3. You propose two reaction mechanisms for a reaction you are studying. You experimentally determine that the overall reaction is 1st order with respect to (CH3)3CBr and Oth order with respect to cyanide. Which mechanism(s) is/are valid? Explain your answer. Mechanism A Step 1: (CH3)3CBr (CH3) C++ Br ->>> Step 2: (CH3)3CCN(CH3)3CCN Overall: (CH3)3CBr + CN→ (CH3)3CCN + Br Mechanism B Single-step: (CH3)3CBr +CN (CH3)3CCN + Br 4. On the axes below, draw the energy diagram of a one-step, exothermic reaction with an activation energy of 40 kJ/mol and a AH of -30 kJ/mol. Then, draw another curve corresponding to the reaction in the presence of a catalyst that reduces the activation energy by 20 kJ/mol. 100 80 Energy (kJ/mol) 80 60 40 40 20 20 reactants Reaction progress

3. You propose two reaction mechanisms for a reaction you are studying. You experimentally determine that the overall reaction is 1st order with respect to (CH3)3CBr and Oth order with respect to cyanide. Which mechanism(s) is/are valid? Explain your answer. Mechanism A Step 1: (CH3)3CBr (CH3) C++ Br ->>> Step 2: (CH3)3CCN(CH3)3CCN Overall: (CH3)3CBr + CN→ (CH3)3CCN + Br Mechanism B Single-step: (CH3)3CBr +CN (CH3)3CCN + Br 4. On the axes below, draw the energy diagram of a one-step, exothermic reaction with an activation energy of 40 kJ/mol and a AH of -30 kJ/mol. Then, draw another curve corresponding to the reaction in the presence of a catalyst that reduces the activation energy by 20 kJ/mol. 100 80 Energy (kJ/mol) 80 60 40 40 20 20 reactants Reaction progress

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter11: Chemical Kinetics: Rates Of Reactions

Section: Chapter Questions

Problem 118QRT

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