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Calorimetry
is the technological process of measuring energy changes in a chemical system
Specific Heat Capacity
is the amount of energy required to raise the temperature of 1 g of a substance by 1°C or one K; depends on type of substance and state of substance
variable and units for specific hear capacity?
Specific Heat Capacity (c)... {Units: J/g°C}
formula to calculate heat?
q= mcΔT
waters heat capacity?
4.186 J/g per degree C
what does the magnitude of q tell you?
Tells you how much energy is involved.
what does the sign on q tell you
Tells you the general direction of energy transfer •
qsys=pos --> energu was transferred FROM surroundings to the sys (endothermic)
qsys=neg --> energy was transferred FROM the SYSTEM to the surroundings (exothermic)
qsystem = -qsurroundings
:0
The Second Law of Thermodynamics
When 2 objects are in thermal contact, heat is always transferred from the object at a higher temperature to the object at a lower temperature, until the 2 objects are at the same temperature (= "thermal equilibrium")
