Non-Equilibrium Systems (HSC SSCE Chemistry): Quizzes

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Non-Equilibrium Systems
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In chemistry, what defines a system at equilibrium?

Rate of forward = rate of reverse reaction

What are non-equilibrium systems?

Reactions proceeding one way to completion

What does a positive entropy change (ΔS>0\Delta S > 0) indicate?

Increasing randomness (favorable)

What does a negative enthalpy change (ΔH<0\Delta H < 0) indicate?

Heat released (exothermic, favorable)

When does a reaction occur spontaneously?

ΔS>0\Delta S > 0 AND ΔH<0\Delta H < 0

What is the formula for Gibbs free energy?

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

What does a negative Gibbs free energy (ΔG<0\Delta G < 0) mean?

Reaction will occur spontaneously

Why do combustion reactions continue once started?

Negative ΔG\Delta G makes them spontaneous

Why is photosynthesis non-spontaneous?

Positive ΔG\Delta G value

What happens when ΔG≈0\Delta G \approx 0?

Both forward & reverse reactions can occur

Explore HSC SSCE Chemistry Revision Notes by Topics

Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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