bond angles

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

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Stefani Qonsul
Posts: 3
Joined: Fri Jun 17, 2016 11:28 am

bond angles

Postby Stefani Qonsul » Sun Jul 10, 2016 11:56 pm

How do you determine a bond angle? For example, on page 110 of the textbook, it provides the example of Beryllium chloride of having bond angles of 180, and the shape is linear. That makes sense to me, since the atoms are on opposite sides. However, a tetrahedral arrangement, as seen in Methane, has bond angles of 109.5. How is this determined?

noelbattle
Posts: 3
Joined: Fri Jun 17, 2016 11:28 am

Re: bond angles

Postby noelbattle » Mon Jul 11, 2016 9:04 am

Methane's molecular formula is CH4, so its hybridization is sp3, because there are 4 electron pairs. This hybridization correlates with the angles being separated by an angle of 190.5 degrees.

Chem_Mod
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Re: bond angles

Postby Chem_Mod » Mon Jul 11, 2016 9:53 am

The angles are determined by the molecular geometry. To obtain the bond angle, you would refer to one terminal atom - central atom - another terminal atom. So for your example, you would be considering H-C-H angle. The values for the bond angle arises from geometry.


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