Page 1 of 1

8.1 part c

Posted: Thu Jan 11, 2018 8:47 pm
by Jessica Nunez 1I
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?

Re: 8.1 part c

Posted: Thu Jan 11, 2018 9:27 pm
by Hammad Khan 2B
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.

Re: 8.1 part c

Posted: Thu Jan 11, 2018 10:08 pm
by 404995677
Also a bomb calorimeter the mass and energy (ex:heat) of the system is not exchanged with its surroundings.

Re: 8.1 part c

Posted: Fri Jan 12, 2018 10:09 am
by Cooper1C
IMG_4781.JPG
Here is a diagram of a bomb calorimeter from the textbook (page 271)

Re: 8.1 part c

Posted: Fri Jan 12, 2018 8:49 pm
by Rachel Lu_dis1H
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.

Re: 8.1 part c

Posted: Fri Jan 12, 2018 9:07 pm
by siannehazel1B
By definition, an isolated system can't exchange matter or energy with its surroundings and a calorimeter does not allow for this exchange.

Re: 8.1 part c  [ENDORSED]

Posted: Sat Jan 13, 2018 5:05 am
by Chem_Mod
Another example of excellent discussion on Chemistry Community.

Re: 8.1 part c

Posted: Mon Jan 15, 2018 9:29 am
by Yeyang Zu 2J
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

Re: 8.1 part c

Posted: Fri Jan 19, 2018 11:10 pm
by aaron tang 2K
it is an isolated system which means that there's no interactions with the environment and heat is not given off.