Two Basic Drives (HSC SSCE Chemistry): Flashcards

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Two Basic Drives
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Energy drive

Nature's tendency to move from high to low energy states

Entropy (SS)

Measure of randomness, chaos, or disorder in a substance

Entropy drive

Nature's tendency towards increased chaos/randomness

Entropy order for states of matter

Solid < Liquid < Gas

If entropy drive is positive, ΔS\Delta S is...

Positive (same direction)

If energy drive is forward, ΔH\Delta H is...

Negative (opposite relationship)

Both drives forward means reaction...

Always occurs spontaneously

Both drives backward means reaction...

Never occurs spontaneously

Gas production effect on entropy

Greatly increases entropy (ΔS\Delta S positive)

Dissolution of solid in solvent effect on entropy

Increases entropy

Explore HSC SSCE Chemistry Revision Notes by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

Explore HSC SSCE Chemistry Model Answers by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

Explore HSC SSCE Chemistry Quizzes by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

Explore HSC SSCE Chemistry Exam Questions by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

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