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exothermic vs endothermic

Posted: Wed Jan 24, 2018 7:51 pm
by Sophie Krylova 2J
For calorimeter problems, is the water, the calorimeter, or the air (outside of the calorimeter) the surroundings?

Re: exothermic vs endothermic

Posted: Wed Jan 24, 2018 7:53 pm
by Leah Thomas 2E
The water is considered the surroundings because that is where the system is happening inside.

Re: exothermic vs endothermic

Posted: Thu Jan 25, 2018 12:33 pm
by Cali Rauk1D
calorimeters are always isolated systems as well because they cannot exchange matter or energy with its surroundings

Re: exothermic vs endothermic

Posted: Thu Jan 25, 2018 3:10 pm
by Christine Wastila 1H
Calorimeters are not isolated systems. Bomb calorimeters are able to exchange heat with the surroundings, therefore classifying them as closed systems.

Re: exothermic vs endothermic

Posted: Thu Jan 25, 2018 6:41 pm
by Cynthia Tsang
The calorimeter can also be apart of the surroundings, as some calorimeters absorb some of the heat released in the reaction. In general though, the water is the surrounding and whatever you're adding is the system.

Re: exothermic vs endothermic

Posted: Fri Jan 26, 2018 8:02 pm
by Evelyn L 1H
That's why in problems with isolated systems we can use qice=-qwater

Re: exothermic vs endothermic

Posted: Sat Jan 27, 2018 11:38 am
by Wenxin Fan 1J
It depends on the context of the problem but water is considered the surroundings if something is placed in the water. However, the amount of energy absorbed by a calorimeter can be used to calculate heat released to the surroundings as well.

Re: exothermic vs endothermic  [ENDORSED]

Posted: Sat Jan 27, 2018 2:49 pm
by Jesus Rodriguez 1J
In most part problems, the water is usually seen as the surrounding but it's like the person above said, it all depends on what the question is describing