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Thermochemistry
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9
Chemistry
05/07/2009

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Term
Enthalpy
Definition
A measure of the heat content of a chemical system
Term
Entropy
Definition
A measure of the distribution of energy in a chemical system
Term
First Law of Thermodynamics
Definition
Law of Conservation of Energy ΔEuniverse=0
Term
Second Law of Thermodynamics
Definition
ΔS universe>0
Term
Third Law of Thermodynamics
Definition
A perfect crystal has 0 entropy at 0°K
Term
Free Energies (G)
Definition
A thermodynamic quanitiy that is the difference between the entalpy and the product of the absolute temperature and the entropy: ΔG°sys=ΔH°sys-TΔS°sys
Term
System 
Definition
The defined part of the universe under study
Term
Surroundings
Definition
All parts of the universe other than the system being considered 
Term
Universe
Definition