1. Thursday, November 20, 2014 Objective: Students will use VSEPR theory to predict the shapes of molecules. Warm-Up: Draw the Electron Dot Diagrams for the following molecules: NO3 C Cl4 Agenda: 1. VSEPR Theory Notes and Video

2. VSEPR Theory

3. Introduction VSEPR stands for valence shell, electron pair repulsion.
The VSPER Theory states that repulsion between sets of valence electrons surrounding an atom causes these sets to be oriented as far apart as possible.
Remember: opposite charges attract and like charges repel each other.

4. VSEPR
The properties of molecules depend not only on the bonding of atoms, but also on molecular geometry or the 3-dimensional arrangement of a molecule’s atoms in space.
What determines the 3-D shape of a molecule?
The repulsion of the electron pairs around the central atom.
All the electron pairs will try to get as far away from each other as possible.
Each lone pair, single/double/triple bond in a Electron Dot diagram represents a region of electron density.

5. VSEPR
There are many shapes that a molecule can take, depending on the number of atoms that are bonded and the number of lone electron pairs.
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6. Brain Break: Human Knot

8. How to use VSPER to predict Molecule Shapes
Draw the Electron Dot Diagram for the molecule.
Determine the number of bonded atoms and lone electron pairs around the central atom.
Use the VSEPR chart to determine the generic formula and shape of the molecule.

9. Brain Break: Class Walk