CH 301 Chapter 5 notes part2v2

CH 301 Chapter 5 notes part2v2 - Chapter 5: Liquids and...

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Chapter 5: Liquids and Solids: CONDENSED phases of matter. The Unit Cell -Introduction smallest complete repeat unit of crystal lattice - can often be shown in more than one way BUT must reflect the EMPIRICAL FORMULA of the compound ALL possible crystal structures summarized by 14 BRAVAIS LATTICES 6 parameters: length, width, height (a,b,c) ; angles between the 3 sides ( α,β,γ ) get increasingly complex; some have atoms at corners only; others also in the sides, or center of cell. You will NOT be tested on the Bravais Lattices! Interpreting a Unit Cell You can determine how many atoms of each element are in a unit cell if it is shown. (Imagine cutting them up, as if they were clay spheres.) Atoms at a VERTEX : 1/8 of the atom. Atom in a FACE : 1/2 of the atom. Atom in the CENTER : ALL of the atom Atom in the EDGE : ¼ of the atom Example: Metallic Solids Two close packed structures are common: cubic close-packed (CCP) ; hexagonal close packed (HCP) BOTH have a COORDINATION NUMBER (number of nearest neigbors)
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This note was uploaded on 09/02/2009 for the course CHE 301 taught by Professor Fatimafakhreddine during the Spring '08 term at University of Texas at Austin.

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CH 301 Chapter 5 notes part2v2 - Chapter 5: Liquids and...

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