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Entropy and Chemical Substance

Published online by Cambridge University Press:  01 January 2022

Robin Findlay Hendry
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Abstract

In this essay I critically examine the role of entropy of mixing in articulating a macroscopic criterion for the sameness and difference of chemical substances. Consider three cases of mixing in which entropy change occurs: isotopic variants, spin isomers, and populations of atoms in different orthogonal quantum states. Using these cases I argue that entropy of mixing tracks differences between physical states, differences that may or may not correspond to a difference of substance. It does not provide a criterion for the sameness and difference of substance that is appropriate to chemistry.

Type
Research Article
Information
Philosophy of Science , Volume 77 , Issue 5 , December 2010 , pp. 921 - 932
Copyright
Copyright © The Philosophy of Science Association

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Footnotes

‡

I am grateful to Paul Needham and the late Krishna Vemulapalli for illuminating conversations on the topic of this essay.

References

Aston, F. W., Baxter, Gregory P., Brauner, Bohuslav, Debierne, A., Leduc, A., Richards, T. W., Soddy, Frederick, and Urbain, G.. 1923. “Report of the International Committee on Chemical Elements.” Journal of the American Chemical Society 45:867–74.CrossRefGoogle Scholar
Denbigh, K. G. 1966. The Principles of Chemical Equilibrium. 2nd ed. Cambridge: Cambridge University Press.Google Scholar
Denbigh, K. G., and Denbigh, J. S.. 1985. Entropy in Relation to Incomplete Knowledge. Cambridge: Cambridge University Press.Google Scholar
Denbigh, K. G., and Redhead, M. L. G.. 1989. “Gibbs' Paradox and Non-uniform Convergence.” Synthese 81:283–313.CrossRefGoogle Scholar
Dieks, Dennis, and Dijk, Vincent van. 1988. “Another Look at the Quantum Mechanical Entropy of Mixing.” American Journal of Physics 56:430–34.CrossRefGoogle Scholar
Farkas, Adalbert. 1935. Orthohydrogen, Parahydrogen and Heavy Hydrogen. Cambridge: Cambridge University Press.Google Scholar
Hendry, Robin Findlay. 2006. “Elements, Compounds and Other Chemical Kinds.” Philosophy of Science 73:864–75.CrossRefGoogle Scholar
Hendry, Robin Findlay. 2008. “Microstructuralism: Problems and Prospect.” In Stuff: The Nature of Chemical Substances, ed. Ruthenberg, Klaus and Brakel, Jaap van, 107–20. Würzburg: Königshausen und von Neumann.Google Scholar
Hendry, Robin Findlay. Forthcoming. The Metaphysics of Chemistry. New York: Oxford University Press.Google Scholar
Kragh, Helge. 2000. “Conceptual Changes in Chemistry: The Notion of a Chemical Element, ca. 1900–1925.” Studies in History and Philosophy of Modern Physics B 31:435–50.Google Scholar
Moore, Walter J. 1963. Physical Chemistry. 4th ed. London: Longmans, Green & Co.Google Scholar
Needham, Paul. 2000. “What Is Water?” Analysis 60:13–21.CrossRefGoogle Scholar
Needham, Paul. 2002. “The Discovery That Water Is H2O.” International Studies in the Philosophy of Science 16:205–26.CrossRefGoogle Scholar
Needham, Paul. 2008. “Is Water a Mixture? Bridging the Distinction between Physical and Chemical Properties.” Studies in History and Philosophy of Science 39:66–77.CrossRefGoogle Scholar
Needham, Paul. 2010a. “Substance and Time.” British Journal for the Philosophy of Science 61:485–512.CrossRefGoogle Scholar
Needham, Paul. 2010b. “A Mereological Interpretation of the Phase Rule.” Philosophy of Science, in this issue.CrossRefGoogle Scholar
Needham, Paul. 2010c. “Microessentialism: What Is the Argument?” Noûs, forthcoming.CrossRefGoogle Scholar
Ostwald, Wilhelm. 1904. “Elements and Compounds.” Journal of the Chemical Society, Transactions 85:506–22.CrossRefGoogle Scholar
Van Brakel, Jaap. 2000. Philosophy of Chemistry. Leuven: Leuven University Press.Google Scholar
Van der Vet, Paul. 1979. “The Debate between F. A. Paneth, G. von Hevesy and K. Fajans on the Concept of Chemical Identity.” Janus 92:285–303.Google Scholar
Vemulapalli, G. K. 2010. “Thermodynamics and Chemistry: How Does a Theory Formulated without Reference to Matter Explain the Properties of Matter?” Philosophy of Science, in this issue.CrossRefGoogle Scholar
Von Neumann, John. 1955. Mathematical Foundations of Quantum Mechanics. Princeton, NJ: Princeton University Press.Google Scholar
Zemansky, Mark. 1957. Heat and Thermodynamics. New York: McGraw-Hill.Google Scholar