positive or negative values


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Crystal Escobar 1F
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

positive or negative values

Postby Crystal Escobar 1F » Fri Jan 22, 2016 9:55 pm

How do we determine whether a the values of w, q, or U are negative or positive?

Spencer Johnson 1C
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

Re: positive or negative values

Postby Spencer Johnson 1C » Sat Jan 23, 2016 2:35 pm

It usually depends on the wording of the question. For example, if heat is absorbed by the system q is positive and the reaction is endothermic but if heat is released then q is negative and the reaction is exothermic.


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