Lecture 18 slides

001 g at equilibrium b will be 1100x a 16 c6h12o6

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Unformatted text preview: nship between Keq and ΔG ΔG = - RT ln Keq TAKE -HOME POINT: If you know Keq, you can calculate ΔG Equilibrium constant Keq •  if Keq = 100 (-ΔG)   at equilibrium, [B] will be 100x [A] •  if Keq = 1   at equilibrium, [B] = [A] •  if Keq = 0.001 (+ΔG)   at equilibrium, [B] will be 1/100x [A] 16 C6H12O6 + 6O2 6CO2 + 6H2O aerobic breakdown of glucose exothermic ΔG = -686 kcal/mol C6H12O6 + 6O2 6CO2 + 6H2O aerobic breakdown of glucose exothermic ΔG = -686 kcal/mol 17 C6H12O6 + 6O2 6CO2 + 6H2O aerobic breakdown of glucose exothermic ΔG = -686 kcal/mol Activation Energy •  aka Free energy of activation •  Energy required before a chemical reaction will start activation energy 18 Clicker Question! In cells, the energy of activation of a reaction is lowered by: 1.  Heat 2.  Enzymes 3.  Co-factors 4.  That can’t be done Activation Energy •  In biological systems, enzymes lower the energy of activation •  Enzymes DO NOT:   affect the Keq   affect the ΔG •  Enzymes speed up the reaction   do NOT change the thermodynamics...
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This note was uploaded on 12/09/2011 for the course BSCI 105 taught by Professor Jensen during the Spring '07 term at Maryland.

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