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Announcements To join clicker to class today: – Turn on the Clicker (the red LED comes on). – Push “Join” button followed by “20” followed by the “Send” button (switches to flashing green LED if successful). ● Exam 1 week from Today. ● Review Materials Posted.

Review Raoult’s law: P vap = X solvent P˚ solvent Reading phase diagrams Water’s unusual properties explained primarily by strong directional hydrogen bonding. –expansion on freezing –formation of a meniscus –surface tension –capillary action

Chapter 10 - Solids A. Crystalline materials B. Molecular solids C. Network solids D. Amorphous solids E. Metals F. Crystal Field theory (why gems are colored).

X-ray crystallography Fig 10.3

Bragg Equation n =2dsin  – n = an integer- = x-ray wavelength –d = distance between planes in crystal –  = angle as shown before at which constructive interference occurs. YOU ARE NOT EXPECTED TO DO CALCULATIONS WITH THIS EQUATION!!!

Simple cubic and body-centered Figure 10.5

Face Centered Cubic (fcc) Figure of fcc

LiF (or NaCl) Li + F-F- Fig 10.4

Octahedral holes Fig 10.8

Tetrahedral holes Fig 10.9

CsCl (interdigitated simple cubic) Fig 10.12