CHEM 110 Lecture Notes - Lecture 15: Covalent Bond, Electronegativity, Lewis Structure
Wednesday, October 11, 2017
Molecular Geometry
CHEM 110
-VESPR Theory Interactions
•lone pair = lp
•Bond pair = bp
•lp-lp >> lp-bp >> bp-bp
-VESPR Geometry around A of…
•AX2
-Linear geometry
-2 e groups
-2 bonding groups
•AX3
-Trigonal Planar
-3 e groups
-3 bonding groups
•AX2E
-Bent geometry
-3 electron groups
-2 bonding + 1 lone pair
•AX4
-Tetrahedral geometry
-4 e groups
-4 bonding groups
•AX3E
-Trigonal pyramidal
-4 e groups
-3 bonding groups + 1 lone pair
•AX2E2
-Bent geometry
-4 e groups
-2 bonding + 2 lone pairs
1
LY
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CHEM 110 Full Course Notes
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Document Summary
Vespr theory interactions: lone pair = lp, bond pair = bp, lp-lp >> lp-bp >> bp-bp. Vespr geometry around a of : ax2. 2 bonding + 1 lone pair: ax4. 3 bonding groups + 1 lone pair: ax2e2. 4 bonding groups + 1 lp: ax3e2. 3 bonding groups + 2 lp: ax2e3. 2 bonding + 3 lone pairs: ax6. 5 bonding groups + 1 lone pair: ax4e2. Examining shapes with 2, 3, 4 e groups. Examine shapes with 5 or 6 e groups. Vespr with >1 central atom: 1. Determine # of e groups around central atom: 3. Bonding groups around each central atom: 4. write vespr formula for each central atom + sketch. Polar vs. non-polar covalent bonds: polar bonds = covalent bonds with unequal sharing of electrons, electronegativity different 0. 5 - 1. 9. Orientation of polar molecules in an electric field. Non polar molecules: no net dipole moment.
