ochem lec2 - Chemistry 140A Winter 2011(K Albizati Chapter...

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Chemistry 140A Winter 2011 (K. Albizati) 1 Chapter 2 Structure and Reactivity; AlkanesChemical Thermodynamics – concerns the energy changes in chemical reactions; determines the extent to which a reaction will go to completion Chemical Kinetics – concerns the rate (speed) at which chemical reactions occur Thermodynamics-All chemical reactions are reversible -Reactants and products interconvert to varying degrees depending on their structure Consider a typical chemical reaction A+BC+DKeq=[C] [D][A] [B]Keqis directly related to the Gibb’s Standard Free Energy change via ΔGo=- RTlnKeqgenerally expressed in kcal/mole If Keq = 0.01 ΔGo= +2.7 kcal/mole If Keq = 1 ΔGo= 0 If Keq = 10,000 ΔGo= - 5.5 So….the extent to which a reaction occurs is dependent on ΔGoΔGois directly related to the bond strengths involved in the chemical reaction as well as the energy dispersal of the system
Chemistry 140A
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Basically, how fast does a system reach chemical equilibrium?
Chemistry 140A Winter 2011 (K. Albizati) 3 Where does the energy come from to get over the barrier?
Arrhenius EquationConsider A+BCReaction Rate = k[A] [B] in units of mol per liter per sec
Chemistry 140A
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