Lecture_Notes_082609

Lecture_Notes_082609 - Lecture Note 8/26/2009

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CHEMICAL KINETICS Zumdahl Chapter 12
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Why are you taking this course? Chem/Biochem majo r Pre-med student E n g in e rin s t ud Other 4% 25% 24% 47% 1. Chem/Biochem major 2. Pre-med student 3. Engineering student 4. Other
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What is a rate? y A change in something over time.
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Definitions y Chemical Kinetics – the area of chemistry that concerns reaction rates and the steps through which a reaction occurs y Spontaneity – the inherent tendency for a process to occur, has nothing to do with the speed of the reaction y Reversibility – the ability of a reaction to go both forward and backward, it is often more favorable in one direction than in the other
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Definitions y Reaction Rate – change in concentration of a reactant or product per unit time y Average Rate – rate measured over a particular time period y Instantaneous Rate – rate measured at a specific time; determine instantaneous rate by taking the slope of the line tangent to the plot of [A] versus time
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Is the speed on a spedometer an average or instantaneous rate?
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Lecture_Notes_082609 - Lecture Note 8/26/2009

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