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# 10-22 - Rates of Reaction OH TS CH3I H H O 1 CH3OH I H 1 C...

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E OH 1- , CH 3 I I 1- , CH 3 OH Reaction Coordinate TS H O I H C H H δ - δ - Section 9.10 Rate of  forward  reaction:  determined by the speed at  which the  reactants  can reach the transition state. OH 1- + CH 3 I CH 3 OH + I 1- Rates of Reaction Rate of  reverse  reaction:  determined by the speed at  which the  products  can reach the transition state.

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How fast can one reach the transition state for the forward reaction? OH -  & CH 3 I need to  collide   the  right way R f   =  Rate of forward  reaction concentration of  reactant  in mol/L or M rate constant (factor related  to  E forward ) Section 9.10 [OH - ]  [CH 3 I] concentration  dependent x right orientation with enough energy k f x
H O I H C H H δ - δ - How fast can one reach the transition state in reverse? CH 3 OH & I -  need to  collide   the  right way & Products I H O H C H H R r   =  Rate of reverse  reaction Section 9.10 [I - ]  [CH 3 OH] concentration of  product  in mol/L or M x k r rate constant (factor related  to  E act  reverse ) x

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(s) pure solid concentration = [1] (l) pure liquid concentration = [1] (g) pure gas concentration = pressure of gas = [mol/L] Writing Rate Laws 101 Inclusion rules apply: (aq) aqueous solute concentration = [mol/L] Section 9.11 R f   =  [reactants] coefficient k f x R r   =  [products] coefficient k r x
Writing Rate Laws 101 Gases, Solids, and Liquids: 2 Na(s) +  2 H 2 O(l)         2 Na 1+ (aq) +  2 OH 1- (aq) + H 2  (g) R = k f R = k r  [Na 1+ ]  [OH 1- ]  [H 2 ] R = k f   [reactants] Forward Rate Law: R = k r  [products] Reverse Rate Law: = k f  [Na]  [H 2 O] (s) pure solid concentration = [1] 1 (l) pure liquid concentration = [1] 1 Section 9.10

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E Reaction Coordinate E barrier (forward) Increase forward or reverse rate?
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