CHE102 - Lecture 6

CHE102 - Lecture 6 - 1 Problem set#2 on Mastering Chemistry...

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1. Problem set #2 on Mastering Chemistry . Due Friday (2/1/08) at 7:00 am . 2. Current reading: Ch. 14 – Kinetics 3. New reading for Friday: Ch. 15 - Equilibrium 4. Recitation and lab check-in: last Friday (1/25) through this Thursday (1/31)
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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 Ch. 14 - Kinetics
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Reaction Order and Rate Laws Differential Rate Law: How does rate depend on concentration? 1 st order w/ respect to A 2 nd order w/ respect to A Differential rate law A] [ t A] [ Rate k = - = 2 A] [ t A] [ Rate k = - = Procedure #1: Method of Initial Rates NH 4 + (aq) + NO 2 - (aq) N 2 (g) + 2H 2 O (l)
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Reaction Order and Rate Laws Differential Rate Law: How does rate depend on concentration? 1 st order w/ respect to A 2 nd order w/ respect to A Differential rate law Integrated rate law Integrated Rate Law: How does concentration depend on time? 0 t A] ln[ A] ln[ + - = kt 0 t A] [ 1 A] [ 1 + = kt A] [ t A] [ Rate k = - = 2 A] [ t A] [ Rate k = - = How is integrated rate law determined experimentally?
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Graphical Determination of Reaction Order 0 2 t 2 ] NO ln[ ] NO ln[ + - = kt First Order Integrated Rate Law y = mx + b Is the reaction first order? 2NO
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CHE102 - Lecture 6 - 1 Problem set#2 on Mastering Chemistry...

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