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Ruiting Jia 4D
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Joined: Thu Sep 27, 2018 11:27 pm


Postby Ruiting Jia 4D » Sat Jan 19, 2019 1:38 pm

Besides the reaction equation, are there any other ways we can identify whether a reaction is endothermic or exothermic? And are there exceptions to being able to identify this from the equation?

Elaine Pham 2E
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Joined: Thu Sep 27, 2018 11:28 pm
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Re: exothermic/endothermic

Postby Elaine Pham 2E » Sat Jan 19, 2019 1:53 pm

If you are given delta H of the equation, you can identify if the reaction is endothermic or exothermic. If delta H (which represents the change in enthalpy) is positive, then it is an endothermic reaction. If delta H is negative, then it is an exothermic reaction since energy is being released, not absorbed.

Christine Chen 1H
Posts: 42
Joined: Thu Sep 27, 2018 11:18 pm

Re: exothermic/endothermic

Postby Christine Chen 1H » Sat Jan 19, 2019 3:31 pm

Often times, delta H will be given to determine whether a rxn is endothermic or exothermic. Positive delta H = endothermic; Negative delta H = exothermic.

Katelyn Phan 2A
Posts: 55
Joined: Thu Sep 27, 2018 11:23 pm

Re: exothermic/endothermic

Postby Katelyn Phan 2A » Sat Jan 19, 2019 5:51 pm

You can determine it based on the sign of delta h (enthalpy). You can also tell from the description of the reaction; whether or not energy is required or released.

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