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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > July  >
Research: Science and Education
What Is a Reaction Rate?
Guy Schmitz
Faculté de Sciences Appliquées, Université Libre de Bruxelles, 1050 Brussels, Belgium
Cover
July 2005
Vol. 82 No. 7
p. 1091
Abstract
Experimentally, the rates of reactant consumption or rates of product formation are measured. These rates are related to, but different from, reaction rates. A reaction rate is a property of a given reaction, not of chemical species. The relationships between these two kinds of rates are not always simple. In a homogeneous closed reactor, a correct definition of a reaction rate is (dξ/dt)/V, where V is the reactor volume and ξ the extent of reaction. Open systems require a different approach to the concept of reaction rate and there is no simple equation that can be used as a general definition in all kinds of reactors. We propose a definition leading always and simply to the correct equations.
More Information
*  Citation
 Schmitz, Guy. J. Chem. Educ. 2005 82 1091.
*  Keywords
 Enrichment / Review Materials; Kinetics; Misconceptions / Discrepant Events; Physical Chemistry; Rate Law; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 May 31, 2005
June 7, 2005
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