Lecture 18 - Lecture 18Kinetics Text: Atkins Chapter 13,...

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Lecture 18—Kinetics Text: Atkins Chapter 13, pages 529-547 and 554-564 Equilibria describe the relative concentrations of species when ∆G = 0 and the concentrations are not changing over time. Kinetics describes the rate at which chemical transformations occur. Usually, changes in concentration are observed. It is possible to observe that concentrations are not changing even though the system is not at equilibrium. This is because the rates are too slow. It is possible to observe that species interconvert even though the system is at equilibrium. In such a case, the species balance each other, and the concentrations do not change. Once again, equilibrium describes systems that appear constant over time and have ∆G = 0. Kinetics describes rates of transformations . If a system is not at equilibrium, then kinetics describes how fast the concentrations change. Once equilibrium is reached, the concentrations do not change any further. If the equilibrium constant is very high, then the reaction ends when essentially all of the
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This note was uploaded on 09/29/2009 for the course ME 530.230 taught by Professor Katz during the Spring '09 term at Johns Hopkins.

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Lecture 18 - Lecture 18Kinetics Text: Atkins Chapter 13,...

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