CH 12 KINETIC MOLECULAR THEORY SUPPLEMENT

CH 12 KINETIC MOLECULAR THEORY SUPPLEMENT -...

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http://www.bcpl.net/~kdrews/kmt/kmt.html Kinetic Molecular Theory The Kinetic Molecular Theory explains the forces between molecules and the energy that they possess. This theory has 3 basic assumptions. Matter is composed of small particles (molecules). The measure of space that the molecules occupy (volume) is derived from the space inbetween the molecules and not the space the molecules contain themselves. The molucules are in constant motion. This motion is different for the 3 states of matter. 1. Solid - Molecules are held close to each other by their attractions of charge. They will bend and/or vibrate, but will stay in close proximity. 2. Liquid - Molecules will flow or glide over one another, but stay toward the bottom of the container. Motion is a bit more random than that of a solid. 3. Gas - Molecules are in continual straightline motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. When the molecules collide with each other, or with the walls of a container, there is no loss of energy.
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Kinetic Molecular Theory The Kinetic Molecular Theory is a single set of descriptive characteristics of a substance known as the Ideal Gas. All real gases require their own unique sets of descriptive characteristics. Considering the large number of known gases in the World, the task of trying to describe each one of them individually would be an awesome task. In order to simplify this task, the scientific community has decided to create an imaginary gas that approximates the behavior of all real gases. In other words, the Ideal Gas is a substance that does not exist. The Kinetic Molecular Theory describes that gas. While the use of the Ideal Gas in describing all real gases means that the descriptions of all real gases will be wrong, the reality is that the descriptions of real gases will be close enough to correct that any errors can be overlooked.
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The gas consists of objects with a defined mass and zero volume. Part 1: The gas consists of objects with a defined mass and zero volume. This is based on the idea that all real gas particles are of extremely small volume. To establish uniformity among the many real gases it is assumed that they all are of the same volume. That volume is zero. While this is obviously not true, the amount of error that it introduces into the description of gases is slight and will generally be of little importance. The masses of the real gases are also generally quite small. It seems that it would be appropriate for them to also have mass values assigned at zero in order to simplify the descriptions of gases. This assumption would create a significant problem for chemists. One of the aspects of gas behavior that must be
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This note was uploaded on 05/31/2008 for the course CHM 2045 taught by Professor Mitchell during the Spring '07 term at University of Florida.

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CH 12 KINETIC MOLECULAR THEORY SUPPLEMENT -...

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