Entropy and Gibbs Free Energy (HSC SSCE Chemistry): Quizzes

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Temperature and Reaction Spontaneity
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Which type needs a spark to start but then sustains itself?

Type 2 reactions

What defines a spontaneous reaction?

Occurs without ongoing energy input

Which reaction types are classified as spontaneous?

Types 1 and 2 only

What gas pressure defines standard conditions?

100.0 kPa

At 298 K, what does ΔG∘<−10\Delta G^\circ < -10 kJ mol−1^{-1} indicate?

Spontaneous to completion

What is the equation for Gibbs free energy?

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

What conversion must be done with ΔS∘\Delta S^\circ for calculations?

Multiply by 10−310^{-3} to get kJ K−1^{-1} mol−1^{-1}

How does positive ΔS∘\Delta S^\circ affect temperature dependence?

High T makes ΔG∘\Delta G^\circ more negative

What characterises Type 3 reactions?

Require continuous heating

What is the threshold value for ΔG∘\Delta G^\circ at 1000 K?

±40\pm 40 kJ mol−1^{-1}

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