AP®︎ Chemistry: Topic 5.9 Flashcards

Master key terms and definitions for Topic 5.9 of AP Chemistry – Pre-Equilibrium Approximation to help you prep for quizzes and the AP exam.

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Term

Intermediate

Definition

A species produced in one step and consumed in a later step, so it cancels overall.

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Intermediate
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A species produced in one step and consumed in a later step, so it cancels overall.

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Catalyst Vs. Intermediate In A Mechanism
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A catalyst is consumed then regenerated; an intermediate is formed then later consumed.

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Pre-Equilibrium Approximation
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A method used when a fast reversible first step precedes a slow step.

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Deriving A Rate Law Using Pre-Equilibrium
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Use the fast-step equilibrium expression to replace intermediates in the slow-step rate law.

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