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Use this set of three thermodynamics demonstrations to both engage your students in a hands-on review and to test their understanding of this sometimes difficult yet fundamental topic.
- Entropy and Free Energy—Exothermic crystallization of sodium acetate trihydrate sparks a lively debate on spontaneity, free energy, enthalpy, and entropy.
- Hess’s Law—Two-part calorimetry demonstration provides data for reviewing the properties of state functions and performing H°, ΔS° and ΔG° calculations.
- Free Energy and Redox Reactions—Solve the Nernst equation for a copper concentration cell to demonstrate the relationship between free energy and electrode potential.
Concepts: Enthalpy, heat of formation, Hess’s law, calorimetry, entropy, free energy.
Time Required: One class period