Square Pyramidal

(Polar molecules, Non-polar molecules, etc.)

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Drake_Everlove_1K
Posts: 19
Joined: Sat Sep 24, 2016 3:02 am

Square Pyramidal

Postby Drake_Everlove_1K » Wed Nov 02, 2016 2:29 pm

So I have encountered varied answers to this question and want something final.

Does the square pyramidal shape (Ax5E) have bond angles of 90, 180, or LESS THAN 90 and 180?

Jocelyn Sandoval 3B
Posts: 26
Joined: Wed Sep 21, 2016 2:59 pm

Re: Square Pyramidal

Postby Jocelyn Sandoval 3B » Wed Nov 02, 2016 2:50 pm

Well since there is a lone pair, it causes the bonds on the sides to push down making them less than 90 degrees.

Navi Sidhu 1F
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

Re: Square Pyramidal

Postby Navi Sidhu 1F » Wed Nov 02, 2016 2:56 pm

These (credible) websites suggest that it's 90/120 degree angles.

http://chem.libretexts.org/Core/Inorganic_Chemistry/Molecular_Geometry/Square_Pyramidal
http://butane.chem.uiuc.edu/pshapley/GenChem2/A1/3.html
http://homepage.smc.edu/scholefield_michelle/chem11/handouts/VSEPR%20Theory%20and%20the%20Shapes%20of%20Molecules.pdf

I personally wouldn't worry too much because on the practice midterms, Prof Lavelle sometimes puts "slightly less than 120" OR "120," to describe bonding angles in various shapes, indicating that either answer would get full credit. (See Q7 on page 189 and Q7 on page 207 in the course reader.) That said, you might want to check with a TA.


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