Entropy and Gibbs Free Energy

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What is entropy?

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Entropy is a measure of the disorder or randomness in a system. It quantifies the number of microscopic configurations that correspond to a thermodynamic system's macroscopic state.

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What does it mean for a process to be thermodynamically favorable?

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A thermodynamically favorable process is one that occurs spontaneously under given conditions, typically characterized by a decrease in Gibbs free energy (ΔG < 0).

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What is Gibbs Free Energy?

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Gibbs Free Energy (G) is a thermodynamic potential that measures the maximum reversible work obtainable from a thermodynamic system at constant temperature and pressure.

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What is the relationship between entropy and Gibbs Free Energy?

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The relationship is given by the equation ΔG = ΔH - TΔS, where ΔG is the change in Gibbs Free Energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

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What does a negative change in entropy (ΔS < 0) indicate about a process?

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A negative change in entropy indicates that the process leads to a decrease in disorder or randomness in the system.

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What is the significance of ΔH in thermodynamic processes?

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ΔH represents the change in enthalpy, which indicates the heat absorbed or released during a process at constant pressure.

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What conditions make a process thermodynamically favorable at all temperatures?

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A process is thermodynamically favorable at all temperatures if ΔS > 0 (increase in entropy) and ΔH < 0 (exothermic reaction).

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What happens to the entropy of a system when ice melts?

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When ice melts, the entropy of the system increases because the solid structure of ice becomes the more disordered liquid water.

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What is deposition in thermodynamics?

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Deposition is the phase transition in which a gas transforms directly into a solid without passing through the liquid phase.

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What does it mean if ΔH < 0 and ΔS < 0 for a process?

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If ΔH < 0 and ΔS < 0, the process is exothermic and leads to a decrease in entropy, making it thermodynamically favorable only at low temperatures.