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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > March  >
In the Classroom
A Chemically Relevant Model for Teaching the Second Law of Thermodynamics
Bryce E. Williamson
Department of Chemistry, University of Canterbury, Christchurch, New Zealand

Tetsuo Morikawa
Department of Chemistry, Joetsu University of Education, Joetsu 943-8512, Japan

Cover
March 2002
Vol. 79 No. 3
p. 339
Abstract
A thought experiment based on an 1895 experiment by Hans Jahn is suggested as a chemically relevant model for teaching the second law of thermodynamics at post-first-year university level. This model could supplement the heat-engine/Carnot-cycle model that currently prevails in explanations of the reversible limit. An ideal electrochemical cell in calorimeter A is connected, in circuit, to a resistor in calorimeter B. The heat of the electrochemical process is measured by A and the non-expansion work by B. Simple diagrams based on this model clearly illustrate the path dependence of heat and work and their relationships to the state functions DH, DG, and TDS in the reversible limit.
More Information
*  Citation
 Williamson, Bryce E.; Morikawa, Tetsuo. J. Chem. Educ. 2002 79 339.
*  Keywords
 Calorimetry; Electrochemistry; Physical Chemistry; Thermodynamics
*  History
 Created:
Last Updated:		 January 31, 2002
March 16, 2005
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