Lecture #10 - Chemistry 2A-c w2009 (Ch6-1)72 GASES I....

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Chemistry 2A Chemistry 2A -c w2009 c w2009 (Ch6 (Ch6 -1)72 1)72 GASES GASES I. General properties of gases There are physical laws for gases, solids, and liquids . Increasing the temperature of a solid at constant pressure cause phase changes: depend on (P, V, T) Solid Liquid Gas (gas - small molecules like CO 2 , H 2 S, CH 4 ) (Solid and liquid are considered condensed phases and incompressible) Weak intermolecular forces in gases leads to a low density, compressibility, and formation of homogenous mixtures. Also, there is lots of empty space between molecules. Compressibility Rapid diffusion High thermal expansion
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Chemistry 2A -c w2009 c w2009 (Ch6 (Ch6 -2)73 2)73 II. Gas Laws Macroscopic variables Volume (space): V (in liters, L) Temperature : T (in Kelvin, K) Pressure : P (in atmosphere, atm) Amount : n (in mol) Molecules (or atoms) in the gas phase have collisions with the walls of a container, this creates pressure (force/area). P = Force/Area = N/m
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Lecture #10 - Chemistry 2A-c w2009 (Ch6-1)72 GASES I....

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