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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > April  >
In the Classroom
A Consistent Set of Oxidation Number Rules for Intelligent Computer Tutoring
Dale A. Holder, and Benny G. Johnson
Quantum Simulations, Inc., Murrysville, PA 15668

Paul J. Karol
Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213
Cover
April 2002
Vol. 79 No. 4
p. 465
Abstract
We have developed a method for assigning oxidation numbers that eliminates the inconsistencies and ambiguities found in most conventional textbook rules, yet remains simple enough for beginning students to use. It involves imposition of a two-level hierarchy on a set of rules similar to those already being taught. We recommend emphasizing that the oxidation number method is an approximate model and cannot always be successfully applied. This proper perspective will lead students to apply the rules more carefully in all problems. Whenever failure does occur, it will indicate the limitations of the oxidation number concept itself, rather than merely the failure of a poorly constructed set of rules. We have used these improved rules as the basis for an intelligent tutoring program on oxidation numbers.
More Information
*  Citation
 Holder, Dale A.; Johnson, Benny G.; Karol, Paul J. J. Chem. Educ. 2002 79 465.
*  Keywords
 Computer Assisted Instruction; Introductory / High School Chemistry; Redox Reactions; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 March 1, 2002
March 16, 2005
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