9.2 – 9.3 VSEPR Shapes and Molecular Polarity

When we draw molecules using the VSEPR theory, we first must identify the central atom, determine its valence electrons, then look at how many electrons the central atom will share with its surrounding atoms, or ligands. The videos shown below considers central atoms with either H, a halogen, or an OH group as ligands. For each molecule we will determine its molecular geometry, electron domain geometry, polarity, and the hybridization on the central atom.

9.2 – 9.3 AXn (X = H, X, OH) VSEPR Shapes and Polarity Part 1

9.2 – 9.3 AXn (X = H, X, OH) VSEPR Shapes and Polarity Part 2

9.2 – 9.3 AXn (X = H, X, OH) VSEPR Shapes and Polarity Part 3

We continue with VSEPR theory, as the videos shown below considers central atoms with either an O or an S as ligands. For each molecule we will determine its molecular geometry, electron domain geometry, polarity, and the hybridization on the central atom.

9.2 – 9.3 AXn (X = O, S) VSEPR Shapes and Polarity

We continue with VSEPR theory, as the video shown below considers central atoms with either an O or an S as ligands where a double bond is required to reach an octet. When a double bond is required to reach an octet, various structure can result with different energies. If molecules have different energies we cannot consider them to be resonance structures. We will use formal charges to determine which structure is the best one.

9.2 – 9.3 AXn (X = O, S db required) VSEPR Shapes and Polarity Part 1

9.2 – 9.3 AXn (X = O, S db required) VSEPR Shapes and Polarity Part 2

9.2 – 9.3 AXn (X = O, S db required) VSEPR Shapes and Polarity Part 3

When drawing Lewis Structures to represent shapes of molecules, you may have to make a choice between satisfying the Octet Rule or Using Formal Charges to best represent each molecule. There is still debate between researchers and the following video explains why this is the case.

9.2 – 9.3 Formal Charge vs. The Octet Rule

Another scenario we encounter in VSEPR theory is a central atoms with both H, X, or OH and an O or an S as ligands. We will also use the rules from the previous video to predict the actual shape of the molecule.

9.2 – 9.3 AXn (X = both H, X, OH and O,S) VSEPR Shapes and Polarity

The last scenario we encounter in VSEPR theory is oxyacids. Once we rewrite each formula in a more convenient way, we can use all the rules from the previous videos to predict the actual shape of oxyacids.

9.2 – 9.3 AXn VSEPR Shapes of Oxyacids

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>