Consider the following set of reactions and the related kinetics data. The reaction conditions and initial reactant concentrations were the same for all three reactions. Select the one statement that is FALSE. Reaction Rate Law Rate constant, k (M-1s-1) CH3F + SCN¯ → CH3SCN + F¯ Rate = k [CH3F] [SCN¯] k = 8.3 x 10-14 CH3Cl + SCN¯ → CH3SCN + Cl¯ Rate = k [CH3Cl] [SCN¯] k = 2.5 x 10-4 CH3I + SCN¯ → CH3SCN + I¯ Rate = k [CH3I] [SCN¯] k = 1.5
Consider the following set of reactions and the related kinetics data. The reaction conditions and initial reactant concentrations were the same for all three reactions. Select the one statement that is FALSE.
|
Reaction |
Rate Law |
Rate constant, k (M-1s-1) |
|
CH3F + SCN¯ → CH3SCN + F¯ |
Rate = k [CH3F] [SCN¯] |
k = 8.3 x 10-14 |
|
CH3Cl + SCN¯ → CH3SCN + Cl¯ |
Rate = k [CH3Cl] [SCN¯] |
k = 2.5 x 10-4 |
|
CH3I + SCN¯ → CH3SCN + I¯ |
Rate = k [CH3I] [SCN¯] |
k = 1.5 x 10-2 |
OPTIONS:
| A) |
Increasing the temperature by 20ºC will increase all three reaction rates by the exact same amount. |
| B) |
Doubling the concentration of SCN¯ will double the reaction rate. |
| C) |
It is possible that each reaction occurs in one elementary step. |
| D) |
Each of these reactions is second order overall and first order with respect to SCN¯. |
| E) |
The reaction with CH3I as the reactant will produce CH3SCN the fastest initially. |
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