13.4. A Deeper Look: Carnot Cycles, Efficiency, and Entropy
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Entropy These processes are shown in reverse. The situations shown are so highly improbable that we would not expect to observe them in nature.
Thermodynamics
Endothermic Reaction Solid barium hydroxide octahydrate (Ba(OH)2*8H2O) and ammonium thiocyanate (NH4SCN) are mixed in a beaker, which is then placed on a few drops of water on a small board. The reaction that occurs is highly endothermic.
Thermodynamics : CompareEntropyQual (16 Variations) Indicate which substance in each of the following pairs of substances you expect to have higher entropy. Assume that you have a mole of each substance and all substances are at the same temperature.
Thermodynamics
Thermodynamics : ProbabilityEnergyDist (23 Variations)
Consider a system that has two indistinguishable molecules that can occupy three different energy levels (having energies of 1kJ, 2kJ and 3kJ, respectively). What is the probability that the molecules will have a total energy of 2 kJ?
John Krenos Metiu has created a significant set of volumes on undergraduate physical chemistry. The integration of Mathematica and Mathcad workbooks into the four texts provides instructors with an attractive new option in teaching. Krenos, John. J. Chem. Educ.2008, 85, 206.
Quantum Chemistry |
Statistical Mechanics |
Thermodynamics |
Kinetics
Configurational Entropy RevisitedFrank L. Lambert Positional entropy should be eliminated from general chemistry instruction and replaced by emphasis on the motional energy of molecules as enabling entropy change. Lambert, Frank L. J. Chem. Educ.2007, 84, 1548.
Statistical Mechanics |
Thermodynamics
Mass-Elastic Band Thermodynamics: A Visual Teaching Aid at the Introductory LevelWilliam C. Galley Demonstrations of five spontaneous isothermal processes involving the coupling of a mass and elastic band and arising from combinations of enthalpy and entropy changes are presented and then dissected. Analogies are drawn between these processes and common spontaneous molecular events such as chemical reactions and phase transitions. Galley, William C. J. Chem. Educ.2007, 84, 1147.
Measuring the EntropyEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Thermodynamics
Getting Acquainted with EntropyEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Thermodynamics
Maximum Useful WorkEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
