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Chapter 5 - Gases_Part5 - GENERAL CHEMISTRY CHAPTER 5 GASES...

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GENERAL CHEMISTRY CHAPTER 5 – GASES P AGE 17 OF 23 The Kinetic Molecular Theory of Gases So far we have described the behavior of gases rather than on understanding the reasons for that behavior The Kinetic Molecular Theory (KMT) of gases is a model that explains the behavior of gases The KMT is based on the following assumptions or postulates: 1. A gas consists of tiny particles, either atoms or molecules, moving about in constant motion 2. The volume of the particles themselves is negligible compared with the total volume of the gas Most of the volume of gas is empty space The gas particles themselves, occupy no volume, even though they have mass 3. The gas particles act independently of one another; there are no attractive or repulsive forces between particles 4. Collisions of the gas particles, either with other particles or with the walls of a container, are elastic; that is, the total kinetic energy of the gas particles is constant at a constant T This means that when 2 gas particles collide, they may exchange energy, but there is no overall loss of energy Any kinetic energy lost by one gas particle is completely gained by the other 5. The average kinetic energy of the gas particles is proportional to the Kelvin temperature of the sample The ideal gas law can be derived mathematically from the postulates of the KMT
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