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°, 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
Materials Provided: Agar, copper metal, copper sulfate solution, potassium nitrate, hydrochloric acid solution, sodium bicarbonate, sodium carbonate, calorimeters, parafilm, alligator clip leads, 150-mm u-tube.
*AP is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, these products.
Flinn Catalog/Reference Manual Page 331
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