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Exothermic vs Endothermic

Posted: Fri Mar 15, 2019 11:51 pm
by Jaira_Murphy_2D
How can you tell if a reaction is endothermic or exothermic based off Arrhenius equation, or given Ea and k?

Re: Exothermic vs Endothermic

Posted: Fri Mar 15, 2019 11:55 pm
by PranitKumaran1F
If the Ea of the forward rxn is greater than the Ea of the reverse rxn, then it is endothermic and vise versa

Re: Exothermic vs Endothermic

Posted: Fri Mar 15, 2019 11:57 pm
by hanna_maillard3B
so to clarify, if a higher activation energy is needed for the forward reaction compared to the reverse reaction, then the reaction is endothermic ?

Re: Exothermic vs Endothermic

Posted: Fri Mar 15, 2019 11:58 pm
by Jaira_Murphy_2D
I love chemistry community because everyone replies so fast!

Re: Exothermic vs Endothermic

Posted: Sat Mar 16, 2019 12:23 am
by Lydia Luong 4L
Yes, you are correct @hanna_maillard3B

Re: Exothermic vs Endothermic

Posted: Sat Mar 16, 2019 1:43 pm
by Milena Aragon 2B
A higher activation energy means that the reaction requires a higher temperature to move in the forward direction and since this is the case you can conclude that the reaction is endothermic (since it is using the heat from the temp. to move the reaction forward). From this you know that the reverse is true for exothermic reactions

Re: Exothermic vs Endothermic

Posted: Sat Mar 16, 2019 6:38 pm
by Jack Hewitt 2H
Ea forward > Ea Reverse: Endothermic
Ea forward < Ea Reverse: Exothermic