070708 - Zumdahl Chapter 12 CHEMICAL KINETICS Definitions...

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CHEMICAL KINETICS Zumdahl Chapter 12
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Definitions y Chemical Kinetics – y Spontaneity – y Reversibility –
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Definitions y Reaction Rate – y Average Rate – y Instantaneous Rate –
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Reaction Rate
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Reaction Rate
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Reaction Rate y What is happening when reaction is taking place?
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Average Rate - Δ [NO 2 ]/ Δ t (M/s) Time period (s)
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Average Rate Δ [NO]/ Δ t (M/s) Time period (s)
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Average Rate Δ [O 2 ]/ Δ t (M/s) Time period (s)
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Average Rate
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Rate Law y Rate Law – y Order –
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Rate Law y Differential Rate Law – y Integrated Rate Law –
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Rate Law y The value of the rate constant depends on how the rate is defined.
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Rate Law: A Summary
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Determining the Form of the Rate Law y Consider the reaction: { 2 N 2 O 5 (soln) Æ 4 NO 2 (soln) + O 2 (g) { We are given the following information: [N 2 O 5 ] (mol/L) Rate (mol/L*s) 0.90 5.4 x 10 -4 0.45 2.7 x 10 -4
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Method of Initial Rates y Initial Rate – y Method of Initial Rates –
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Method of Initial Rates y Initial rate data at 25 o C are listed in the table below for the reaction: { NH 4 + (aq) + NO 2 - (aq) Æ N 2(g) + 2 H
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070708 - Zumdahl Chapter 12 CHEMICAL KINETICS Definitions...

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