chm115 - lec 27 - CHM 115 Lecture 27 Todays Lecture Reading...

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1 1 CHM 115 Lecture 27 Today’s Lecture Reading was KTT: The Chemistry of Modern Materials pp. 656-669 Solids Review of Lecture 26 Properties and Characteristics of some Crystalline Materials: Ceramics Next Lecture Review same Inter-chapter
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3 Next Week in Chemistry Lab: Check out GO , the failure to check out fee is $45 Homework #14 due Friday 12/11 at 6:00 PM Final, Tuesday 12/15, 8:00 AM Hall of Music 2 hours, 40 multiple choice questions Same drill for equipment and seats ! CoursEval 3.0: Please complete by 12/13
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4 Unit Cell Summary Net # Net # edge = edge = Unit Cell Type Unit Cell Type Atoms Atoms f(radius) f(radius) SC SC 1 1 a = 2r a = 2r BCC BCC 2 2 a = 4r a = 4r / / ( ( 3) 3) FCC FCC 4 4 a = ( a = ( 8) 8) r r
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5 The structures of simple ionic compounds In simple ionic structures space is filled as compactly as possible ions of one charge are surrounded by as many ions as possible of the opposite charge positive and negative ions touch Ionic structures are determined by two principal factors the relative sizes of the ions the ratio of the numbers of positive and negative ions in the compound
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6 NaCl Construction NaCl Construction FCC lattice of Cl - with Na + in holes Na Na + in in octahedral octahedral holes holes
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The Cesium Chloride Lattice The Cesium Chloride Lattice CsCl has a SC lattice of Cs CsCl has a SC lattice of Cs + ions with a ions with a Cl - ion ion occuping all the cubic holes in a simple cubic array. 1 unit cell has
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This note was uploaded on 03/25/2010 for the course CHM 115 taught by Professor Towns during the Fall '08 term at Purdue University-West Lafayette.

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chm115 - lec 27 - CHM 115 Lecture 27 Todays Lecture Reading...

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