lecture 01_19_10

Lecture 01_19_10 - Today Structure of Solids(12-7/8 Energy of Solids Chapter 13(Solutions Terminology(solute solvent solution Concentration units

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1 01-19-10 Today Structure of Solids (12-7/8) Energy of Solids Chapter 13 (Solutions): Terminology (solute, solvent, solution) Concentration units Thursday (01-21-10) Colligative properties Solids • Amorphous solids – short range, but no long range order (Example Coal, made of C 6 rings and C chains) • Glassy solids – sames as above, oftern obtained from supercooled melt (Window Glass, made of SiO 2 tetrahedra) Crystalline solids - well ordered – Metals - delocalized electrons – Ionic solids - charge attraction: Na + and Cl – Molecular solids - intermolecular forces – Network solids - covalent bonds
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2 Metallic Solids • metal ions form lattice (ccp, hcp, bcc, or primitive cubic structure type • valence electrons give a delocalized electron sea (gas) •Properties • Metallic Luster • Malleable, Ductile • Electrical and Thermal Conductance Ionic Solids • Infinite network of atoms or molecules with opposite charges • Hard and brittle solids, high melting points • Low electrical conductivity
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3 Example: Rock Salt (NaCl), Coordination # 6/6 Na Cl Structure: two superimposed face centered cubic lattices B Lattice A Lattice Network Solids • infinite network of covalently linked atoms • very hard materials with high melting points
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This note was uploaded on 02/16/2010 for the course CHEM 35991 taught by Professor Osterloh during the Spring '10 term at UC Davis.

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Lecture 01_19_10 - Today Structure of Solids(12-7/8 Energy of Solids Chapter 13(Solutions Terminology(solute solvent solution Concentration units

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