A certain compound, A, reacts to form products according to the reaction
Time(s) | 25.0°C [A] (M) | 35.0°C [A] (M) | 45.0°C [A] (M) |
0 | 1.000 | 1.000 | 1.000 |
10 | 0.779 | 0.662 | 0.561 |
20 | 0.591 | 0.461 | 0.312 |
30 | 0.453 | 0.306 | 0.177 |
40 | 0.338 | 0.208 | 0.100 |
50 | 0.259 | 0.136 | 0.057 |
60 | 0.200 | 0.093 | 0.032 |
Have one group member make a graph of [A] versus t, one group member make a graph of ln[A] versus t, and one group member make a graph of 1/[A] versus t using the data for 25°C. Additional group members can make similar graphs for the other temperatures. What is the order of the reaction with respect to A? Explain your answer.
a. Use the data to determine the rate constant at each temperature.
b. What is the activation energy for this reaction?
c. The same reaction is conducted in the presence of a catalyst, and the following data are obtained:
Time(s) | 25.0°C [A] (M) | 35.0°C [A] (M) | 45.0°C [A] (M) |
0 | 1.000 | 1.000 | 1.000 |
0.1 | 0.724 | 0.668 | 0.598 |
0.2 | 0.511 | 0.433 | 0.341 |
0.3 | 0.375 | 0.291 | 0.202 |
0.4 | 0.275 | 0.190 | 0.119 |
0.5 | 0.198 | 0.122 | 0.071 |
0.6 | 0.141 | 0.080 | 0.043 |
What effect does a catalyst have on the
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