Midterm Winter 2012 #1A and B

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KaylaH
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Midterm Winter 2012 #1A and B

Postby KaylaH » Sun Feb 07, 2016 6:00 pm

Why is the equation -q(ceramic)=+q(water)? I understand the qsys=-qsurr equation, so why is it the way that they wrote it with the ceramic being negative? Isn't the ceramic brick the system?

Also, in question #1B it has the same thing where qrxn is negative and qcalorimeter is positive (-qrxn=+qcalorimeter).
Is it because the surroundings are isolated?

Mikyla Reta 2J
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Midterm Winter 2012 #1A and B

Postby Mikyla Reta 2J » Tue Feb 09, 2016 10:32 am

For 1A, I think it is because the heat that the brick gained is now being lost to the water. As a result, the negative q for the brick represents the loss of heat and the positive q for the water represents the gain of the heat that the brick lost. Hope this helps


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