#2 - Announcements: My phone number will be 294-0274. Make...

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Unformatted text preview: Announcements: My phone number will be 294-0274. Make sure you have registered for the clickers and for ARIS! There is a Practice Assignment on ARIS (the first half of Chapter 9). Watch ARIS for more Assignments on Friday!!! The last lectures coverage: Lewis dot symbols (9.1) Ionic bonds (9.2) (skipping 9.3) Covalent bonds (non-polar and polar) (9.4) Electronegativity (9.5) Dipole moment (10.2) Objectives for today: Polarity of the bond, electronegativity and the dipole moment (9.2, 9.4, 10.2) Writing Lewis structures (9.6) Putting formal charges on the Lewis structures (9.7) Resonance Lewis structures (9.8) Exceptions to the Octet rule (9.9) (skipping 9.10) increasing electronegativity increasing electronegativity Electronegativity : a measure of an atoms ability to attract electrons in a bond (Linus Pauling) H F F H Polar covalent bond or polar bond is a covalent bond with greater electron density around one of the two atoms electron rich region electron poor region e- rich e- poor d + d- Dipole Moment of Polar Molecules 10.2 H F electron rich region electron poor region d+ d- m = Q x r Q is the charge r is the distance between charges 1 D = 3.36 x 10-30 C m Polar Covalent Bonds The greater is the difference in electronegativity, the more polar is the bond and the stronger is its dipole moment. 1. Draw the skeletal structure of the compound, using chemical symbols and placing bonded atoms to each other. Put the least electronegative element in the other....
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This note was uploaded on 10/21/2010 for the course CHEM 155 taught by Professor Burnett,joe during the Fall '08 term at Iowa State.

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#2 - Announcements: My phone number will be 294-0274. Make...

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