Chemistry 15 Monday, October 02, 2006

Chemistry 15 Monday, October 02, 2006 - Monday, October 02,...

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Monday, October 02, 2006 Chemistry TOGETHERNESS - Why would molecules/ions/atoms “stick together” to form a solid or a liquid Text Section 7.3 DON’T CONFUSE o In H 2 0: H Covalently bonds to O Inside Molecule o Here we look at: One molecule attracted to the next “Intermolecular forces” Intermolecular forces affect physical properties o Ex: it stronger attractive forces then higher boiling point BOILING POINTS: F 2 85K HCl 188K Br 2 322K ICl 370K DIPOLE –DIPOLE FORCES 1. F-F H-Cl Δ EN = 0 Δ EN = 0 Non-polar Polar 2. Dipole –dipole forces occur in polar molecules δ+ δ- δ+ δ- δ+ δ- dipole – dipole force (+/- attraction)
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Monday, October 02, 2006 ICl + - + - Dipole Forces - + - + Dipole Forces + - + - 3. For molecules with 1 central atom Symmetrical Asymmetrical e- groups and e- groups or temp. Atoms same temp. Atoms diff = non – polar = polar Ex. CO 2 vs. SO 2 Figure 7.8 O C O O S O Symmetrical Asymmetrical Non-polar Polar O C O S O O Polar bonds net polarity But they cancel off polar bonds don’t Cancel out
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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Chemistry 15 Monday, October 02, 2006 - Monday, October 02,...

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