Physical Properties Gases. Kinetic Molecular Theory b Particles in an ideal gas… have no volume. have elastic collisions. are in constant, random, straight-

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Presentation transcript:

Physical Properties Gases

Kinetic Molecular Theory b Particles in an ideal gas… have no volume. have elastic collisions. are in constant, random, straight- line motion. don’t attract or repel each other. have an avg. KE directly related to Kelvin temperature.

Real Gases b Particles in a REAL gas… have their own volume attract each other b Gas behavior is most ideal… at low pressures at high temperatures in nonpolar atoms/molecules

Characteristics of Gases b Gases expand to fill any container. random motion, no attraction b Gases are fluids (like liquids). no attraction b Gases have very low densities. no volume = lots of empty space

Characteristics of Gases b Gases can be compressed. no volume = lots of empty space b Gases undergo diffusion & effusion. random motion

TemperatureTemperature ºF ºC K K = ºC b Always use absolute temperature (Kelvin) when working with gases.

PressurePressure Which shoes create the most pressure?

PressurePressure b Barometer measures atmospheric pressure Mercury Barometer Aneroid Barometer

PressurePressure b KEY UNITS AT SEA LEVEL kPa (kilopascal) 1 atm 760 mm Hg 760 torr 14.7 psi

STPSTP Standard Temperature & Pressure 0°C 273 K 1 atm kPa -OR- STP