CHE102 - Lecture 7

CHE102 - Lecture 7 - 1. Problem set #2 on Mastering...

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Unformatted text preview: 1. Problem set #2 on Mastering Chemistry . Due Friday (2/1/08) at 7:00 am . 2. New reading for Friday: Ch. 15 - Equilibrium 3. Quiz 1: next week in recitation section (2/4 2/8) Chs. 13, 14 1. Thermodynamics vs. Kinetics a. Thermodynamics does the reaction go? b. Kinetics how fast is the reaction? 2. Reaction rate: change in concentration per time a. Average b. Instantaneous 3. Rate laws a. Differential: how does rate depend on concentration? b. Integrated: how does concentration depend on time? 4. Influence of temperature on reaction rate: activation energy and rate constant Ch. 14 - Kinetics Influence of Temperature on Reaction Rate 2NOCl ( g ) 2NO ( g ) + Cl 2 ( g ) Rate constant (k) increases exponentially with temperature 300 400 500 600 700 800 0.0 2.0x10 3 4.0x10 3 6.0x10 3 8.0x10 3 1.0x10 4 1.2x10 4 k (M-1 s-1 ) Temperature (K) Why does k increase with temperature? Activation Energy Activation Energy E Potential energy Reaction pathway E a Cl O Cl O N N 2NOCl 2NO + Cl 2 2NOCl ( g ) 2NO ( g ) + Cl 2 ( g ) transition state or activated complex A B A B B B A A Sample Ex. 14.10 E a = 15 kJ/mol E a = 25 kJ/mol E a = 20 kJ/mol For which reaction is k greatest? B...
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This note was uploaded on 10/10/2010 for the course CHE 102 taught by Professor Watson during the Spring '08 term at SUNY Buffalo.

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CHE102 - Lecture 7 - 1. Problem set #2 on Mastering...

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