Bild1 L9

Bild1 L9 - Gibbs Free Energy: The portion of a system's...

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Gibbs Free Energy: The portion of a system’s energy That can perform work at constant temp and pressure Free Energy Change : Δ G= G(final state)- G(initial state) Δ G= Δ H- T Δ S Δ H = change in Enthalpy (available energy) T =Temperature in Kelvin (C+ 273) Δ S = change in entropy Δ G is negative : Reaction is thermodynamically favorable Spontaneous Exergonic Δ G is positive : Reaction is not favorable Non-Spontaneous Endergonic Δ G=0: Reaction is at equilibrium
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Example: Hydrolysis of Sucrose Spontaneous but VERY slow (years!) Add Enzyme (Sucrase) Æ speed up reaction (seconds!)
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ENZYMES SPEED UP REACTIONS BY LOWERING ENERGY BARRIERS (E A )
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E A : ACTIVATION ENERGY
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MECHANISMS ENZYMES USE TO SPEED UP REACTIONS 1) BRING SUBSTRATES CLOSE TOGETHER 2) STRESS BONDS IN SUBSTRATE Æ STABILIZE TRANSITION STATE INTERMEDIATE 3) PROVIDE A FAVORABLE ENVIRONMENT FOR REACTION TO OCCUR 4) DIRECT PARTICIPATION
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ENZYMES ARE SUBSTRATE SPECIFIC SUBSTRATE/REACTANT : what enzyme acts on can be > 1 substrate
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This note was uploaded on 04/07/2008 for the course BILD 1 taught by Professor Boulanger during the Winter '08 term at UCSD.

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Bild1 L9 - Gibbs Free Energy: The portion of a system's...

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