c161l35_12_01 - Found from x-ray diffraction W There are...

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The Liquid State The Liquid State W Surface tension Resistance to increasing surface area (beading) Increases as IMFs increase W Capillary action Combination of cohesion and adhesion W Viscosity Resistance to flow Increases with increasing IMF
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Types of Solids Types of Solids W Molecular Weak interactions Low melting points (depends on polarity) Examples: Ar, CO 2 , H 2 O W Network Networks of units held together by covalent bonds Most are hard, high melting temps., non-conductors Examples: C(graphite, diamond), SiO 2 W Metalic/Ionic Very in hardness High melting temperatures Pack in very regular crystals Examples: Na, Cu, Ag, NaCl, CsCl, …
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Examples of Network solids Examples of Network solids
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Crystalline solids Crystalline solids W Unit cells and the lattice Crystals occur when atoms pack in regular, repeating patterns. The mathematical grid is the lattice. The repeating unit is the unit cell.
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Unformatted text preview: Found from x-ray diffraction. W There are more than 20 types of unit cells W We will only worry about variants of cubic Primitive cubic Face centered cubic (fcc or cpc close packed cubic) Body centered cubic (bcc) Unit cells Unit cells Lattice points Lattice points W Each atom is shared equally by all the cells that contain it. Corners = 1/8 th of an atom Edges = 1/4 th of an atom Faces = ½ an atom Body centers = whole atom W Relationships between length of side and radius is simple geometry 4r = l √ 2 for fcc Counting atoms Counting atoms W FCC 8 corners × 1/8 th per corner = 1 6 faces × ½ per face = 3 4 atoms/cell W BCC 8 corners × 1/8 th per corner = 1 1 body × 1 per body = 1 2 atoms/cell W Can find radius, density, size of cell, etc....
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c161l35_12_01 - Found from x-ray diffraction W There are...

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