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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 : CalcRxnQuotient (13 Variations) In an experiment, 4.44 mol of SO2, 7.93 mol of O2 and 4.03 mol of SO3 are placed in a 2.0L reaction vessel at a certain temperature. Calculate the reaction quotient, Q, for the reaction as written:
What is the calculated reaction quotient, Q? {2:NUMERICAL:=2.1e-1:1e-2#Correct! ~%50%2.1e-1:5e-2#Close but not quite right}
If Kc for this reaction at the temperature of the experiment is 3.7 x 103, will the reaction move toward the left or toward the right? {1:MULTICHOICE:left#Sorry, that's wrong.~=right#Correct!}
Does the Addition of Inert Gases at Constant Volume and Temperature Affect Chemical Equilibrium?João C. M. Paiva, Jorge Gonçalves, and Susana Fonseca This article examines three approaches, leading to different conclusions, for answering the question "Does the addition of inert gases at constant volume and temperature modify the state of equilibrium?" Paiva, João C. M.; Gonçalves, Jorge; Fonseca, Susana. J. Chem. Educ.2008, 85, 1133.
Equilibrium |
Gases |
Thermodynamics
Introducing Undergraduate Students to Electrochemistry: A Two-Week Discovery Chemistry ExperimentKenneth V. Mills, Richard S. Herrick, Louise W. Guilmette, Lisa P. Nestor, Heather Shafer, and Mauri A. Ditzler, Within the framework of a laboratory-focused, guided-inquiry pedagogy, students discover the Nernst equation, the spontaneity of galvanic cells, concentration cells, and the use of electrochemical data to calculate equilibrium constants. Mills, Kenneth V.; Herrick, Richard S.; Guilmette, Louise W.; Nestor, Lisa P.; Shafer, Heather;Ditzler, Mauri A. J. Chem. Educ.2008, 85, 1116.
Electrochemistry |
Electrolytic / Galvanic Cells / Potentials |
Equilibrium
Discovering the Thermodynamics of Simultaneous Equilibria. An Entropy Analysis Activity Involving Consecutive EquilibriaThomas H. Bindel This activity explores the thermodynamics of simultaneous, consecutive equilibria and is appropriate for second-year high school or AP chemistry. Students discover that a reactant-favored (entropy-diminishing) reaction can be caused to happen if it is coupled with a product-favored reaction of sufficient entropy production. Bindel, Thomas H. J. Chem. Educ.2007, 84, 449.
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
