[问答题]
The enzyme carbonic
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$CO_2(aq)$+$H_2O(l)$→$H_2CO_3(aq)$
1.State one reason that the use of an enzyme causes the rate constant to increase.
2.The rate constant was measured over a range of temperatures. Three of the measurements are shown in the table.
| Temperature/$^{\circ}C$ | $\kappa$/$s^{-1}$ |
| 20 | $6.0\times 10^{5}$ |
| 40 | $1.5\times 10^{6}$ |
| 80 | $1.2\times 10^{5}$ |
Explain why the rate constant changes as the temperature increases.
3.Consider the plot of $ln$($\kappa$) against $\frac{1}{T}$ for this reaction.
Use the graph and sections 1 and 2 of the data booklet to calculate the activation energy,$E_a$,in $kJ$ $mol^{-1}$
