Bio sept.28

Bio sept.28 - Chemical Reaction Reactants>Products...

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Chemical Reaction Reactants>Products Chemical bonds break new bonds form Free Energy / Potential Energy Energy available to do work Free energy= total potential of the system(including all the bond energies) More entropy= less free energy Excergonic Reaction Energy releasing reactions spontaneous reaction or downhill reaction Diffusion is an exergonic process Free energy high and Entropy Low--->Entropy high and Free energy low (after exergonic) 2H2+O2--->2H2O----> exergonic (thermodynamically unstable) BUT system is kinetically stable(energy of activation requirement is high) Endergonic Reaction Non spontaneous or uphill reaction Energy coupling Endergonic reaction cant actually occur as written Cells work by coupling endergonic reaction to exergonic reactions How can the activation energy barrier be overcome? Catalyst Does not alter free energy change of a reaction Does not make impossible reactions occur BUT does reduce the required energy of activation
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Bio sept.28 - Chemical Reaction Reactants>Products...

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