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14 Cards in this Set
- Front
- Back
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thermodynamics |
the study of energy and its transformations
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thermochemistry
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branch of thermodynamics that deals with the heat involved in chemical and physical changes
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internal energy E
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sum of all potential and kinetic energies
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first law of thermodynamics |
the total energy of the universe is constant |
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units of energy |
Joule (J): 1 j = 1kg*m^2/s^2 |
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calorie |
quantity of energy needed to raise the temp. of water by 1 degree C; 1 Cal = 4.184 J |
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British Thermal Unit (BTU) |
Used to rate appliances; 1 BTU = 1055 J |
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Change in Energy |
deltaE = q (heat) + w (work) |
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sign conventions for energy |
+: heat absorbed, work done on, energy absorbed -: heat released, work done by, energy released |
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enthalpy |
chemical change at constant pressure; E + PV |
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specific heat capacity (c) |
quantity of heat required to change the temperature of 1 gram of the substance by 1 K |
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heat lost or gained (q) |
q = c * m * deltaT |
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specific heat of water |
c= 4.184 J/g*K |
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Hess's Law |
statesthat the enthalpy change of an overallprocess is the sum of the enthalpy changes of its individual steps DHoverall= DH1 + DH2 + ………. + DHn |
