Lec-22-Chap-10-1

Lec-22-Chap-10-1 - Professor Carlos Simmerling CMM Bldg,...

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1 Professor Carlos Simmerling • CMM Bldg, Room G80 • Graduate Chemistry Bldg, Room 579 • Office hours listed on blackboard Chapter 10 Gases and the Atmosphere Common Gases and their Uses Earth’s Atmosphere Composition of Dry Air Properties of Gases • can be compressed • exert pressure on whatever surrounds them • expand into whatever volume is available • easily diffuse into one another • can be described in terms of their temperatures and pressure,the volume occupied, and the amount (number of molecules or moles) present
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2 Properties of Gases Compression of Gases Compression of Gases Gas Pressure Press ure pressure = force/area Averaged over many collisions! Press ure
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Pressure units pressure = force/area force = mass × acceleration 1 Standard Atmosphere = 1 atm 1 atm = 760 mm Hg(exactly) 760 mm Hg(exactly) = 760 torr 760 torr = 101.325 kPa 100 kPa = 1 bar Torricellian Barometer Kinetic Molecular Theory: Gases particles in continuous, random, rapid motion collisions between particles are elastic volume occupied by the particles is negligibly small effect on their behavior attractive forces between particles have a negligible effect on their behavior gases have no fixed volume or shape, take the volume and shape of the container Kinetic Energy and Temperature Gases at the same temperature have the same kinetic energy KE = ½ mv 2 (v is velocity) this is the AVERAGE kinetic energy of all of the gas molecules This kinetic energy makes the gas molecules move
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Lec-22-Chap-10-1 - Professor Carlos Simmerling CMM Bldg,...

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