Amorphous Solids - I Amorphous Solids Without shape Glass make a distinctive group o Covalent molecular crystals consists of covalently bonded molecules

Amorphous Solids - I Amorphous Solids Without shape Glass...

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I. Amorphous Solids - Without shape - Glass make a distinctive group o Covalent molecular crystals : consists of covalently bonded molecules held together by intermolecular forces. If the molecules are nonpolar weak London dispersion forces. Polar covalent held together by dipole-dipole forces and hydrogen bonding. It has: low melting point, easily vaporize, relatively soft, and good insulators I. Equilibrium - Dynamic condition in which two opposing changes occur at equal rate in a closed system. o Closed – matter cannot enter or leave o Open – energy and matter can escape o Ex. sunlight heat from burner, cooling energy enters and leaves Equilibrium and Changes of State
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Unformatted text preview: -Phase- any part of system that has a uniform composition and property-Energy of water molecule on upper surface is high → overcomes attraction and evaporates-Condensation – process by which gas changes to a liquid-Temperature and surface area is the same = rate of molecules entering vapor phase is constant o Rate depends on concentration of molecules in the vapor phase = 0 o With time, concentration increases o Rate of condensation is lower than rate of evaporation o Concentration of vapor increases where rate of condensation = rate of evaporation o Equilibrium is reached → liquid and vapor is constant...
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  • Fall '08
  • Young
  • Atom, Mole, pH, London Dispersion Forces, vapor phase, covalently bonded molecules, Covalent Molecular Crystals

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