Temperature and Reaction Spontaneity (HSC SSCE Chemistry): Flashcards

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Temperature and Reaction Spontaneity
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What governs temp. & spontaneity relationship?

Gibbs free energy

Type 1 reaction characteristic

Immediate when reactants combined at room temp

Type 2 reaction characteristic

Needs initial spark, exothermic, self-sustaining

Type 3 reaction characteristic

Requires continuous heating, endothermic

Define spontaneous reaction

Occurs without ongoing energy input

Which reaction types are spontaneous?

Types 1 and 2

Formula for ΔG∘\Delta G^\circ

ΔG∘=ΔH∘−TΔS∘\Delta G^\circ = \Delta H^\circ - T\Delta S^\circ

Meaning of ΔG∘<−10\Delta G^\circ < -10 kJ/mol at 298 K

Spontaneous, proceeds to completion

Effect of positive ΔS∘\Delta S^\circ on temperature

Reaction more spontaneous at higher temps

Effect of large ΔS∘\Delta S^\circ

Spontaneity highly temperature-dependent

Explore HSC SSCE Chemistry Revision Notes by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

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Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

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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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