The enzyme urease catalyzes the reaction of urea,(NH2CONH2), with water to produce carbon dioxide andammonia. In water, without the enzyme, the reaction proceedswith a first-order rate constant of 4.15 x 10-5 s-1 at100 °C. In the presence of the enzyme in water, the reactionproceeds with a rate constant of 3.4 x 104 s-1 at 21 °C.(a) Write out the balanced equation for the reaction catalyzedby urease. (b) If the rate of the catalyzed reaction werethe same at 100 °C as it is at 21 °C, what would be the differencein the activation energy between the catalyzed anduncatalyzed reactions? (c) In actuality, what would you expectfor the rate of the catalyzed reaction at 100 °C as comparedto that at 21 °C? (d) On the basis of parts (c) and (d),what can you conclude about the difference in activationenergies for the catalyzed and uncatalyzed reactions?
The enzyme urease catalyzes the reaction of urea,
(NH2CONH2), with water to produce carbon dioxide and
ammonia. In water, without the enzyme, the reaction proceeds
with a first-order rate constant of 4.15 x 10-5 s-1 at
100 °C. In the presence of the enzyme in water, the reaction
proceeds with a rate constant of 3.4 x 104 s-1 at 21 °C.
(a) Write out the balanced equation for the reaction catalyzed
by urease. (b) If the rate of the catalyzed reaction were
the same at 100 °C as it is at 21 °C, what would be the difference
in the activation energy between the catalyzed and
uncatalyzed reactions? (c) In actuality, what would you expect
for the rate of the catalyzed reaction at 100 °C as compared
to that at 21 °C? (d) On the basis of parts (c) and (d),
what can you conclude about the difference in activation
energies for the catalyzed and uncatalyzed reactions?
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