CHEM101 Lecture Notes - Lecture 14: Rate-Determining Step, Elementary Reaction, Reaction Step

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grayelephant135

15 Mar 2016

School

University of Waterloo

Department

Chemistry

Course

CHEM101

Professor

Dr.Singh

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Document Summary

Reacion mechanisms the exact molecular pathway that staring materials follow on their way to becoming products. Each step in a muli-step reacion is called an elementary step. Elementary reacions are classiied by their molecularity the number of molecules (or atoms) on the reactant side of the chemical equaion for the elementary reacion. A + b _products, 2a _products bimolecular. A + b + c _products, 2a + b _products termolecular. Rate-determining step (rds) the slowest elementary step in a mechanism. The rds governs the rate of the overall chemical reacion because no net chemical reacion can go faster than its slowest step. Kineics: the study of the rates of chemical reacions. Molecular view _deals with the actual collisions theory, what pathways are taken by the atoms and molecules. Macroscopic view _deals with rates of the reacions, how to determine the rate and how factors afect it.

Related Questions

113. In this chapter we have seen a number of reactions in which a single reactant forms products. For example, consider the fol lowing first-order reaction: CH3NC(g) -CH,CN(g) However, we also learned that gas-phase reactions occur through collisions. a. One possible explanation for how this reaction occurs is that two molecules of CH3NC collide with each other and form two molecules of the product in a single elementary step. If that were the case, what reaction order would you expect? b. Another possibility is that the reaction occurs through more than one step. For example, a possible mechanism involves one step in which the two CH3NC molecules collide, result- ing in the "activation" of one of them. In a second step, the activated molecule goes on to form the product. Write down this mechanism and determine which step must be rate determining in order for the kinetics of the reaction to be first order. Show explicitly how the mechanism predicts first order kinetics.

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CHEM101 Lecture Notes - Lecture 14: Rate-Determining Step, Elementary Reaction, Reaction Step

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