Category Archives: CHM 110 Class Notes (Summer 2012)

CHM 110: Board notes for 6/20/2012

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.

[CHM 110: 6/20/2012 notes]

Any questions? Ask here!

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.

: Formaldehyde (CH2O). This is a trigonal planar molecule. Bond angles are 120 degrees.

: Methane (CH4). This is a tetrahedral molecule with 109.5 degree bond angles.

: 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.

: 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.

: 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.

CHM 110: Board notes for 6/19/2012

Here are today’s CHM 110 notes. These notes are an introduction to Lewis structures for small molecules.

[CHM 110: 6/19/2012 notes]

Any questions? Ask here!

CHM 110: Board notes for 6/18/2012

Here are today’s CHM 110 notes. These notes cover electron configuration, periodic properties, characteristics of the main group elements, and an introduction to chemical bonds.

[CHM 110: 6/18/2012 notes]

Any questions? Ask here!