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I. Physical Properties (p. 303 - 312) Ch. 10 & 11 - Gases I. Physical Properties (p. 303 - 312) C. Johannesson

A. Kinetic Molecular Theory 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. C. Johannesson

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

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

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

D. Temperature Always use absolute temperature (Kelvin) when working with gases. ºF ºC K -459 32 212 -273 100 273 373 K = ºC + 273 C. Johannesson

E. Pressure Which shoes create the most pressure? C. Johannesson

E. Pressure Barometer measures atmospheric pressure Aneroid Barometer Mercury Barometer Aneroid Barometer C. Johannesson

E. Pressure Manometer measures contained gas pressure U-tube Manometer Bourdon-tube gauge C. Johannesson

E. Pressure KEY UNITS AT SEA LEVEL 101.325 kPa (kilopascal) 1 atm 760 mm Hg 760 torr 14.7 psi C. Johannesson

Standard Temperature & Pressure F. STP STP Standard Temperature & Pressure 0°C 273 K 1 atm 101.325 kPa -OR- C. Johannesson