For a simple second order reaction (one reactant only):
rate = - D[A]/Dt = k[A]2
Upon integration over time, we obtain:
1/[A]t - 1/[A]0 = kt
For a zero order reaction:
rate = - D[A]/Dt = k[A]0
Upon integration over time, we obtain:
[A]t - [A]0 = -kt
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