Question 1
Figure 1: Data from a differential reactor. |
Which of the following best describe the data in the above figure?
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Assume the reaction is irreversible |
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What can you tell from the above figures? |
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The following data were reported for the reaction
A | B |
C | D |
Which of the following mechanism is consistent with the above data
(a) | (b) | (c) |
(d) | (e) | |
Question 4
The initial rate of reaction is shown below
(a) | (b) | (c) |
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Question 5
The initial rate of reaction is shown below
1. The rate law is
For the reaction from Self Tests 12 and 13 we found
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which mechanism is consistent with the rate law
If the reaction is reversible the increase in PC will decrease the rate. If C is on the surface it will be in the denomination of the rate law and thus increasing PC will decrease the rate. Ans: C |
A is not on the surface or if it is KAPA << 1. B is on the surface and we see as we increase PB, the rate reaches a plateau. The curves from A, B, and C partial pressure suggest a rate law of the for |
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Figure 1 |
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Figure 2 |
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Figure 3 |
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Combining |
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Possible Mechanism |
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From the rate law we know species B and C are adsorbed on the surface. From the data you can’t tell whether or not C is adsorbed on the surface. |
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Ans: E |
Recall |
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Figure (a) suggests |
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Figure (b) suggests |
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Figure (c) suggests |
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therefore reaction is irreversible and D is not on surface |
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Figure (d) suggests |
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Combining all the above |
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Therefore (b) is consistent |
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1. The reaction is irreversible because when PB = 1 atm, increasing the product C does not change the rate. (TRUE) |
2. Species B is on the surface because in 1 we showed that the reaction is irreversible, therefore the only way the rate could decrease were if were in the denominator of the rate law. If a species is in the denominator of the rate law it’s on the surface. (TRUE) |
3. Species C is not on the surface because increasing PC does not affect the rate.(FALSE) |
Ans: A |
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Low PT |
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High PT |
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Combining |
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Ans: (c) |
Ans: (e)