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c161l14_10_05b - Kinetic Model Review Kinetic Molecules...

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Kinetic Model Kinetic Model - - Review Review W Molecules behave independently W Volume of particles is insignificant W Particles travel in straight lines until collisions change direction W Particles have no effect on each other except to collide
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Distribution of Speeds Distribution of Speeds W Kinetic model says average kinetic energy determined by temperature W It doesn’t mean that every molecule has the same speed W It’s the average that’s fixed by the temperature Different kinds of averages (see later) <E k > = ½m<v> 2 = 3/2RT u=(3RT/M) 1/2
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Maxwell Distribution Maxwell Distribution
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Diffusion and effusion Diffusion and effusion W When substances mix, the process is called diffusion tends to be a slow process W When one or more substances escape through a permeable barrier, it is called effusion He leaking out of a balloon is effusion W Both processes depend on temperature and molar mass Time inversely proportional Rate directly proportional A B A B B A M M t t r r = =
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