Che 111 Ch' 11 Hill Highlights

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Che 111 Ch. 11 (Hill) Highlights

• Dr. McGoldrick

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Intermolecular Forcesin Liquids and Solids

• Dipole- dipole
• H- Bonds
• London Forces

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Dipole- Dipole Attractions

• polar polar molecule attractions
• Examples CO, PH3

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Hydrogen Bonds

• Very, very strong dipole dipole
• Sml atomic size/ large delta value
• Thus, important for H bonded toN, O, F
• Examples HF, NH3 , H2O
• Water Why does ice float? ( see simulations
  liquid, ice)

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London Forces

• instant dipole-induced dipole
• Universal forces
• Important for nonpolar molecules
• Examples I2, CO2
• As mw increases, London forces increase see F2
  to I2

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Properties of Liquids

• Evaporation and Condensationheat liquid
  vapor
• ?H vap
• Equilibrium Vapor Pressure
• Boiling VP Pex
• Normal BP

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Four Inter-related Properties

• Intermolecular forces
• VP
• ?H vap
• BP

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Types of Crystalline Solids

• See summary table(p. 462)
• Categories are-
• Ionic
• Molecular
• Network
• Metallic

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Questions about Solids

• What is at lattice point?
• What holds lattice together?
• Is mp high or low?
• Malleable? Ductile?Hard? Soft?
• Electrical conductor?
• Examples?

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Cubic Unit Cells

• Primitive
• FCC
• BCC
• How many atoms per cell?
• Skim math and rest of chapter(skim p. 471- 75)

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Chapter 11 homework