Lecture 5 notes 9-19

Lecture 5 notes 9-19 - Lecture 5 Thermodynamics Kinetics...

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Lecture 5 – 9-19-07 Salt dissolves spontaneously in water - is dissolved salt energetically more favorable than being in a salt crystal? Energy – a property of individual atoms and molecules (kinetic, potential) First law of thermodynamics – conservation of energy - Total energy in universe can’t change - E(universe) = A constant or ∆E(universe)= 0 Entropy – a property of an ensemble of atoms & molecules - Measures the degree of disorder inherent in an ensemble of molecules - The more ordered the molecules are, the less random (less entropy) Second law of thermodynamics – increase of entropy - Total entropy of the universe cannot decrease - ∆S(universe) > 0 - Solvation is entropically favorable (ordered arrangement to disordered arrangement of atoms in liquid), but dissolving NaCl is actually energetically unfavorable Which reactions occur spontaneously? Those which reduce free energy . Free energy
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Lecture 5 notes 9-19 - Lecture 5 Thermodynamics Kinetics...

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