Here are today’s CHM 110 notes. These notes cover expanded valence, formal charge, and basic VSEPR. These are the last notes for the summer 2012 CHM 110 lecture course.
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Daily Archives: June 20, 2012
CHM 110: Molecular shapes gallery
Here is a gallery of examples of the various molecular shapes rendered in 3D with a molecular modeling program.. Some of these renderings are in your notes already, but some were not.
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- Formaldehyde (CH2O). This is a trigonal planar molecule. Bond angles are 120 degrees.
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- Methane (CH4). This is a tetrahedral molecule with 109.5 degree bond angles.
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- Ammonia (NH3). This is a pyramidal molecule. Bond angles are similar to the tetrahedral 109.5 degrees due to the presence of a lone pair of electrons on the nitrogen atom.
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- Water (H2O). This is a bent molecule. Bond angles are similar to the tetrahedral 109.5 degrees, since there are two lone pairs on the oxygen atom that act like other atoms.
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- Sulfur hexafluoride (SF6). This is an octahedral molecule with 90 degree bond angles. Note: This geometry can only be assumed by an expanded valence molecule.
