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105 F11 Lecture 23 cmpd

105 F11 Lecture 23 cmpd - Chemistry 105 Where am I Atoms...

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Chemistry 105
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Where am I? Atoms 106 Molecules Bonding Gases Liquids Solids Energy Reactions
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What comes to mind when you think of a “gas?” What is vapor?
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What is a gas? A gas . . . is a collection of atoms or molecules Particles are far apart Particles constantly move randomly expands to fill the volume of the container. is compressible. forms homogenous mixtures with other gases. Air, He, SF6, O2
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“Air” Gas % (by vol.) Nitrogen 78.09 Oxygen 20.95 Argon 0.933 Water ~0.40 Carbon Dioxide 0.03 Neon 0.0018 Helium 0.0005 Krypton 0.0001 Hydrogen 0.00005 Nitrous oxide 0.00003 Xenon 0.000009
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Physical representation Boltzmann 3D
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Kinetic Molecular Theory Gas particles are constantly colliding. Attractions and repulsions are negligible. When molecules collide, the collision is elastic; like billiard balls, rather than clay. Collisions do not change average energy of the gas.
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Average kinetic energy Average kinetic energy of the gas where: m is mass u is a measure of speed 2 2 1 mu KE =
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Pressure Pressure is the amount of
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