9-23-08[lecture7]kl

9-23-08[lecture7]kl - CHEM 116 Lecture 7 Notes (kl)...

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CHEM 116 Lecture 7 Notes (kl) September 23, 2008 Today’s Agenda: Exam changed to next Thursday Clicker Question: Answer: B o Draw Lewis Structures Æ Figure out shapes o Strength of Dipole=Strength of Bond o More Attracted to Oxygen because Oxygen has a higher electronegativity o More electron density on oxygen than on carbon or hydrogen atoms o OH bond is very polar o CO dipole is a lot weaker than the OH dipole Explaining Macroscopic (lab level) behavior by particle level interactions: When Matter Changes, requires energy Dipole-dipole attractions predominate o Small Molecules with Large Dipoles ± Water and Ammonia are good examples London Dispersion attractions predominate o Small Molecules with nearly zero dipoles ± Chloroform (CCl 4 ) ± Between one CCl 4 molecule and another CCl 4 molecule o Large molecules, whether they have dipoles or no ± Usually the strongest forces in large molecules Particle level: materials composed of molecules: Molecules vibrate faster and faster as raise temperature
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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9-23-08[lecture7]kl - CHEM 116 Lecture 7 Notes (kl)...

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