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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.
Teaching Reaction Mechanisms Using the Curved Arrow Neglect (CAN) MethodJohn H. Penn and Abdulrahman G. Al-Shammari A new method for teaching organic reaction mechanisms that concentrates on intermediate reaction structures and can be used in a computer-assisted instruction environment is found to significantly enhance student performance in drawing traditional reaction mechanisms. Penn, John H.; Al-Shammari, Abdulrahman G. J. Chem. Educ.2008, 85, 1291.
Enrichment / Review Materials |
Mechanisms of Reactions |
Reactive Intermediates |
Student-Centered Learning
Acid-Catalyzed Enolization of β-TetraloneBrahmadeo Dewprashad, Anthony Nesturi, and Joel Urena This experiment allows students to use 1H NMR to compare the rates of substitution of benzylic and non-benzylic a hydrogens of -tetralone and correlate their findings with predictions made by resonance theory. Dewprashad, Brahmadeo; Nesturi, Anthony; Urena, Joel. J. Chem. Educ.2008, 85, 829.
Aldehydes / Ketones |
Isotopes |
Mechanisms of Reactions |
NMR Spectroscopy |
Reactive Intermediates |
Resonance Theory |
Synthesis
Six Pillars of Organic ChemistryJoseph J. Mullins This article focuses on a core set of conceptselectronegativity, polar covalent bonding, inductive and steric effects, resonance, and aromaticitythe proper application of which can explain and predict a wide variety of chemical, physical, and biological properties of molecules and conceptually unite important features of general, organic, and biochemistry. Mullins, Joseph J. J. Chem. Educ.2008, 85, 83.
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.
