mcb450-3s07 - Lecture 3 Thermodynamics of Biological...

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Lecture 3 Thermodynamics of Biological Systems Please pick up a rubber band. Office Hours: Today, 1/23, 4:00-5:00 Wednesday, 1/24, 4:00-5:00
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Criterion of Spontaneity For some time it was thought that heat provided a criterion of spontaneity Heat failed, however, as demonstrated by the dissolution of ammonium nitrate in water.
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Laws of Thermodynamics First Law The energy of the universe is constant. E = q – w where E = change in internal energy; q = heat absorbed by the system; w = work done by the system Shortcoming: Internal energy fails as a criterion of spontaneity; example: ice- water transition
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Laws of Thermodynamics Second Law The entropy of the universe increases.
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Laws of Thermodynamics Third Law – The entropy of a crystalline substance at absolute zero is zero.
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Laws of Thermodynamics Combination of First and Second Laws G = H – T S Where G = change in free energy; H = change in enthalpy; S = change in entropy Dissolution of ammonium nitrate Rubber band example
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Standard-State Free Energy Change For the reaction: aA + bB = cC + dD G′ = G o ′ + RT ln {(C) c (D) d /(A) a (B) b }
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This note was uploaded on 04/07/2008 for the course MCB 450 taught by Professor Mintel during the Fall '07 term at University of Illinois at Urbana–Champaign.

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mcb450-3s07 - Lecture 3 Thermodynamics of Biological...

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