Exothermic and Endothermic Reactions

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Jasmine 2C
Posts: 184
Joined: Wed Sep 18, 2019 12:18 am

Exothermic and Endothermic Reactions

Postby Jasmine 2C » Sun Jan 19, 2020 3:12 pm

Are all reactions exothermic or endothermic, whether slightly or strongly exo/endothermic? And on this topic, are all reactions with a positive delta H going to be endothermic and all reactions with a negative delta H going to be exothermic, despite forming or breaking bonds during the reaction?

Andrew Pfeiffer 2E
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

Re: Exothermic and Endothermic Reactions

Postby Andrew Pfeiffer 2E » Sun Jan 19, 2020 3:23 pm

Yes and yes! You got it.

AveryAgosto
Posts: 76
Joined: Wed Sep 18, 2019 12:16 am

Re: Exothermic and Endothermic Reactions

Postby AveryAgosto » Sun Jan 19, 2020 3:25 pm

Every reaction is either exothermic or endothermic. You are correct about the relationship to delta H

Anokhi Patel 2B
Posts: 76
Joined: Fri Aug 09, 2019 12:17 am

Re: Exothermic and Endothermic Reactions

Postby Anokhi Patel 2B » Sun Jan 19, 2020 3:31 pm

Negative delta H means the loss of energy, negative delta H reaction is endothermic since heat is required to instigate the reaction. Likewise, it goes for positive delta H and exothermic reactions.

ASetlur_1G
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Exothermic and Endothermic Reactions

Postby ASetlur_1G » Sun Jan 19, 2020 11:01 pm

Will we always be give delta H to tell if a reaction is endothermic or exothermic? If not, how do we tell?

Sydney Myers 4I
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

Re: Exothermic and Endothermic Reactions

Postby Sydney Myers 4I » Sun Jan 19, 2020 11:10 pm

It's true that breaking bonds releases energy, but only apply this when the breaking of a single bond in a very simple reaction. Otherwise there are too many factors to simplify to just breaking or forming bonds.


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