Entropy & Enthalpy Explorer

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Explore entropy and enthalpy basics.

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Mary Rose De Leon

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Entropy & Enthalpy ExplorerVersión en línea Explore entropy and enthalpy basics. por Mary Rose De Leon 1 Slide 1: What are Entropy and Enthalpy? Entropy (S) measures disorder or the number of microscopic configurations. Enthalpy (H) represents heat content at constant pressure. 2 Slide 2: Enthalpy Defined Enthalpy is defined as H = U + pV, where U is internal energy and pV is pressure-volume work. 3 Slide 3: Entropy Defined Entropy quantifies microscopic possibilities. In reversible processes, ΔS = q_rev/T; higher S means more disorder. 4 Slide 4: Units and Symbols Common units: Joules for enthalpy (ΔH) and J/K for entropy (ΔS). Symbols: H, S, U, T. 5 Slide 5: Temperature Dependence Entropy production grows with temperature. Temperature influences phase changes and the balance of enthalpy and entropy. 6 Slide 6: Gibbs Free Energy Gibbs free energy: ΔG = ΔH − TΔS. Reactions are spontaneous when ΔG < 0. 7 Slide 7: Endothermic vs Exothermic Endothermic: ΔH > 0, absorbs heat. Exothermic: ΔH < 0, releases heat. Entropy change also shapes spontaneity. 8 Slide 8: Phase Transitions and S Melting and vaporization increase entropy dramatically as order decreases with more microstates. 9 Slide 9: How to Measure Calorimetry estimates ΔH. Temperature dependence and third-law principles help evaluate ΔS. 10 Slide 10: Takeaways Key idea: Enthalpy tracks heat content, entropy tracks disorder. Their balance via ΔG governs spontaneity.

Entropy & Enthalpy ExplorerVersión en línea

Explore entropy and enthalpy basics.

por Mary Rose De Leon

Slide 1: What are Entropy and Enthalpy?

Entropy (S) measures disorder or the number of microscopic configurations. Enthalpy (H) represents heat content at constant pressure.

Slide 2: Enthalpy Defined

Enthalpy is defined as H = U + pV, where U is internal energy and pV is pressure-volume work.

Slide 3: Entropy Defined

Entropy quantifies microscopic possibilities. In reversible processes, ΔS = q_rev/T; higher S means more disorder.

Slide 4: Units and Symbols

Common units: Joules for enthalpy (ΔH) and J/K for entropy (ΔS). Symbols: H, S, U, T.

Slide 5: Temperature Dependence

Entropy production grows with temperature. Temperature influences phase changes and the balance of enthalpy and entropy.

Slide 6: Gibbs Free Energy

Gibbs free energy: ΔG = ΔH − TΔS. Reactions are spontaneous when ΔG < 0.

Slide 7: Endothermic vs Exothermic

Endothermic: ΔH > 0, absorbs heat. Exothermic: ΔH < 0, releases heat. Entropy change also shapes spontaneity.

Slide 8: Phase Transitions and S

Melting and vaporization increase entropy dramatically as order decreases with more microstates.

Slide 9: How to Measure

Calorimetry estimates ΔH. Temperature dependence and third-law principles help evaluate ΔS.

Slide 10: Takeaways

Key idea: Enthalpy tracks heat content, entropy tracks disorder. Their balance via ΔG governs spontaneity.

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