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Entropy & Enthalpy Explorer

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Entropy & Enthalpy Explorer

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Explore entropy and enthalpy basics.

Created by

Mary Rose De Leon
Mary Rose De Leon
Philippines

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Entropy & Enthalpy Explorer
 

Entropy & Enthalpy ExplorerOnline version

Explore entropy and enthalpy basics.

by 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.

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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.

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Slide 6: Gibbs Free Energy

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

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Slide 7: Endothermic vs Exothermic

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

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Slide 8: Phase Transitions and S

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

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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.
 
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