Chapter 9 notes

Chapter 9 notes - Chapter 9: Chemical Bonding Lecture...

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Slide No. 1 Chapter 9: Chemical Bonding ± Overview ² We learn how atomic structure and electron configurations explain how atoms combine into molecules. ± Introduction ² Major types of chemical bonding ² Valence electrons and Lewis diagrams for atoms ± Ionic Compounds ² Lewis Structures ² Lattice Enthalpy ± Molecular compounds ± Ionic and Covalent Bonds ± Reading: 9.1 – 9.5 ± Homework Problems: 8(9), 10(11), 20(21a,c), 26(27), 39(40), 50,51, 52(53), 54(55), 57(58) Lecture Outline Slide No. 2 9.1 Atomic properties and chemical bonding ± What is chemical bonding? ² Bonding is the _________ or ________ of electrons between atoms resulting in new forces that hold the atoms together. ± Types of bonds ionic bonds (9.2) covalent bonds (9.3) metallic bonds (9.5) Metals+non metals Only non metals Only metals Generally formed between: Electron transfer Electron sharing Electron pooling
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Slide No. 3 Examples of Bonding Types ± Classify the bond interactions in these substances: Example Ionic Covalent Metallic copper, Cu carbon monoxide, CO calcium fluoride, CaF 2 brass (Cu-Zn alloy) potassium sulfate, K 2 SO 4 xenon, Xe hydrochloric acid, HCl lithium niobate, LiNbO 3 graphite, C 9.1 Atomic properties and chemical bonding Slide No. 4 Valence Electrons – A Review Sb [Kr] 5s 2 4d 10 5p 3 Br [Ar] 4s 2 3d 10 4p 5 Si [Ne] 3s 2 3p 2 Cs [Xe] 6s 1 Element No. of Valence electrons Electron configuration ± Definitions of valence electrons ² Simplified: "Everything beyond the largest noble gas core" ² More sophisticated: Electrons in the highest __________________. ² Filled d 10 and f 14 sublevels are __________ from the valence level. ² Filled d and f sublevels are so stabilized by being completely filled that they become chemically inert – like part of the "core." ± How do we figure valence electrons for transition metals? ² The bonding theory for transition metals is somewhat more complex. ² We learn about that in CHEM 1036. 9.1 Atomic properties and chemical bondingc
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Slide No. 5 Valence Electron "Lewis Dot" Diagrams ± Lewis Dot diagrams are a shorthand way to represent the valence electrons (VEs) in an atom Group # VE Lewis Dot Group # VE Lewis Dot 11 1 5 5 22 1 6 6 13 3 17 7 14 4 18 8 Na Mg B C P O Cl Ne 9.1 Atomic properties and chemical bonding Slide No. 6 9.2 Ionic Bonds ± complete transfer of electrons (ionic bond) ² metal ( cation ) + nonmetal ( anion) ² atoms want noble gas electron configurations ± Sodium Chloride, NaCl Na Na + + Cl Cl + [Ne] 3s 1 Æ [Ne] + e [Ne] 3s 2
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This note was uploaded on 03/31/2008 for the course CHEM 1035 taught by Professor Jgdillard during the Fall '07 term at Virginia Tech.

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Chapter 9 notes - Chapter 9: Chemical Bonding Lecture...

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