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SUPPL INSTR FOR CH 302 (GE 206E) - answerstoPPreactionmechanisms

SUPPL INSTR FOR CH 302 (GE 206E) - answerstoPPreactionmechanisms

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Practice Problems: Reaction Mechanisms (13.7-13.10) 1. What is the molecularity of the elementary reaction (a) C 2 N 2 CN + CN; (b) NO 2 + NO 2 NO + NO 3 ? 2. What is the molecularity of the elementary reaction (a) C 2 H 5 Br + OH -   C 2 H 5 OH + Br - ; (b) Br 2 Br + Br 3. Consider the following mechanism for the formation of a DNA double helix from its strands A and B: A + B unstable helix (fast, k 1 and k 1 ’ both large) Unstable helix stable double helix (slow, k 2 very small) Derive the rate equation for the formation of the stable double helix and express the rate constant of the overall reaction in terms of the rate constants of the individual steps. 4.  State whether each statement is true or false, and if it is false, explain why:  (a) For a  reaction with a very large equilibrium constant, the rate constant of the forward  reaction is much larger than the rate constant of the reverse reaction.  (b) At  equilibrium, the rate constants of the forward and reverse reactions are equal. 
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