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Molecular Geometry
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Title: Molecular Geometry
Description: Honors Chemistry
January 6, 2021

 PowerPoint - Molecular Bonding & VSEPR
Pass out Covalent/Molecular Bonding Notes

Review VSEPR theory, octet rule, geometry vs. shape (geometry / shape) of molecules
.....in Group 14 (tetrahedral / tetrahedral)  e.g.  CH4, SiBr4                  AB4
.....in Group 15 (tetrahedral / trigonal pyramidal)  e.g.  NH3, PCl3           AB3E
.....in Group 16 (tetrahedral / bent or V-shape)  e.g.  H2O, H2S           AB2E2

.....possible to have expanded octet (e.g. PF6 is octahedron shaped and has 12 electrons surrounding central atom)
.....possible to have less than 8 electrons around an atom (e.g. BH3 is trigonal planar shape)

Lewis Structures show number of valence electrons around each atom.

Octet Rule - desire for each atom to have eight electrons around it.

Single bond - two electrons shared between atom designated by a single line -
Double bond - four electrons shared...designated by a double line =
Triple bond - six electrons shared...designated by three lines =

Discussed bond geometry...
      HBr          linear         180o       polar covalent
      F2             linear         180o       nonpolar covalent
     BH3                            120o       nonpolar covalent
     H2O           bent          104.5o    polar covalent
     PF3            pyramidal  107o       polar covalent

HW: None
Homework:
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