Lecture 7 - 1/20/10 (N-N-O) + (N-O) ! (N-N) + (O-N-O)...

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1/20/10 1 71 Reactants Products Energy Reaction progress ! Based on the collision shown above, what (most likely) happens to the energy in here? A) B) C) D) + (N-O) ! (N-N) + (O-N-O) (N-N-O) 72 A) How would the rate constant k change with temperature if the activation energy E a = 0, as in plot A)? A) k would increase with increasing T B) k would decrease with increasing T C) k would stay the same Arrhenius Equation k = Z 0 pe ! E a / RT For E a = 0: Collision frequency increases (a little) with increasing T k = Z 0 ( T ) p Therefore, (usually) assume pre-exponential factor A = Z 0 p independent of T 73 Reaction progress C) Reactants Products Why not C)? X Which is most energetically stable? A) Reactants B) Products C) Unknown compound(s) X Likely to be “products” 74 D) + (N-O) ! (N-N) + (O-N-O) (N-N-O) Why not D)? Multi-step reaction -“simplest” mechanism most likely - Unless demonstrated otherwise - Detect compound Y Y break 1 bond form 1 bond - Single elementary step 5. Potential Energy Profiles - potential energy as a function of reaction progress 75 Reactants E a (forward) E
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Lecture 7 - 1/20/10 (N-N-O) + (N-O) ! (N-N) + (O-N-O)...

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