AP Chemistryhardmcq1 pt

A reaction mechanism is proposed to occur in two steps. If the first step is slow and the second step is fast, then:

A.The rate law is determined by the second step

B.The rate law cannot be determined

C.Both steps contribute equally to the rate law

D.The rate law is determined by the first (slow) step

Explanation

Core Concept

In a multi-step mechanism, the slowest step (rate-determining step) determines the overall rate law. The fast step is limited by how quickly the slow step produces its reactants.

Correct Answer

DThe rate law is determined by the first (slow) step

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