction A
→
B + C is studied, a plot of ln[A] vs. time gives a straight line with a negative slope.
What is the the order of the reaction?
1) zero
Feedback:
Difficulty: E
2) More information is needed to determine the order.
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 Spring '08
 Chesson
 Difficulty, Rate equation, cyclopropane, 0.800 L

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