cm7 - Chapter 13- The States of Matter Gases- indefinite...

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Unformatted text preview: Chapter 13- The States of Matter Gases- indefinite volume and shape, low density. Liquids- definite volume, indefinite shape, and high density. Solids- definite volume and shape, high density Solids and liquids have high densities because their molecules are close together. Kinetic Theory Kinetic theory says that molecules are in constant motion. Perfume molecules moving across the room are evidence of this . The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles The Kinetic Theory of Gases Makes three descriptions of gas particles 1. A gas is composed of particles molecules or atoms Considered to be hard spheres far enough apart that we can ignore their volume. Between the molecules is empty space. The Kinetic Theory of Gases Makes three descriptions of gas particles 1. The particles are in constant random motion. Move in straight lines until they bounce off each other or the walls. 1. All collisions are perfectly elastic The Average speed of an oxygen molecule is 1656 km/hr at 20C The molecules dont travel very far without hitting each other so they move in random directions . Kinetic Energy and Temperature Temperature is a measure of the Average kinetic energy of the molecules of a substance. Higher temperature faster molecules. At absolute zero (0 K) all molecular motion would stop . Kinetic Energy % o f M o l e c u l e s High temp . Low temp. Kinetic Energy % o f M o l e c u l e s High temp. Low temp . Few molecules have very high kinetic energy Kinetic Energy % o f M o l e c u l e s High temp. Low temp. Average kinetic energies are temperatures The average kinetic energy is directly proportional to the temperature in Kelvin If you double the temperature (in Kelvin) you double the average kinetic energy....
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cm7 - Chapter 13- The States of Matter Gases- indefinite...

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