Justifying what is favored based off temperature changes and Delta H

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Nathan Tran 4K
Posts: 92
Joined: Fri Sep 28, 2018 12:16 am

Justifying what is favored based off temperature changes and Delta H

Postby Nathan Tran 4K » Tue Jan 22, 2019 12:17 pm

How do you justify that an increase in temperature for endothermic reactions favors product and vice versa for exothermic reactions? Can we reason this out without just memorizing?

Camille Marangi 2E
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Justifying what is favored based off temperature changes and Delta H

Postby Camille Marangi 2E » Tue Jan 22, 2019 12:22 pm

Not that heat is necessarily an experimental reactant/ product in any way but the best way I can explain it is as follows:

Endothermic- reactants + heat -> products
Exothermic- reactants -> products + heat

So if we are increasing the temperature, in the endothermic reaction we shift towards products and in the exothermic we shift towards reactants.

Cody Do 2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Justifying what is favored based off temperature changes and Delta H

Postby Cody Do 2F » Tue Jan 22, 2019 1:23 pm

If anything, try to think of it in terms of Le Chatelier's Principle of trying to reduce any stress added to the system. For endothermic reactions, heat is absorbed. Thus, if the temperature is increased, the system has more heat, and this extra heat is offset by being absorbed through more endothermic reactions. For exothermic reactions, heat is released. If the temperature is increased, the system has more heat. If there's a lot of heat present already, exothermic reactions are less likely to occur because if they did occur, more heat would be added to an already heated system.


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