AP®︎ Chemistry: Topic 9.2 Flashcards

Master key terms and definitions for Topic 9.2 of AP Chemistry – Absolute Entropy and Entropy Change to help you prep for quizzes and the AP exam.

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Term

Absolute Entropy / Standard Molar Entropy (S°)

Definition

The entropy of 1 mole of a substance at standard conditions, measured absolutely.

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Absolute Entropy / Standard Molar Entropy (S°)
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The entropy of 1 mole of a substance at standard conditions, measured absolutely.

9.2.A
State Function
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A property whose change depends only on initial and final states, not pathway.

9.2.A
Sign of ΔS°
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Positive means greater disorder; negative means greater order or fewer accessible microstates.

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Predicting Entropy Change from Physical or Chemical Change
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Entropy usually increases with more gas particles, phase changes toward gas, or more dispersed matter.

9.2.A
Standard Entropy Change of Reaction (ΔS°rxn)
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Calculate by summing coefficient-weighted product entropies and subtracting coefficient-weighted reactant entropies.

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