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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.
Cp/Cv Ratios Measured by the Sound Velocity Method Using Calculator-Based Laboratory TechnologyMario Branca and Isabella Soletta The values ? = Cp /Cv (heat capacity at a constant pressure / heat capacity at constant volume) for air, oxygen, nitrogen, argon, and carbon dioxide were determined by measuring the velocity of sound through these gases at room temperature using Calculator-Based Laboratory Technology. Branca, Mario; Soletta, Isabella. J. Chem. Educ.2007, 84, 462.
Gases |
Thermodynamics |
Physical Properties
On the Importance of IdealityRubin Battino, Scott E. Wood, and Arthur G. Williamson Analysis of the utility of ideality in gaseous phenomena, solutions, and the thermodynamic concept of reversibility. Battino, Rubin; Wood, Scott E.; Williamson, Arthur G. J. Chem. Educ.2001, 78, 1364.
Thermodynamics |
Gases |
Solutions / Solvents
Experiencing and Visualizing the First Law of Thermodynamics: An In-Class WorkshopPamela Mills, William V. Sweeney, and Waldemar Cieniewicz A handheld device that illustrates the concepts of heat, work, energy transfer, and thermodynamic path. Mills, Pamela; Sweeney, William V.; Cieniewicz, Waldemar. J. Chem. Educ.2001, 78, 1360.
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.
Thermodynamics
Two Solids (GCMP)David M. Whisnant Two Solids: this is a resource in the collection "General Chemistry Multimedia Problems". When two solids barium hydroxide octahydrate, Ba(OH)2. 8H2O and ammonium thiocyanate, NH4SCN are mixed, they react. We will explore the thermodynamics of the reaction. 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.
