Unit GG.1Properties of Gas1.gases must be compressed2.gases expand to to fill their containers uniformly3.gases may be mixed4.all gases have low density5.all confined gas exerts a constant pressure on the walls of a container uniformly in alldirectionsG.2Kinetic Molecular Theory – Ideal Gas Model1.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 totalkinetic energy – no collisions results in a loss of kinetic energy (temerature does notspontaneously 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.3Gas MeasurementsS.I. units are Pascals (Pa)Pa = 1 newton/m2Pressure = Force/Areap.s.i. = lbs/in2Torr = 1 mm Hg1 atm = 760 mm Hg = 760 torr1 atm = 1.013 x 105Pa = 101.3 kPa1 atm = 29.92 in. Hg = 14.69 p.s.i.The Volume – Temperature LawThe Volume of a fixed quantity of gas at constant pressure is directly proportional to absolutetemperatureV = kaV1= ka= V2or V1= V2TT1T2T1 T2To solve for V2: V2 = V1T2= V1T2= V1 x T2
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