AP®︎ Chemistry: Topic 6.9 Flashcards

Master key terms and definitions for Topic 6.9 of AP Chemistry – Hess’s Law to help you prep for quizzes and the AP exam.

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Term

Representing a Process as a Sequence of Steps

Definition

Break an overall reaction into known reactions, then manipulate and add them to match the target.

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Representing a Process as a Sequence of Steps
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Break an overall reaction into known reactions, then manipulate and add them to match the target.

6.9.A6.9.A.1
Rules of Hess's Law
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Reverse reaction: change ΔH sign; multiply coefficients: scale ΔH; add reactions: add ΔH values.

6.9.B6.9.B.2
Canceling Intermediate Species
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Species appearing on both sides of added steps cancel, leaving only the overall reaction.

6.9.A6.9.A.1
Hess's Law
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The overall enthalpy change equals the sum of step enthalpies because energy is conserved.

6.9.B6.9.B.1