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States of Matter, Intermolecular Forces, Gases and Gas laws

  • States of matter are solid (s), liquid (l), and gas (g)

  • Phase changes have names: freezing/melting; boiling/condensing

  • Solid going directly to gas: subliming; example dry ice, CO2(g)

  • Forces between particles in decreasing order of strength are: ionic; ion/dipole; hydrogen bonding; dipole/dipole; London (dispersion)

  • H-bonding only for O…H; N…H; F…H

  • H-bonding very important in proteins, nucleic acids

  • The atmosphere: nitrogen, oxygen and 1% argon

  • Pressure = F/A

  • Units of pressure can be Pascals (SI); atmospheres (1 atm. = 760 mm Hg = 760 torr)

  • Kinetic molecular theory models gases as rapidly randomly moving molecules

  • Ideal gas law (includes other gas laws) PV = nRT; watch for consistency of units.

  • Molar mass of gas from gas density measurements: PV = (m/M)RT

States of Matter, Intermolecular Forces, Gases and Gas laws

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Advanced Placement Chemistry