Enthalpy (H) Consider the reaction profile shown below. Identify the transition state(s). 2 Reaction Coordinate 5 A) 1 B) 2 C) 3 D) 2 and 4 E) 5

Reaction Time (s) 0.000 26.01 37.57 54.23 [A](M) 0.192 0.114 0.0780 0.0300 Which best describes the order of this reaction? Ozeroth O first Osecond

Pracdne o8 Consider the following reaction co-ordinate diagram H20 H20 Br A D Energy Reaction Co-ordinate a) Identify the various species on the diagram by adding the letter identifying each of the structures. b) Which species does the first transition state of the overall reaction most resemble? What kind of transition state is this? c) Which species does the second transition state of the overall reaction most resemble? What kind of transition state is this?

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0 State what rate law you would expect from this mechanism (Rate = k[Acetone]"[H*]"[[₂]') • Compare the expected rate law from the mechanism to the rate law you got from the Method of Initial rates and the Method of Isolation. If they are different, suggest 1-2 valid, specific, experimental reasons why they might be different. (fast, equilibrium) CH3 ソース H3C ག་ CH3 + H* = H3C H3C H. + H (slow) CH3 H3C CH2 + ↳2 Т + HI

3. The following reaction: A' (a) + B (ag + C (an)→ G* (ae) +2 H ) AH = -250 kJ There are two proposed mechanism: Mechanism 1 A' () + B aa) AB' a) + D (a) Step 1 AB" (a) (fast) + E (a) + Hm → G' sae) + H ) + D² (n) Step 2 (slow) Step 3 E (agi+ C (a) (fast) Mechanism 2: Step 1 AB' (a) A' (an) + B (ag) AB' (a) + C ja) (fast) Step 2 + G' (a) + 2 H() (slow) The reactions was determined to have the following rate law: r= k[A'][B] a) Which of the two proposed mechanisms is valid? Explain. b) List any reaction intermediates: catalysts: c) What is a rate determining step? d) If the activation energy for the overall forward reaction is 150 kJ, sketch the potential energy diagram for the above reaction; showing the overall reaction, the reaction mechanism, labelling the AHu, AHy, Eapu, Eag, reaction intermediates, and activated complex. rvs fwd drvs/

In comparing these two reactions, which one would occur faster via the SÃ2 mechanism and why? Reaction I CI OH- Reaction II CI 1 NH₂

Which reaction coordinate diagram (I-V) correctly describes the mechanism expected for the reaction shown? Br H3CO CH;OH II II Reaction Coordinate Reaction Coordinate Reaction Coordinate IV V Reaction Coordinate Reaction Cordinate II IV II

Can you show the mechanism?