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Author Topic: bond angles  (Read 5122 times)

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pele

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bond angles
« on: January 29, 2007, 08:30:50 AM »

Please help me with bond angles in molecule of SOCl2 !!! What angles approximately are there in molecule and how can I know that?

P.S sorry about my English
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Yggdrasil

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Re: bond angles
« Reply #1 on: January 29, 2007, 08:34:02 AM »

The first step is to draw a lewis structure of SOCl2
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pele

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Re: bond angles
« Reply #2 on: January 29, 2007, 08:49:01 AM »

Ok.I think I managed to draw it, but  I still don't have no idea about angles.
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english

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Re: bond angles
« Reply #3 on: January 29, 2007, 09:37:14 AM »

What molecular geometry can you infer from the VSEPR model?
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pele

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Re: bond angles
« Reply #4 on: January 29, 2007, 10:00:13 AM »

I don't know. I tried to use isis/draw and search google, but no results ??? >:(
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english

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Re: bond angles
« Reply #5 on: January 29, 2007, 10:12:35 AM »

I don't know. I tried to use isis/draw and search google, but no results ??? >:(

http://en.wikipedia.org/wiki/VSEPR.
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Yggdrasil

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Re: bond angles
« Reply #6 on: January 29, 2007, 12:56:34 PM »

What does your lewis structure look like?  What is the central atom?  How many atoms are bonded to the central atom?  How many lone pairs are on the central atom?
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pele

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Re: bond angles
« Reply #7 on: January 30, 2007, 02:06:38 AM »

the central atom is "S" 3 atoms are bonded to it. (one is double bond with "O")
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GreenHorn

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Re: bond angles
« Reply #8 on: January 30, 2007, 02:54:08 AM »

Well if there are 4 pairs of electrons (2 pairs on the double bond and 2 to the two chlorides)  the coordination number is 4, and thus the bond angle is 109 degrees? Correct me if im wrong...
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Yggdrasil

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Re: bond angles
« Reply #9 on: January 30, 2007, 08:03:55 AM »

the central atom is "S" 3 atoms are bonded to it. (one is double bond with "O")

Are there any lone pairs?
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pele

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Re: bond angles
« Reply #10 on: January 31, 2007, 07:53:00 AM »

If I understood correctly, than "S" has  2 alone electrons in the 3p orbital.
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Yggdrasil

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Re: bond angles
« Reply #11 on: January 31, 2007, 09:11:35 PM »

In SOCl2 there is a lone pair (although it is not in a 3p orbital, remember that atomic orbitals become hybridized when atoms are bonded to each other).  So, there are three atoms bonded to the sulfur and a lone pair.  This defines four "electron domains" (called steric number on the wikipedia site) which means that there will be a tetrahedral geometry about the sulfur.  Since three of the four electron domains are bonds, this leads to a trigonal pyramidal shape.

For more descriptions of how geometries of molecules relates to the number of "electron domains" and number of bonds v. lone pairs, see the chart at http://en.wikipedia.org/wiki/VSEPR
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