LECTURE7

# LECTURE7 - Midterm 1 Monday Apr 18th In class...

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1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website – guide only Solid State Structure • Amorphous solids - random ordering • Crystalline solids - well ordered – Metals - delocalized electrons – Ionic solids - charge attraction, e.g. Na + and Cl - – Molecular solids - intermolecular forces – Network solids - covalent bonds m.p=3500°C Network solid

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2 “primitive unit cell” Crystals Closely packed Crystal lattice Close-Packed Structures Courtesy: http://www.kings.edu
3 =FCC Coordination Number Simple cubic bcc

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4 Particles in Unit Cell Hexagonal close-packed 11 82 8 + 6 = 4 1 8 8 + 1 = 2 1 8 8 = 1 61 2 4 + 4 + 1 = 2  Simple cubic Find the density of Sodium. Metallic radius = 186 pm. Example 12E 22.9898 / Na M gm o l
5 Ionic Crystals • Usually cubic closed packed / fcc Anion R Cation r (2R) 2 + (2R) 2 = (2R+2r) 2 largest cation that completely fits in octahedral hole: r = 0.414R (d) Cubic hole r 0.414R r 0.225R r 0.155R r 0.732R

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LECTURE7 - Midterm 1 Monday Apr 18th In class...

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