Abstract
This paper proposes a novel account of emergence in chemistry. The account, which I call “functional emergence”, is based on the idea that many chemical properties are defined not by shared microphysical constituents, but by their functional role in chemical reactions. Although weaker than other emergentist accounts, functional emergence still counts as ontological emergence, and it can justify the ontological autonomy of chemistry. However, what is emergent according to the account I’m proposing is not chemical objects, but rather chemical properties, laws, and explanations. Also, unlike other accounts of emergence, functional emergence is compatible with physicalism and the causal closure of physics.
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- 1.
Throughout this paper I am using the word “entity” to mean “concrete individual” or “object”.
- 2.
The metaphor of the layer cake is due to Putnam and Oppenheim (1958), who adopted it to argue for a certain kind of reductionism.
- 3.
A set of properties H supervenes on a set of properties L if and only if (i) any two objects x and y that have the same L properties will necessarily have the same H properties (though not necessarily viceversa), and (ii) any two objects z and w that differ in their H properties will also differ in their L properties (though not necessarily viceversa).
- 4.
- 5.
An ontology includes objects, phenomena, as well as relations between them. If one includes explanations, then they could be regarded as objective relations between laws and phenomena. The idea that explanations could be seen ontically does not sound as implausible if one thinks that it makes sense to say that for a certain phenomenon an explanation exists but it may never be found.
- 6.
For a comprehensive review see Manafu (2013a).
- 7.
- 8.
For a different view, see Gibb (2010).
- 9.
In this context, by “chemical laws” I do not mean exceptionless and timeless universal truths, of the kind that occur in fundamental physics (or maybe not even there). Rather, I mean the kind of regularities chemists use on a daily basis, and which chemistry students find circled in chemistry textbooks. For example, the statement that “Acids in reaction with metals generate hydrogen gas” would count as a chemical law. If one does not accept this charitable reading of what a law should mean, then the Nagelian reduction of chemistry to physics cannot even begin to be discussed.
- 10.
I am assuming a strong connection between kinds and properties.
- 11.
Of course, one may reply by saying that bridge laws need not be biconditionals. But there are many problems with this move, and this is not the place to discuss them. I will just mention Fodor who writes that if the relation in the bridge law “is interpreted as any relation other than identity, the truth of reductivism will only guaranty the truth of a weak version of physicalism” (1974, p. 99).
- 12.
For the distinction between a property and its instances see Swoyer and Orilia (2011).
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Manafu, A. (2015). A Novel Approach to Emergence in Chemistry. In: Scerri, E., McIntyre, L. (eds) Philosophy of Chemistry. Boston Studies in the Philosophy and History of Science, vol 306. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9364-3_4
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