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Lecture Comments (2)

1 answer

Last reply by: Azizou Salami
Wed Feb 10, 2016 9:51 AM

Post by Virginia Vizconde on October 16, 2014

Why is it that the video always stopping?

Vapor Pressure, Boiling Point, Phase Diagrams

  • Vapor pressure of liquid: example of equilibrium, equal and opposite rates of evaporation and condensation

  • B.p. temp. at which v.p. = external P.

  • Normal b.p. temp. at which v.p. = exactly 1 atm. or 760 torr.

  • Reduce pressure, reduce b.p. Vacuum distillation

  • Intermolecular forces and surface tension; viscosity

  • Enthalpy of vaporization > enthalpy of melting due to total breaking of intermolecular forces

  • Learn how to draw a general phase diagram

  • Significance of: triple point; critical point; difference between dense gas and liquid is absence of surface

  • Supercritical carbon dioxide – useful solvent

Vapor Pressure, Boiling Point, Phase Diagrams

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.

  • Intro 0:00
  • Vapor Pressure: An Equilibrium Phenomenon 0:55
    • Thought Experiment: Water Equilibrium
  • Boiling Point and Normal Boiling Point 6:19
    • Reducing Boiling Point
    • Example: Water
  • Surface Tension 14:12
    • Example: Water
  • Viscosity 19:53
    • Intermolecular Forces
    • Example: Ethanol, Antifreeze, Glycerol
  • Enthalpies of Phase Changes 28:08
    • Example: Water
  • Phase Diagrams (Water) 32:22
    • Vapor Pressure Curve
    • Melting Point Line
    • Triple Point
    • Critical Point
  • Phase Diagrams (Carbon Dioxide) 38:42
    • Sublimation
    • Critical Point
  • Triple Point and Critical Point 44:54
    • Example: Carbon Dioxide