heat capacities

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Stephanie tran 1J
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Joined: Fri Sep 29, 2017 7:04 am

heat capacities

Postby Stephanie tran 1J » Tue Jan 30, 2018 5:42 pm

in problems where you need to find the final temperature using the equation, heat lost by ice=- heat gained by water
how do you know whether to use the heat capacity of the ice or the water in the equation?

Matthew Lee 3L
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Re: heat capacities

Postby Matthew Lee 3L » Tue Jan 30, 2018 6:08 pm

You would use the heat capacity of the ice for the ice and the heat capacity of the water for the water.

Lily Guo 1D
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Joined: Fri Sep 29, 2017 7:03 am

Re: heat capacities

Postby Lily Guo 1D » Tue Jan 30, 2018 8:31 pm

The heat capacities for ice and water are different. Therefore, you would use the heat capacity of ice for ice and the heat capacity of water for water.

RohanGupta1G
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Joined: Sat Jul 22, 2017 3:00 am

Re: heat capacities

Postby RohanGupta1G » Wed Jan 31, 2018 8:36 am

As the others said you would set the ice side equal to the water side and use the respective heat capacities in each side.

Austin Ho 1E
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Re: heat capacities

Postby Austin Ho 1E » Wed Jan 31, 2018 10:16 am

If the ice is not already at 0°C, then you must heat the ice in addition to melting it (using ΔH of fusion). Therefore, we use the specific heat of ice to heat it to 0°C, then we melt it, then we heat the now liquid water using the heat capacity of water. Likewise, with the water, we use its specific heat to find how much temperature drops.

MSkye Goldwater 2K
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Joined: Fri Sep 29, 2017 7:05 am

Re: heat capacities

Postby MSkye Goldwater 2K » Thu Feb 01, 2018 9:22 am

The energy gained by the ice is equal to the energy lost by the water. However, if the water has enough energy to heat the ice to 0 degrees C and melt it, then to get the melted ice to the final temperature you will need to use the specific heat of liquid water even though it would be on the same side of the equation as total energy change for the ice.


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