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Thermochemistry
Term | Definition |
---|---|
Entropy | disorder of the universe |
Free Energy | Spontaneity of a reaction |
Enthalpy | Heat |
Exothermic | heat goes from system to surroundings |
Exothermic (sign) | deltaH is negative |
Endothermic | heat goes from surroundings to system |
Endothermic (sign) | deltaH is positive |
Hess's Law | deltaH is the same if a reaction occurs in one step or a series of steps |
Standard Enthalpy of Formation (equation) | deltaH of reaction = sum of (moles of products x deltaH of formation of products) - sum of (moles of reactants x deltaH of formation of reactants) |
Spontaneous (sign) | deltaG is negative |
Not Spontaneous (sign) | deltaG is positive |
Increasing Entropy (sign) | deltaS is positive |
Decreasing Entropy (sign) | deltaS is negative |
Spontaneity Equation | deltaG = deltaH - TdeltaS |
Calorimeter Equation | q = s x m x deltaT |