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I. Physical Properties (p. 303 - 312)

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

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I. Physical Properties (p. 303 - 312)

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

  2. 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

  3. 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

  4. 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

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

  6. D. Temperature K = ºC + 273 ºF -459 32 212 ºC -273 0 100 K 0 273 373 • Always use absolute temperature (Kelvin) when working with gases. C. Johannesson

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

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

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

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

  11. F. STP Standard Temperature & Pressure 0°C273 K 1 atm101.325 kPa -OR- STP C. Johannesson

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