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Which Water Is The Energy Giver In This Case

Content type
User Generated
Subject
Physics
School
San Diego Mesa College
Type
Homework
Rating
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Which water is the energy giver in this case, the Cold H
2
O or the Hot H
2
O? How
do you know?
Hot H
2
O is energy giver . I know it by knowing the fact that the hot and cold water with
same amount of molecules have same rest mass, but kinetic energy of hot water is bigger
because hot water molecules are moving faster than cold water molecules.
Which water is the energy receiver in this case, the Cold H
2
O or the Hot H
2
O?
How do you know?
Cold H
2
O is energy receiver .
I know it by knowing the fact that the hot and cold water with same amount of
molecules have same rest mass, but kinetic energy of hot water is bigger
because hot water molecules are moving faster than cold water molecules.
Giver
Receiver
Mass (m) (in g)
100
100
 
) (in
0
C)
(35-50)=-15
(35-20)=15
Known Specific Heat
Capacity
(in cal/g C
0
)
1.00
1.00
(in calories)
-1500
1500
Was the Heat lost by the Energy giver equal to the Heat gained by the energy
receiver? In the “real world” what could happen in the experiment so that the
Heat lost is NOT equal to the Heat gained?
The temperature of Hot water will decrease, and the temperature of cold will
increase, until the two substances have the same temperaturethat is, when they
reach thermal equilibrium. If this occurs in a calorimeter, ideally all of this heat
transfer occurs between the two substances, with no heat gained or lost by either
the calorimeter or the calorimeter’s surroundings. Under these ideal
circumstances, the net heat change is zero:
Qhot water+Qcold water=0
This relationship can be rearranged to show that the heat gained by substance hot
water is equal to the heat lost by substance cold water:
Qhot water=-Qcold water
The magnitude of the heat (change) is therefore the same for both substances, and
the negative sign merely shows that Q
hot
water and Q
cold
water are opposite in
direction of heat flow (gain or loss) but does not indicate the arithmetic sign of

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 Which water is the energy giver in this case, the Cold H2O or the Hot H2O? How do you know? Hot H2O is energy giver . I know it by knowing the fact that the hot and cold water with same amount of molecules have same rest mass, but kinetic energy of hot water is bigger because hot water molecules are moving faster than cold water molecules.   Which water is the energy receiver in this case, the Cold H2O or the Hot H2O? How do you know?  Cold H2O is energy receiver . I know it by knowing the fact that the hot and cold water with same amount of molecules have same rest mass, but kin ...
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