exothermic vs endothermic  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Sophie Krylova 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:06 am

exothermic vs endothermic

Postby Sophie Krylova 2J » Wed Jan 24, 2018 7:51 pm

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

Postby Leah Thomas 2E » Wed Jan 24, 2018 7:53 pm

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

Cali Rauk1D
Posts: 51
Joined: Fri Sep 29, 2017 7:03 am

Re: exothermic vs endothermic

Postby Cali Rauk1D » Thu Jan 25, 2018 12:33 pm

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

Christine Wastila 1H
Posts: 61
Joined: Fri Sep 29, 2017 7:04 am

Re: exothermic vs endothermic

Postby Christine Wastila 1H » Thu Jan 25, 2018 3:10 pm

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

Cynthia Tsang
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: exothermic vs endothermic

Postby Cynthia Tsang » Thu Jan 25, 2018 6:41 pm

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
Posts: 67
Joined: Fri Sep 29, 2017 7:05 am

Re: exothermic vs endothermic

Postby Evelyn L 1H » Fri Jan 26, 2018 8:02 pm

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

Wenxin Fan 1J
Posts: 53
Joined: Thu Jul 13, 2017 3:00 am

Re: exothermic vs endothermic

Postby Wenxin Fan 1J » Sat Jan 27, 2018 11:38 am

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]

Postby Jesus Rodriguez 1J » Sat Jan 27, 2018 2:49 pm

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


Return to “Heat Capacities, Calorimeters & Calorimetry Calculations”

Who is online

Users browsing this forum: No registered users and 9 guests