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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > August  >
In the Classroom
Equilibria That Shift Left upon Addition of More Reactant
Jeffrey E. Lacy
Department of Chemistry, Shippensburg University, Shippensburg, PA 17257
Cover
August 2005
Vol. 82 No. 8
p. 1192
Abstract
Most textbook presentations of Le Châtelier's principle in general and physical chemistry do not include a discussion of constant pressure conditions for which addition of a reactant can shift the equilibrium to the left. We propose presentations of isothermal, open systems at constant pressure for both levels of study by using concepts and skills that the respective students already possess. In addition, we derive novel criteria based on the stoichiometry of the reaction that can be used to identify those equilibria that will shift left upon addition of more reactant.
Supplement
The derivation of eq 7 is available.
*  Contents JCE2005p1192W.doc (Microsoft Word)
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JCE2005p1192W.zip
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*  Citation
 Lacy, Jeffrey E. J. Chem. Educ. 2005 82 1192.
*  Keywords
 Curriculum; Equilibrium; First-Year Undergraduate / General; Mathematics / Symbolic Mathematics; Misconceptions / Discrepant Events; Physical Chemistry; Second-Year Undergraduate; Textbooks / Reference Books; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 July 5, 2005
July 8, 2005
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