Elementary Inorganic Chemistry
Elementary Inorganic Chemistry CHEM 3450
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This 2 page Class Notes was uploaded by Miss Beatrice Schoen on Sunday October 11, 2015. The Class Notes belongs to CHEM 3450 at East Carolina University taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/221366/chem-3450-east-carolina-university in Chemistry at East Carolina University.
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Date Created: 10/11/15
CHEM34 50 Page 1 Test 2 Study Guide Unit Cells Primitive BodV Centered and Face Centered Type Primitive Simple Cubic Body Centered Face Centered 9 9 0 Structure 0 O J 39 9 A ea 000 0903 0 8 atoms on corners 8 atoms on corners Description 8 atoms on corners 11n body 6 on faces Coordination 6 8 12 1 8 corner x 1 bod x 1 8 corner x 6face x Atoms per cell 8 corner gtlt 1 atom 8 y 8 2 8 2 atom 4 atoms Ed L gth 2 4T M e en r g a 7 Packing efficiency 5 2 68 74 Close Pack Arrangements Hexagonal and Cubic Close Pack Close packing Metal ions tend to pack in arrangements that maximize efficiency The maximum number of spheres that can be positioned around a single sphere 1s 12 Coordlnatlon number Is 12 Hexagonal Close Pack Cubic Close Pack Follows ABAB pattern hexagonal unit cell Follows ABCA pattern face centered unit cell CHEM 3450 P a g e 2 Test 2 Study Guide Mass and Density From unit cell radius of metal ion and molar mass Problem Aluminum ion has radium of 143 pm and crystallizes with a facecentered cubic unit cell What is the density m 2698g lmol Al 722 P 7 1sz Al m X 4 atoms 1792 X 10 g 1 Edge length l 2 57 V l3 2w7143 gtlt 1010cm3 661673 gtlt 10723cm3 M g p 661673 X10135quot3 2708 Cm3 Tetrahedral and Octahedral holes