delta H

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JChen_2I
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

delta H

Postby JChen_2I » Tue Jan 14, 2020 11:56 pm

Do we have to know how to calculate delta H? If yes, how?

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

Re: delta H

Postby Andrew Pfeiffer 2E » Wed Jan 15, 2020 12:05 am

We don't have to be able to calculate delta H yet, but eventually, when we go over enthalpy in more depth, we will learn how to calculate it.

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: delta H

Postby Justin Sarquiz 2F » Wed Jan 15, 2020 8:17 am

All you need to know about enthalpy so far is that negative enthalpy means exothermic and a positive enthalpy means endothermic. Therefore, heating up an endothermic reaction causes equilibrium to favor products, and cooling an exothermic reaction causes equilibrium to favor products too.

Jasmine Vallarta 2L
Posts: 102
Joined: Sat Aug 17, 2019 12:18 am

Re: delta H

Postby Jasmine Vallarta 2L » Wed Jan 15, 2020 9:21 am

For now, we just need to know the value of delta H to classify a reaction as endo/exothermic

Renee Grange 1I
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am
Been upvoted: 1 time

Re: delta H

Postby Renee Grange 1I » Wed Jan 15, 2020 10:21 am

For right now, we only need to use delta H to determine is a reaction is endothermic or exothermic. If delta H is positive, the reaction is endothermic. If delta H is negative, the reaction is exothermic.

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: delta H

Postby preyasikumar_2L » Wed Jan 15, 2020 11:28 am

I think last class Dr. Lavelle mentioned that there are three(?) ways of calculating delta H and that he'd teach us how to do it (if not now then eventually). However, for now it is important to know that positive delta H means that the reaction is endothermic and that heating the system will shift the reaction forward (towards the products), and that negative delta H means that the reaction is exothermic and that heating the system will shift the reaction backward (towards the reactants).


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