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2 Pages

### chem cheat sheet

Course: CHEM 6C, Winter 2011
School: UCSD
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Word Count: 331

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Chateliers Le Principle Disturbances: concentration, pressure, and temperature Shift in eqm RXN Shift in eqm RXN Change in Concentration -System reacts in the direction that reduces the change - eqm shifts when on left - eqm shifts when on right - disturbance is reduced but not eliminated, position of eqm shifts Change in Pressure/Volume - adding inert gas has no effect - change in V = change in [C] -...

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Chateliers Le Principle Disturbances: concentration, pressure, and temperature Shift in eqm RXN Shift in eqm RXN Change in Concentration -System reacts in the direction that reduces the change - eqm shifts when on left - eqm shifts when on right - disturbance is reduced but not eliminated, position of eqm shifts Change in Pressure/Volume - adding inert gas has no effect - change in V = change in [C] - change in P b/c of V does not change Kc - if V P RXN shifts so that total no. of gas , molecules &(vice versa) -if ngas=0, no effect on eqm positin Change in Temperature - T will K for system w/ Hrxn >0 - T will K for system w/ Hrxn<0 Fp depression: Tf = imKf Osmotic Pressure: = iMRT Exothermic heats w/H2O: (SO32-, SO2-4, SeO42-, AsO4-, PO42-) solubility in H2O as T and S >0 K = [Products]eq/[Reactants]eq Q= [Products]/[Reactants] Q<K Reactants @ products Q>K Eqm G = 0, G = -RTlnK K = exp(- G/RT) G < 0 right G > 0 left If G > 0 spontaneous backwards K > 1 : more products K < 1 : more reactants G = G + RTlnQ K vs T: exo H <0, T, K reactant , K vs T: endo H >0, T, K product , A+heat B endo T K A B +heat exo T K K = exp(- H/RT - S/R) Ion pair formation: lower i,: VP BP FP CH4 (g) CH4(aq) : K is greater @ lower T Acids and Bases HA + H2O <--> H3O+ + AKa = [H3O+][A-] / [HA] pKa = -logKa A- + H2O <--> HA + OHKb= [HA][OH-] / [A-] pKb= -logKb Ka x Kb = Kw -- Kw = 1 x 10-14 Ionization weak acid: [c] %I [H3O+] pH , , , weak base:: [c] , [OH-] pH ,%I , strong acid/base: 100% ionization Acidity icreases with charge Acidity with smaller radius R = 8.3145 J/K-mol Daltons Law of Partial Pressure: Ptot=Pa+Pb Higher B.O shorter Bond stronger
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