Term
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Definition
the amount of energy (heat) required to raise the
temperature of one gram of water by one Celsius degree.
1000 cal = 1 Cal
joule: the SI unit.
1 cal = 4.184 J |
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Term
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Definition
The amount of energy required to change
the temperature of one gram of a substance by one Celsius degree.
· Known as Specific Heat
· Symbol Cp or s
· Units: J/(goC) or cal/(goC)
· Depends on Substance and State of Matter.
· Some Common Cp's
Water (l) : 4.184 J/(goC)
Water (s): 2.03 J/(goC)
Aluminum: 0.89 J/(goC)
Gold: 0.13 J/(goC)
· Lower Cp responds faster to heating or cooling. |
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Term
| Specific Heat Capacity Equation |
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Definition
Q = s x m x (Tf - Ti)
Q: Heat
s: Specific Heat Capacity
m: Mass
Tf: Final Temperature
Ti: Initial Temperature
Tf - Ti = Change in Temperature (Delta T) |
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Term
| Heat problems involving more than one substance. |
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Definition
The magnitude of the heat (Q) lost by one object is equal to the
magnitude of the heat (Q) gained by the other object.
· One object is exothermic the other is endothermic so the Q for
one is positive while the Q for the other is negative.
· Since they are the same magnitude but different signs, we can say
0 = Q1 + Q2
· In fact when multiple objects all at different temperatures are
mixed in a sealed system, the objects transfer heat to each other
until they all reach the same final temperature. We assume no
heat is lost or gained by the surroundings.
0 = Q1 + Q2 + Q3 + ... Qz |
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