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Chapter 12 Notes

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by: Dallin Rigby

Chapter 12 Notes Chemistry 1220

Dallin Rigby
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Volume, mass, packing efficiency, etc. for Unit Cell. Bonding in Solids.
Principles of Chemistry
Dr. Weaver
Class Notes




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This 3 page Class Notes was uploaded by Dallin Rigby on Thursday January 21, 2016. The Class Notes belongs to Chemistry 1220 at Southern Utah University taught by Dr. Weaver in Winter 2016. Since its upload, it has received 15 views. For similar materials see Principles of Chemistry in Chemistry at Southern Utah University.

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So much better than office hours. Needed something I could understand, and I got it. Will be turning back to StudySoup in the future

-Dorthy Pagac


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Date Created: 01/21/16
Chapter 12 Atom Number of Fraction of Location Unit Cells Atom Within Sharing Atom Unit Cell Corner 8 1/8 or 12.5% Edge 4 1/4 or 25% Face 2 1/2 or 50% Anywhere 1 1 or 100% else Mass Numberof Atoms∗Molar Mass UnitCell Density= = ' Volume Avogadro s Number (SideLength) Volume Face Centered Body Centered Simple Cubic 2 √r 4 2r3 r √3 Mass Face Centered Body Centered Simple Cubic 4∗Molar Mass 2∗Molar Mass 1∗Molar Mass ¿ ' ¿ ' ¿ ' Avogadro s Number Avogadro s Number Avogadro s Number Packing Efficiency Simpl Body Fac e e 0.52 0.68 0.74 Bonding in Solids The bonding in solids can be classified by the types of attractive forces. Molecular Solids - Intermolecular forces are weak. o Soft, low melting point, nonconductive. o (l) or (g) at room temperature He, H2O, CO2 Covalent Network Solids - Atoms are held together in 3 dimensions by covalent bonds. o Hard, high melting point. Diamond (carbon in sp3), graphite Metallic Solids - Array of metal cations held together by mobile electrons "Electron-Sea Model" o Wide range of hardness and melting point Conductors, malleable, ductile Ionic Solids - Ionic bond between cation and anion. - Bond strength (lattice energy) is proportional to charge of cation * charge of anion / distance (Q+ * Q-)/d o Hard and brittle Solids: nonconducting Liquids: conducting Numberof cations per formulaunitanioncoordinationnumber Number of anions per formulaunitcationcoordinationnumber *Hints* * If you have the edge length you have the volume. * If you have the atom you know the mass.


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