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# gas-1 - Unit G G.1 Properties of Gas 1 gases must be...

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Unit G G.1 Properties of Gas 1. gases must be compressed 2. gases expand to to fill their containers uniformly 3. gases may be mixed 4. all gases have low density 5. all confined gas exerts a constant pressure on the walls of a container uniformly in all directions G.2 Kinetic Molecular Theory – Ideal Gas Model 1. gases are composed of molecules or atoms always moving in a straight line (pressure) 2. molecules collide with each other and with the container walls without loss of total kinetic energy – no collisions results in a loss of kinetic energy (temerature does not spontaneously decrease) 3. gas molecules are widely spaced (leads to compressibility and ability to mix) 4. volume of gas molecule is negligible compared to the total volume of a gas (0.06%) 5. gas molecules behave independently (no attraction or repulsion, ideal behavior) G.3 Gas Measurements S.I. units are Pascals (Pa) Pa = 1 newton/m 2 Pressure = Force/Area p.s.i. = lbs/in 2 Torr = 1 mm Hg 1 atm = 760 mm Hg = 760 torr 1 atm = 1.013 x 10 5 Pa = 101.3 kPa 1 atm = 29.92 in. Hg = 14.69 p.s.i. The Volume – Temperature Law The Volume of a fixed quantity of gas at constant pressure is directly proportional to absolute temperature V = k a V 1 = k a = V 2 or V 1 = V 2 T T 1 T 2 T 1 T 2 To solve for V 2 : V 2 = V 1 T 2 = V 1 T 2 = V 1 x T 2

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