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Chapter 9 MoCu

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VSEPR Theory Electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other.

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Polarity When two atoms bond, a dipole moment occurs. If both atoms are of even size and have the same charge, the dipole moment will be zero. o EX: CO 2 When a molecule forms, if two dipole moments with polarity are opposite, the molecule is not polar, if they are not directly opposite the molecules are polar.

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Linear - Electron-Domain Geometry Molecular: Linear Domains: 2 Total o All bonding pairs Bond Angles: 180 o Hybridization: sp Polar? No

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Trigonal Planar - Electron-Domain Geometry Molecular: trigonal planar Domains: 3 Total o All bonding pairs Bond Angles: 120 o Hybridization: sp 2 Polar? No

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Trigonal Planar - Electron-Domain Geometry Molecular: bent Domains: 3 Total o 2 bonding pairs o 1 nonbonding pair Bond Angles: 120 o Hybridization: sp 2 Polar? Yes

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Tetrahedral - Electron-Domain Geometry Molecular: Tetrahedral Domains: 4 Total o All bonding pairs Bond Angles: 109.5 o Hybridization:sp 3 Polar? No

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Tetrahedral- Electron-Domain Geometry Molecular: Trigonal Pyramidal Domains: 4 Total o 3 bonding pairs o 1 nonbonding pair Bond Angles: 109.5 o Hybridization: sp 3 Polar? Yes

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Tetrahedral - Electron-Domain Geometry Molecular: Bent Domains: 4 Total o 2 bonding pairs o 2 nonbonding pairs Bond Angles: 109.5 o Hybridization:sp 3 Polar? Yes

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Trigonal Bipyramidal- Electron- Domain Geometry Molecular: Trigonal Bipyramidal Domains: 5 Total o All bonding pairs Bond Angles: 120 o,90 o Hybridization: sp 3 d Polar? No

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Trigonal Bipyramidal- Electron- Domain Geometry Molecular: Seesaw Domains: 5 Total o 4 bonding domains o 1 nonbonding domains Bond Angles: 120 o,90 o Hybridization: sp 3 d Polar? Yes

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Trigonal Bipyramidal- Electron- Domain Geometry Molecular: T-shaped Domains: 5 Total o 3 bonding domains o 2 nonbonding domains Bond Angles: 120 o,90 o Hybridization: sp 3 d Polar? Yes

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Trigonal Bipyramidal- Electron- Domain Geometry Molecular: Linear Domains: 5 Total o 4 bonding domains o 1 nonbonding domains Bond Angles: 120 o,90 o Hybridization: sp 3 d Polar? Yes

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Octahedral- Electron Domain Geometry Molecular: Octahedral Domains: 6 Total o 6 bonding domains o 0 nonbonding domains Bond Angles: 90 o Hybridization: sp 3 d 2 Polar? No

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Octahedral- Electron Domain Geometry Molecular: Square Pyramidal Domains: 6 Total o 5 bonding domains o 1 nonbonding domains Bond Angles: 90 o Hybridization: sp 3 d 2 Polar? Yes

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Octahedral- Electron Domain Geometry Molecular: Square Planar Domains: 6 Total o 4 bonding domains o 2 nonbonding domains Bond Angles: 90 o Hybridization: sp 3 d 2 Polar? No

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Sigma Bond Pi Bond covalent bond in which electron density is concentrated along the internuclear axis. Electron densities overlap Strongest type of covalent bond covalent bond in which electron density is concentrated above and below the internuclear axis. Weaker than sigma bonds

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Problems 1. What are the electron-domain and molecular geometries of a molecule that has the following electron domains on its central atom? A) 4 bonding, 0 non bonding B) 3 bonding, 1 non bonding C) 2 bonding, 2 non bonding

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Problems 2. Do the electron-domain and molecular geometry, bond angles, polarity, hybridization and resonance structures for: A) KrF 2 B) SiCl 4 C) BCl 3

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Honors Shapes to Know: See Honors Packet – Linear – Trigonal Planar – Bent (with 3 e- regions and with 4) – Trigonal Pyramidal – Tetrahedral – Trigonal.

Honors Shapes to Know: See Honors Packet – Linear – Trigonal Planar – Bent (with 3 e- regions and with 4) – Trigonal Pyramidal – Tetrahedral – Trigonal.

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