Chemistry_1031_day36_042409_actual

Chemistry_1031_day36_042409_actual - General Chemistry I...

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General Chemistry I: 1031 Dr. Jonathan M. Smith Fridday, April 24 General Chemistry I CHE-1031
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Today The Chemical bond! Ch. 9 Bond formation Types o Ionic energetics o Covalent Pure Polar Lewis dot structures Continue reading Chapter 9 Look for Mastering Chemistry problems
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Chemical bonds! A way to measure the bonds that hold together a single molecule is developed by Cornell physicists http://www.news.cornell.edu/releases/June98/vibrate.bs.html
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Chemical Bonds!!! Chapter 9
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Tro, Chemistry: A Molecular Approach 5 Energetics of Ionic Bond Formation the ionization energy of the metal is endothermic Na( s ) Na + ( g ) + 1 e Δ H° = +603 kJ/mol the electron affinity of the nonmetal is exothermic ½ Cl 2 ( g ) + 1 e Cl ( g ) Δ H° = 227 kJ/mol generally, the ionization energy of the metal is larger than the electron affinity of the nonmetal, therefore the formation of the ionic compound should be endothermic but the heat of formation of most ionic compounds is exothermic and generally large; Why? Na( s ) + ½ Cl 2 ( g ) NaCl( s ) Δ f = -410 kJ/mol
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Tro, Chemistry: A Molecular Approach 6 Ionic Interactions electrostatic attraction is nondirectional!! no direct anion-cation pair
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This note was uploaded on 05/09/2010 for the course CHEM 1031 taught by Professor Thomas during the Spring '06 term at Temple.

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Chemistry_1031_day36_042409_actual - General Chemistry I...

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