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.
- Intro
- States of Matter: Solid, Liquid, Gas
- Phase Transitions
- Ionic Forces and Ion Dipole Forces
- Dipole-Dipole Forces and Hydrogen Bonding
- Example: Water Molecules
- Example: Liquid Hydrogen Chloride
- Strong Dipole-Dipole, Hydrogen Bonds
- Boiling Points
- Dispersion or London Forces
- Hydrogen Bonding in Water and Biological Systems
- Gaseous State: Kinetic Molecular Model
- Gases of the Atmosphere
- Pressure
- Units of Pressure
- Gas Laws and the Ideal Gas Law
- Example: Gas Law Calculations
- Molar Mass from Gas Law Calculations
- Additional Example 1
- Additional Example 2































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