Describing reactions

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Niveda_Tennety_1H
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Describing reactions

Postby Niveda_Tennety_1H » Wed Mar 08, 2017 8:04 pm

When do you use endergonic and exergonic as opposed to exothermic and endothermic?

Claudette_Contr_3I
Posts: 23
Joined: Wed Sep 21, 2016 2:57 pm

Re: Describing reactions

Postby Claudette_Contr_3I » Wed Mar 08, 2017 8:11 pm

I believe it has to do with talking about Gibbs Free energy for reaction profiles.

becky a 3D
Posts: 7
Joined: Sat Jul 09, 2016 3:00 am

Re: Describing reactions

Postby becky a 3D » Wed Mar 08, 2017 8:16 pm

Exothermic and endothermic refer to thermodynamic properties, that is delta H. Exergonic and endergonic refer to the Gibbs free energy. We say that a negative delta H indicates an exothermic reaction, but that does not mean it is exergonic (you would have to refer to the sign of delta G) and vice versa (+deltaH= endothermic but not necessarily endergonic). Exergonic and endergonic have nothing to do with how hot or cold something gets, rather it describes the rxn in a more chemical meaning (spontaneity of the rxn) . Similarly and inversley, exo and endothermic have nothing to do with the likeliness of a rxn.


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