AP®︎ Chemistry: Topic 5.3 Flashcards

Master key terms and definitions for Topic 5.3 of AP Chemistry – Concentration Changes Over Time to help you prep for quizzes and the AP exam.

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Term

Zeroth-, First-, and Second-Order Integrated Rate Laws

Definition

Zeroth: [A]t - [A]0 = -kt; first: ln[A]t - ln[A]0 = -kt; second: 1/[A]t - 1/[A]0 = kt.

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Zeroth-, First-, and Second-Order Integrated Rate Laws
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Zeroth: [A]t - [A]0 = -kt; first: ln[A]t - ln[A]0 = -kt; second: 1/[A]t - 1/[A]0 = kt.

5.3.A5.3.A.4
Half-Life in First-Order Reactions
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The time for concentration to halve, constant for first-order reactions, with t1/2 = 0.693/k.

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Radioactive Decay as First-Order Kinetics
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Unstable nuclei decay at a rate proportional to the amount present, giving a constant half-life.

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Integrated Rate Law Plots
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[A] vs t, ln[A] vs t, and 1/[A] vs t identify order and slope gives k.

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