Lecture #3 1-20 - #$ 01&2 34,52 6"4'7"8$ Thermodynamics...

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6"4 7+,#"8$/ Thermodynamics applies to biochemistry, too Bioenergetics: Quantitative study of ENERGY TRANSFORMATIONS in biological systems, underpinnings of all of biochemistry F REE ENERGY CHANGE ( ! G) for a reaction quantifies energy available available to do useful work; related to change in ENTHALPY and change in ENTROPY : ! G = ! H T ! S S TANDARD FREE ENERGY change for a reaction ( ! G°) is change in free energy for going from standard conditions to equilibrium; related to equilibrium constant K eq : ! G ° = – RT ln K eq Actual ! G = ! G ° + RT ln {actual mass action ratio Q } Sign of ! G indicates direction reaction would have to go to reach equilibrium (the “ SPONTANEOUS ” direction)
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!"5&,*,- 9:;"#.<"/ Explain in conceptual terms: change in free energy ( ! G ); change in enthalpy ( ! H ); change in entropy ( ! S ). Relate ! G to ! H and ! S . Relate the sign of ! G to the direction in which reaction will go to get to equilibrium. Explain the difference between standard free energy change ( ! G °) and actual or physiological free energy change ( ! G ). Given the equilibrium mass action ratio (K eq ), calculate the standard free energy change ( ! G °).
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