For a reaction A + B $\to$ C,if the concentration of B is much larger than A so that [B] remains constant during the reaction while [A] is varied,the kinetics will be
A)sigmoidal.
B)pseudo-first-order.
C)unimolecular.
D)zero-order.
E)hyperbolic.

Question

Quizplus · Accepted Answer

Since the concentration of B remains constant, the reaction will exhibit pseudo-first-order kinetics with respect to A. This means that the observed rate of the reaction will be proportional to the concentration of A raised to the first power (i.e., first-order kinetics). The overall rate expression will be rate = k[A][B] (where [B] is constant), which simplifies to rate = k'[A], with k' = k[B]. This is a common situation in enzyme-catalyzed reactions, where one substrate is present at much higher concentrations than the other(s).

For a Reaction a + B →\to→ C,if the Concentration of B Is Much Larger Than a of B

For a Reaction a + B $\to$ C,if the Concentration of B Is Much Larger Than a of B