obennoskey (blo242) – Prelab 10 – Lyon – (52635)
1
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Multiplechoice questions may continue on
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beFore answering.
001
10.0 points
Consider the mechanism
NO
2
+ ±
2
→
NO
2
± + ±
k
1
, slow
± + NO
2
→
NO
2
±
k
2
, Fast
What is the rate law?
1.
rate =
k
1
[NO
2
±] [±]
2.
rate =
k
2
[NO
2
] [±]
3.
rate =
k
1
k
2
[NO
2
]
2
4.
rate =
k
2
[NO
2
]
2
5.
rate =
k
1
[NO
2
] [±
2
]
002
(part 1 oF 3) 10.0 points
A particular reaction is Found to have the rate
law
R
=
k
[A] [B]
2
How is the rate a²ected
a) iF the initial concentration oF A is cut in
halF?
1.
Rate does not change.
2.
Rate is increased by a Factor oF 2.
3.
Rate is reduced by
1
2
.
4.
Rate is reduced by
1
4
.
5.
Rate is reduced by
1
3
.
6.
Rate is increased by a Factor oF 3.
7.
Rate is reduced by
1
9
.
8.
Rate is increased by a Factor oF 4.
9.
Rate is increased by a Factor oF 9.
003
(part 2 oF 3) 10.0 points
b) iF the initial concentration oF B is tripled?
1.
Rate does not change.
2.
Rate is increased by a Factor oF 3.
3.
Rate is reduced by
1
4
.
4.
Rate is reduced by
1
3
.
5.
Rate is reduced by
1
9
.
6.
Rate is increased by a Factor oF 9.
7.
Rate is increased by a Factor oF 2.
8.
Rate is increased by a Factor oF 4.
9.
Rate is reduced by
1
2
.
004
(part 3 oF 3) 10.0 points
c) iF the initial concentration oF A is doubled,
but the concentration oF B is cut in halF?
1.
Rate is increased by a Factor oF 4.
2.
Rate is reduced by
1
9
.
3.
Rate is increased by a Factor oF 9.
4.
Rate is increased by a Factor oF 3.
5.
Rate is reduced by
1
3
.
6.
Rate is reduced by
1
2
.
7.
Rate is increased by a Factor oF 2.
8.
Rate is reduced by
1
4
.
9.
Rate does not change.
005
10.0 points
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View Full Documentobennoskey (blo242) – Prelab 10 – Lyon – (52635)
2
A reaction mechanism has several steps. The
rate of the overall reaction is equal to
1.
the rate of the slowest step.
2.
the average rates of the steps.
3.
the rate of the fastest step.
4.
the diFerence between the rate of the
fastest step and the rate of the slowest step.
006
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 Spring '10
 MCCORD
 Chemical reaction

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