The rest of chapter 4 that you should know from Gen Chem

The rest of chapter 4 that you should know from Gen Chem -...

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The rest of chapter 4 that you should know from Gen Chem Equilibrium Constant o K eq = o If K eq > 1, then more products than reactants o If 0<K eq <1, then more reactants than products o He may ask you to propose a K eq for a reaction based on some information. If he tells you a reaction is highly exergonic, then your K eq should be really large. Think 10 3 or higher If he tells you a reaction is highly endergonic, then your K eq should be really small. Think 10 -3 or smaller. If he wants one of these extremes and you give a value like 1.5 or .7, he won’t give full credit. ∆G=∆H-T∆S o If ∆G<0, then spontaneous This is called exergonic. o If ∆G=0, then at equilibrium o If ∆G>0, then non-spontaneous This is called endergonic. Bond-Dissociation Energies o If ∆H<0, then the reaction is exothermic. o If ∆>0, then the reaction is endothermic. o ∆H of a reaction can be estimated by
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∆H=bonds broken-bonds formed Kinetics
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Unformatted text preview: o For A + B → C + D o rate=k[A] m [B] n o The overall reaction order is m + n o A is of the mth order and B is of the nth order Activation Energy o The difference in energy from the reactants to the highest-energy transition state Transition States o Chemical species which exist fleetingly o Structure or species when bonds are breaking and/or forming all at once o Occur at the peaks of a reaction coordinate diagram Intermediates o Chemical species which occur at the troughs of a reaction coordinate diagram o Exist long enough to be isolated This means that he will not use the word fleetingly when describing them. Reaction coordinate diagrams o The number of humps is the number of steps in a reaction. o The valleys are intermediates. o At the top of each hump is a transition state. o The highest hump is the rate-determining step....
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This note was uploaded on 03/06/2012 for the course CHEM 102 taught by Professor Henshaw during the Spring '08 term at VCU.

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The rest of chapter 4 that you should know from Gen Chem -...

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