(Polar molecules, Non-polar molecules, etc.)
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Hopefully we will learn more about shapes in lecture or discussion. I found this website that does a good job in explaining the different molecular shapes: http://intro.chem.okstate.edu/1314F00/L ... VSEPR.html
I don't think Dr. Lavelle has mentioned the trigonal pyramidal shape, but it is the answer to question 4.7 in the 6th edition. It also says that the bond angles are 109.5 degrees (which is the same angle as a tetrahedral shape) so are these two shapes the same?
I think we have to be able to name the different shapes but its important to note that shape is different than the electron arrangement, the shape is named after the how the molecule looks (excluding lone pairs) so its possible for some vsepr models to have the same angles as there can be a lone pair repulsing the other atoms in place of an atom, which is where h2o gets its bent shape there are two lone pairs that are repulsing the h atoms giving the molecule a bent shape.
KarlaArevalo4D wrote:I think we might (should) get like the general shapes and structures on the formula sheet, at least that is what a past chem prof. gave us not to sure
The formula sheet is posted online and doesn't have any of the shapes on it
What you have to be able to do is correlate Lewis structures to proper VSEPR shapes. For example, if I give you IF5 (since it is AX5E), you need to know that it would be square pyramidal, although the shape you draw wouldn't have to reflect 3D structure.
Alma Carrera 3C wrote:I don't think Dr. Lavelle has mentioned the trigonal pyramidal shape, but it is the answer to question 4.7 in the 6th edition. It also says that the bond angles are 109.5 degrees (which is the same angle as a tetrahedral shape) so are these two shapes the same?
The trigonal pyramidal I think is the same as tetrahedral shape, except instead of one of the bonds, there is a lone pair.
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