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Crystalline_Solids - CrystallineSolids Crystal= orderly,...

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    Crystalline Solids Crystal = particles are arranged in an  orderly, geometric repeating pattern
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    Amorphous solid Particles are arranged in a random  manner Sometimes called supercooled liquids
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    Melting Point Change of a solid to a liquid by the  addition of heat. Temperature that this happens is the  melting point Amorphous solids have no definite  melting point
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    Supercooled liquids Substances that retain certain liquid  properties even at temperatures at  which they appear to be solid Ex. Glass
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    Crystal Structure 3 dimensional arrangement of particles
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    Unit cell Smallest part of a crystal lattice
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    4 types of crystals Ionic – charged particles, reg.  Arranged,high melting pts, brittle, good  insulators Covalent network – large number of  atoms covalently bonded, melt at high  temperatures, nonconductors
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    4 types of crystals Metallic crystals = metal atoms  surrounded by “sea” of electrons, good  conductors Covalent molecular crystals = covalently  bonded molecules held by  intermolecular forces, low melting  points, good insulators
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