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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.
EnergyJohn W. Moore Scientific Challenges in Sustainable Energy Technology, by Nathan S. Lewis of the California Institute of Technology, summarizes data on energy resources and analyses the implications for human society. Slides, text, and streaming audio/video are available at his Web site. There is much in this presentation that could (and should) be incorporated into chemistry pedagogy. Moore, John W. J. Chem. Educ.2008, 85, 891.
Thermodynamics
Job's Analysis of the Range of the "Dalton Syringe Rocket"Natalie Barto, Brandon Henrie, and Ed Vitz An apparatus for safely igniting fuel gas/oxygen mixtures in a syringe and measuring the distance that the syringe is propelled is presented. The distance (range) is analyzed by the method of continuous variation (Job's Method) to determine the stoichiometry of the reaction. Barto, Natalie; Henrie, Brandon; Vitz, Ed. J. Chem. Educ.2006, 83, 1505.
Gases |
Oxidation / Reduction |
Thermodynamics |
Stoichiometry
Conceptual Considerations in Molecular ScienceDonald T. Sawyer The undergraduate curriculum and associated textbooks include several significant misconceptions. Sawyer, Donald T. J. Chem. Educ.2005, 82, 985.
Fossil Fuels and the Energy CrisisEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Thermodynamics
Standard Enthalpies of FormationEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Thermodynamics
Disorder (GCMP)David M. Whisnant Disorder: this is a resource in the collection "General Chemistry Multimedia Problems". A spontaneous change is one that has a natural tendency to occur without needing to be driven by an external influence. This problem will explore the influence of entropy, a measure of disorder, on the spontaneity of a few processes. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
