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VSEPR Theory: Molecular Geometry & Polarity Guide

Understand how to predict molecular shapes using VSEPR theory based on atom count and lone pairs. Learn bond angles for linear, trigonal planar, tetrahedral, and other geometries. Discover bond polarity with electronegativities and practice with Lewis dot structures.

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VSEPR Theory: Molecular Geometry & Polarity Guide

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  1. Section 2:VSEPR Theory&Molecular Structure and Polarity Note: Each student is to receive a molecular geometry handout

  2. Valence Shell Electron Pair Repulsion Theory: VSEPR The shape of a molecule may be predicted by the number of atoms and un-bonded electrons that surround an atom.

  3. Linear: Bond Angle: 180 degrees Lone Pairs of Electrons = 0

  4. Trigonal Planar Bond Angle = 120 degrees Lone Pairs of electrons = 0

  5. Tetrahedral Bond Angle = 109.5 degrees Lone Pairs of electrons = 0

  6. Triganol bipyramidal Bond Angle = 90 degrees and 120 degrees Lone Pairs of electrons = 0

  7. Octahedral Bond Angle = 90 degrees Lone pairs of electrons = 0

  8. square pyramidal

  9. distorted tetrahedron

  10. pyramidal

  11. nonlinear

  12. square planar

  13. T-shaped

  14. Bent

  15. Bond Polarity: When molecules develop charged sides because one atom is pulling harder on the valence electron than the other. Finding the bond polarity: Step 1: Find the electronegativities of each atom. Atoms with higher electronegativites pull harder on the electrons in bonding. Step 2: Draw arrows to the atoms with the higher electronegativities. Example: Water

  16. Find the Lewis Dot Structure, polarity, and geometry for each: • NF3 3) CH3I 2) CO2

  17. Activity: Find the Lewis Dot Structure, Geometric shape and Polarity. • H2O 2) NCl3 3) SiO2 4) CF4 *5) SF6 *6) NH3

  18. Extras • CCl4 • AsBr3 • XeF4

  19. Geometry Quiz: Find the Lewis dot structure, geometry, and polarity (20pts) • NF3 • SeH2 • CH4 • SiO2

  20. Molecular Geometry Quiz (5 pts each): Draw the lewis dot structure, draw the polarities, & name the structure • CBr4 • CS2 • NHCl2

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