8.1 part c  [ENDORSED]

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Jessica Nunez 1I
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Joined: Thu Jul 13, 2017 3:00 am

8.1 part c

Postby Jessica Nunez 1I » Thu Jan 11, 2018 8:47 pm

Identify the following systems as open, closed, or isolated:
(a) coffee in a very-high-quality thermos bottle;
(b) coolant in a refrigerator coil;
(c) a bomb calorimeter in which benzene
is burned;
(d) gasoline burning in an automobile engine;
(e) mercury in a thermometer;
(f) a living plant.

I'm a lil confused as to why a bomb calorimeter in which benzene is burned is considered an isolated system?

Hammad Khan 2B
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Re: 8.1 part c

Postby Hammad Khan 2B » Thu Jan 11, 2018 9:27 pm

This is because an isolated system is where there is no contact with surroundings. A bomb calorimeter is made such that whatever is happening outside it never affects the water that the bomb calorimeter is usually in. As such, it has no contact with its surroundings and it is an isolated system.

404995677
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Re: 8.1 part c

Postby 404995677 » Thu Jan 11, 2018 10:08 pm

Also a bomb calorimeter the mass and energy (ex:heat) of the system is not exchanged with its surroundings.

Cooper1C
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Re: 8.1 part c

Postby Cooper1C » Fri Jan 12, 2018 10:09 am

IMG_4781.JPG
Here is a diagram of a bomb calorimeter from the textbook (page 271)

Rachel Lu_dis1H
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Re: 8.1 part c

Postby Rachel Lu_dis1H » Fri Jan 12, 2018 8:49 pm

A bomb calorimeter would be an isolated system because it has no contact with its surroundings. It can't release energy or mass and the outside also doesn't affect the system.

siannehazel1B
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Re: 8.1 part c

Postby siannehazel1B » Fri Jan 12, 2018 9:07 pm

By definition, an isolated system can't exchange matter or energy with its surroundings and a calorimeter does not allow for this exchange.

Chem_Mod
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Re: 8.1 part c  [ENDORSED]

Postby Chem_Mod » Sat Jan 13, 2018 5:05 am

Another example of excellent discussion on Chemistry Community.

Yeyang Zu 2J
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Re: 8.1 part c

Postby Yeyang Zu 2J » Mon Jan 15, 2018 9:29 am

Since the purpose of the device is measure the heat of the substance released by burining it. Therefore, there should be no heat transfer between the device and environment

aaron tang 2K
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Re: 8.1 part c

Postby aaron tang 2K » Fri Jan 19, 2018 11:10 pm

it is an isolated system which means that there's no interactions with the environment and heat is not given off.


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