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{{expert-subject|Physics|date=September 2009}}

The theory of '''response reactions''' (RERs) or response equilibria was elaborated for the [[thermodynamic]] systems in which more than one equilibrium is established simultaneously.<ref>1. Fishtik, I.; Nagypál, I.; Gutman, I. J. Chem. Soc. Farady Trans. 1995, 91, 259-267. [http://www.rsc.org/Publishing/Journals/FT/article.asp?doi=FT9959100259]
</ref> It is based on detailed analysis of the [[Hessian determinant]]. The theory derives the sensitivity coefficient as the sum of the contributions of individual RERs. Thus all phenomena which are in apparent contradiction to the [[Le Chatelier principle]] could be interpreted. With the help of RERs the equilibrium coupling was defined.<ref>[http://pubs.acs.org/doi/abs/10.1021/jp060951k Hoffmann E. A.; Nagypál I. Phys. Chem. B. 2006, 110, 10581-10584]
</ref> RERs could be derived based either on the species.<ref>[http://www.rsc.org/publishing/journals/CP/article.asp?doi=b101725j Hoffmann E. A.; Nagypál, I. Phys. Chem. Chem. Phys. 2001, 3, 3107-3113]</ref> or on the stoichiometrically independent reactions of a parallel system. The set of RERs is unambiguous in a given system; and the number of them (M) is <math>S \choose C+1</math>, where S denotes the number of species and C refers to the number of components. In the case of [[three-component system]]s, RERs can be visualized on a triangle diagram.<ref>Nagypál I.; Hoffmann E.; Gutman I.; Fishtik I. Pure & Appl. Chem. 1998, 70, 583-590.[http://www.iupac.org/publications/pac/1998/pdf/7003x0583.pdf]</ref>

==References==

{{reflist}}

{{DEFAULTSORT:Response Reactions}}
[[Category:Thermodynamics]]

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