## exothermic vs endothermic [ENDORSED]

Sophie Krylova 2J
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Joined: Fri Sep 29, 2017 7:06 am

### exothermic vs endothermic

For calorimeter problems, is the water, the calorimeter, or the air (outside of the calorimeter) the surroundings?

Leah Thomas 2E
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

### Re: exothermic vs endothermic

The water is considered the surroundings because that is where the system is happening inside.

Cali Rauk1D
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Joined: Fri Sep 29, 2017 7:03 am

### Re: exothermic vs endothermic

calorimeters are always isolated systems as well because they cannot exchange matter or energy with its surroundings

Christine Wastila 1H
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Joined: Fri Sep 29, 2017 7:04 am

### Re: exothermic vs endothermic

Calorimeters are not isolated systems. Bomb calorimeters are able to exchange heat with the surroundings, therefore classifying them as closed systems.

Cynthia Tsang
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Been upvoted: 1 time

### Re: exothermic vs endothermic

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.

Evelyn L 1H
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Joined: Fri Sep 29, 2017 7:05 am

### Re: exothermic vs endothermic

That's why in problems with isolated systems we can use qice=-qwater

Wenxin Fan 1J
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Joined: Thu Jul 13, 2017 3:00 am

### Re: exothermic vs endothermic

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.

Jesus Rodriguez 1J
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

### Re: exothermic vs endothermic  [ENDORSED]

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

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