Entropy (OCR A-Level Chemistry A): Flashcards

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Entropy
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Entropy (SS) measures

Dispersed energy and disorder

Symbol for entropy

SS

Units of entropy

J K−1mol−1\text{J K}^{-1}\text{mol}^{-1}

Entropy trend: solids, liquids, gases

Solids lowest, liquids middle, gases highest

Entropy at 0 K0\text{ K} (absolute zero)

Zero

Sign of all standard entropies (S°S°)

Always positive

Positive ΔS\Delta S means

Increased disorder/randomness

Standard temperature for S°S°

298 K298\text{ K}

Formula for ΔS°\Delta S°

ΣS°(prod)−ΣS°(react)\Sigma S°(\text{prod}) - \Sigma S°(\text{react})

More gas moles produced: ΔS\Delta S sign

Positive

Explore OCR A-Level Chemistry A Revision Notes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Model Answers by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Quizzes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Exam Questions by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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