During this experiment, you will draw Lewis Dot Structures for a number of molecules, including some organic molecules, as well as some ions. Drawing Lewis Dot Structures is the first step in understanding how many molecules are put together, the types of bonds that they contain, their overall molecular shape, and if the molecule is polar.
VSEPR is an abbreviation for Valence Shell Electron Pair Repulsion. VSEPR uses your Lewis Dot Structures, so it is important that you draw correct structures. You can also predict the molecular shape (molecule geometry) of a molecule using VSEPR. Also, based on the arrangement of atoms around a center atom, you can predict polarity. For VSEPR, please remember that an electron domain (often referred to as electron pairs) is any electron-rich region, and can be either (i) a single electron that involved in bonding, (ii) a pair of electrons (either as a lone unbonded pair or as a bonded pair of electrons), or (iii) multiple pairs of electrons (such as double and triple bonds). The best way to understand VSEPR is to do exercises, and that is the purpose of this experiment.
View information on VSEPR Theory of Molecular Geometry Pages online. These suppplemental pages describe what VSEPR is, and how to use VSEPR to make molecular models, how to predict molecular shapes (molecule geometry), and how to predict molecule polaity, based on the number of electron domains and their arrangement around the center atom. Please note, that an electron domain is a single electron region, a pair of electrons (either lone pairs or bonded pairs), multiple pairs of electrons (such as double and triple bonds).
In order to get correct VSEPR results, you must draw Lewis Dot structures. Follow the procedures below to draw correct Lewis structures:
You should print a table using VSEPR to predict molecule geometry (shape), polarity, and electron domain arrangments for molecules having Three to Six Electron Domains. This table is more complete than the table found in your experimental protocols.
You must print the worksheets, which are available online to record your results.
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Copyright © Donald L. Robertson (Modified: 09/13/2009)