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The correct difference between first and second order reactions is that

A

A first-order reaction can catalyzed; a second-order reaction cannot be catalyzed

B

The half-life of a first-order reaction does not depend on [A]0[A]_0; the half-life of a second-order reaction does depend on [A]0[A]_0

Step-by-Step Solution

For a first-order reaction, t1/2=0.693kt_{1/2} = \frac{0.693}{k}, which is independent of initial concentration [A]0[A]_0. For a second-order reaction, t1/2=1k[A]0t_{1/2} = \frac{1}{k[A]_0}, which depends on the initial concentration.

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