Kinetics+Part+1 - 1 Kinetics Rates and Mechanisms of...

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Kinetics – Rates and Mechanisms of Chemical Reactions – Part 1 Factors That Influence Reaction Rate H 2 ( g ) + F 2 ( g ) 2HF( g ) very fast, violent, explosive reaction 3H 2 ( g ) + N 2 ( g ) 2NH 3 ( g ) very slow, requires high temp/pressure 1. Concentration – molecules must collide to react. Reaction rate is proportional to the concentration of reactants. 2. Physical State – molecules must mix to collide – the more finely divided a solid or liquid reactant, the greater its surface area per unit volume and the more contact it makes with the other reactant – thus the reaction occurs faster. 3. Temperature – molecules must collide with enough energy to react – at higher temperature more collisions occur over a unit of time – increasing temperature increases rate by increasing the number and energy of the collisions. Expressing Reaction Rate A B Rate = [A] / −∆ t Units: mol / L s Reaction rate itself varies with time as the reaction proceeds. C
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This note was uploaded on 09/30/2010 for the course EEE 4306 taught by Professor Eisenstadt during the Spring '08 term at University of Florida.

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Kinetics+Part+1 - 1 Kinetics Rates and Mechanisms of...

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