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Chemistry is the study of matter. Heat is basically a temperature rises, solved questions on difference between temperature and heat.
Typology: Exercises
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Temperature is a measure of the average kinetic energy and does not depend upon the amount of matter in the sample. Heat is the total kinetic energy that flows because of a difference in temperature and does depend on the amount of matter.
Kinetic Energy
cannot
specific heat capacity
Changes in energy
heat
Potential Energy
Raise 1 gram of a substance 1OC.
The aluminum has a lower specific heat than the food (specifically the water in the food) and it therefore heats up and cools off more quickly. A lot of heat must be released before the water will change its temperature even one degree.
The temperature will NOT increase during phase changes. During a phase change, the heat is making the solid turn to liquid or the liquid turn to steam rather than increasing the temperature.
Q = m x Δ Hvap or Q = m x Δ Hfus
Because there is no change in temperature.
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325 J = ( m ) (4.184 J g o^ C
m =
g
o C
= 6.81g
2
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-6.4x10 2 J = (500 g)(C)(-30.0 ° C)
-6.4x
2 J
(500 g)(-30.0 ° C)
g o^ C
o
Q = m x C x Δ t Δ t = 87ºC - 76ºC = 11ºC Q = 275 g x 4.184 J/goC x 11°C = 13000 J
Q = m x C x Δ t Δ t = 69.2ºC - 31.7ºC = 37.5ºC Q = 96.7 g x 0.874 J/goC x 37.5ºC = 3170 J
Q = m x C x Δ t Δ t = 36.4ºC – 25.0ºC = 11.4ºC
Q = m x C x Δ t Δ t = 25.0°C - 55.0°C = - 30.0°