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

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Presentation on theme: "C. Johannesson I. Physical Properties (p. 303 - 312) Ch. 10 & 11 - Gases."— Presentation transcript:

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

2 C. Johannesson A. Kinetic Molecular Theory b Particles in an ideal gas… have no volume. have elastic collisions. are in constant, random, straight- line motion. dont attract or repel each other. have an avg. KE directly related to Kelvin temperature.

3 C. Johannesson B. 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

4 C. Johannesson C. 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

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

6 C. Johannesson D. Temperature ºF ºC K K = ºC b Always use absolute temperature (Kelvin) when working with gases.

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

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

9 C. Johannesson E. Pressure b Manometer measures contained gas pressure U-tube ManometerBourdon-tube gauge

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

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


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