Entropy (AQA A-Level Chemistry): Flashcards

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Entropy
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What does entropy (SS) measure?

Disorder or randomness in a system

Symbol for entropy

SS

Units of standard entropy (S∘S^\circ)

JK−1mol−1J K^{-1} mol^{-1}

Physical state with highest entropy

Gases

Physical state with lowest entropy

Solids

Effect of dissolving a solid on entropy

Increases entropy

Effect of more moles of gas on entropy

Increases entropy

Standard entropy at 0 K for perfect crystal

Zero

Formula for ΔS\Delta S of a reaction

ΔS=∑S∘(products)−∑S∘(reactants)\Delta S = \sum S^\circ(products) - \sum S^\circ(reactants)

What ΔS\Delta S indicates about a reaction

Whether disorder increases or decreases

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Explore AQA A-Level Chemistry Exam Questions by Topics

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Rate Equations (A Level only)

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