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Precipitation Reactions Two versions of the Orange Tornado, two reactions under a microscope, and updated stills of other precipitation reactions provide dramatic visual displays of solid formation.
Equilibrium : KspSaturation (12 Variations)
Zn(OH)2 has a Ksp of 4.5 x 10-17. If you have a solution of Zn(OH)2 that has a hydroxide ion concentration equal to 4.6 x 10-6 mol/L, the solution is ... (Assume that the only relevant reaction is the solubility-product equilibrium.)
Playing-Card EquilibriumRobert M. Hanson A simple hands-on simulation suitable for either classroom use or laboratory investigation involves using a standard deck of playing cards to explore the statistical aspects of equilibrium. Concepts that can be easily demonstrated include fluctuation around a most probable distribution, Le Chtelier's principle, the equilibrium constant, prediction of the equilibrium constant based on probability, and the effect of sample size on equilibrium fluctuations. Hanson, Robert M. J. Chem. Educ.2003, 80, 1271.
Equilibrium |
Statistical Mechanics |
Thermodynamics
LeChâtelier's Principle in the SciencesVolker B. E. Thomsen The concept of homeostasis in biology and the economic law of supply and demand are both equilibrium-like principles, but involve systems in the steady state. However, all these principles involve the stability of the system under consideration and the analogies presented may be useful in the teaching of LeChtelier's principle. Thomsen, Volker B. E. J. Chem. Educ.2000, 77, 173.
Equilibrium |
Learning Theories
The Complexity of Teaching and Learning Chemical EquilibriumLouise Tyson, David F. Treagust, and Robert B. Bucat This paper discusses three key issues relevant to secondary school chemistry teaching. They arise from a study of students' understanding of chemical equilibrium using qualitative and quantitative research methods. Tyson, Louise; Treagust, David F.; Bucat, Robert B. J. Chem. Educ.1999, 76, 554.
Nitrogen Oxides (GCMP)David M. Whisnant Nitrogen Oxides: this is a resource in the collection "General Chemistry Multimedia Problems". Two of the most important nitrogen oxides, N2O4 and NO2, are in equilibrium with each other. We are interested in how this equilibrium shifts with temperature. 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.
Equilibrium
How Accurate Is the Steady State ApproximationLars Ole Haustedt, Jonathan M. Goodman The steady-state approximation is commonly used in enzyme catalysis kinetics calculations, but how much error does the approximation introduce? This Java applet allows you to visually determine the accuracy of the steady-state and pre-equilibrium approximations.
Equilibrium
ChemPaths 104 W Mar 2John W. Moore Today in Chem 104:
* Lecture: Chemical Equilibrium
* Reading:
Kotz: Ch. 16, Sec. 1-2
Moore: Ch. 14, Sec. 1-2
* Homework #6 due by 11:55 pm F Mar 4
* Quiz #4 given in second discussion section this week
* Biomolecules Tutorial: Enzymes and Moodle Quiz due Today at 11:55 pm
