ch13 - Chapter 13 Kinetics: The Study of Rates of Reaction...

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1 Chapter 13 Kinetics: The Study of Rates of Reaction Brady and Senese 5th Edition
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Index 13.1 Five factors affect reaction rates 13.2 Rates of reaction are measured by monitoring change in concent 13.3 Rate laws give reaction rate as a function of reactant concentrati 13.4 Integrated rate laws give concentration as a function of time 13.5 Reaction rate theories explain experimental rate laws in terms of 13.6 Activation energies are measured by fitting experimental data to 13.7 Experimental rate laws can be used to support or reject proposed 13.8 Catalysts change reaction rates by providing alternative paths be
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13.1 Five factors affect reaction rates 3 Introduction Rate of reaction - the relationship between changes in concentration and time: the “speed” of a reaction
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13.1 Five factors affect reaction rates 4 Factors Affecting Reaction Rate 1. Chemical nature Bond strengths General reactivity 2. Ability to establish contact with one another Physical state Surface area for liquids, solids, and heterogeneous mixtures Amount of mixing Particle shape/size
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13.1 Five factors affect reaction rates 5 Factors Affecting Reaction Rate (Cont.) 1. Concentration of reactants Molarity for solutions Pressure effects for gases Volume effects for gases 2. Temperature 3. Catalysts
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13.1 Five factors affect reaction rates 6 Your Turn! Which of the following would speed a reaction? A. Stirring it B. Dissolving the reactants in water, if ionic C. Adding a catalyst D. Grinding any solids E. All of these
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13.2 Rates of reaction are measured by monitoring change in concentration over time 7 Measuring Rates Can be measured using any substance in the reaction Units: M s -1 Measured in three ways: Instantaneous rate (text uses this unless specified) Average rate Initial rate
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13.2 Rates of reaction are measured by monitoring change in concentration over time 8 Instantaneous Reaction Rates Instantaneous rate - the slope of the tangent to the curve at any specific time Initial rate is determined at the initial time NO 2 Appearance -0.005 0.000 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0 200 400 600 800 Time (s) [NO 2 ]
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13.2 Rates of reaction are measured by monitoring change in concentration over time 9 Slope = -0.01 M /100 s rate = 1 × 10 -4 M s -1 Instantaneous Rates Changes with Time As reactants are consumed, reaction slows The process of determining rates is important for reproducibility
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13.2 Rates of reaction are measured by monitoring change in concentration over time 10 Average Reaction Rates rate Δtime ] Δ[Reactant = Average rate of reaction - the slope of the line connecting the starting and ending coordinates for a specified time frame NO 2 Appearance -0.005 0.000 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0 100 200 300 400 500 600 700 800 Time (s) [NO 2 ]
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13.2 Rates of reaction are measured by monitoring change in concentration over time 11 Your Turn! What is the average rate
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This note was uploaded on 03/02/2010 for the course CHEM 212 taught by Professor T during the Spring '10 term at Wichita State.

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ch13 - Chapter 13 Kinetics: The Study of Rates of Reaction...

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