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Week 2

by: Elizabeth Loos

Week 2 CHEM 3341 E

Elizabeth Loos
GPA 3.0

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About this Document

These are the notes for week 2. These will be on the test
Organic Chemistry 1
Shainaz Landge
Class Notes
FormalCharges, ValenceElectrons, atomic orbitals, hybridization
25 ?




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This 4 page Class Notes was uploaded by Elizabeth Loos on Friday August 26, 2016. The Class Notes belongs to CHEM 3341 E at Georgia Southern University taught by Shainaz Landge in Fall 2016. Since its upload, it has received 28 views. For similar materials see Organic Chemistry 1 in Chemistry at Georgia Southern University.


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Date Created: 08/26/16
Monday, 08/22/2016 Electron Negativity ability to pull the electrons towards itself Fluorine is the most electronegative at 4.0 C=2.5 N=3.0 O=3.5 F=4.0 Cl=3.2 Br=3.0 I=2.7 C 2 4 18 v.e NH 2 5-6=-1 Atom # of v.e- Formal Charge +1 0 -1 C 4 N 5 O 6 Bond Polarity H is 2.1 or 2.2 <.5= non polar .5-2= polar >2= ionic Polar Bonds bonding between atoms of different electronegative values results in unequal sharing of electrons Electronegativity the ability to pull electrons is relative to each other if for a pair of bonded atoms, one is more electronegative and one is less, then the bond may be polar key polar bonds to look for in organic molecules: H-F, C-F Dipole Movement hybridization- process of mixing the “pure” orbitals (sp, sp , sp ) 6 2 2 2 C- 1s 2s 2p Wednesday, 08/24/2016 *When determining hybridization, see how many objects are connected to the atom being analyzed *Since all the bond lengths of C bonds were the same, people discovered that there was 4 bonds and that they were all at the same energy level* sigma bonds are single bonds also the first in a double/triple bond Pi bonds are the second/third bond in a triple/double bond Electron Diagrams for Ethene Electron Diagrams for Ethyne
 Friday, 08/26/2016 Isomers same molecular formula with different structural arrangement Bond Length As electronegativity INCREASES, Bond Length DECREASES As you move along the Periodic Table, Bond length DECREASES As you move Down the Periodic Table, Bond Length Increases C-H>N-H>O-H>F-H Cl-H Br-H I-H Two variables define Molecular Structure 1) Bond Length 2) BondAngle Main Factors that affect Bond Length Atomic Size Bond Type Why is Bond Length important? longer bonds are weaker bonds; bond length and bond strength are related INVERSELY Molecular Geometry sp3 Tetrahedral 109.5o 2 o sp Trigonal Planar 120 o sp Linear 180 Why is geometry important? because molecules are 3D andATOMIC GEOMETRY affects the overall shape of the molecule, which affects PHYSICAL and CHEMICAL properties **The entire 3Acolumn is an EXCEPTION to the OCTET RULE


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