TEST 2 POLAR molecule

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JustinHorriat_4f
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

TEST 2 POLAR molecule

Postby JustinHorriat_4f » Sun Dec 01, 2019 11:31 pm

Why is the molecule that shows the lewis structure of CCl2H2 a polar molecule, I thought that the Cl atoms are pulling different ways so it makes the overall molecule non polar? I think the question number was 6.

Julie_Reyes1B
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: TEST 2 POLAR molecule

Postby Julie_Reyes1B » Sun Dec 01, 2019 11:34 pm

Because the molecule was tetrahedral, in the 3d space the polarities would not cancel each other out. The only time a tetrahedral molecule is nonpolar is when the outer atoms are all the same. The textbook has good 3d pictures to show why they would not cancel out.

Daniel Yu 1E
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Joined: Sat Aug 24, 2019 12:15 am

Re: TEST 2 POLAR molecule

Postby Daniel Yu 1E » Tue Dec 03, 2019 11:12 am

If you were to draw the CCl2H2 as a tetrahedral, you would see that the Chlorines were not opposite of each other, meaning their dipole moments wouldn't cancel. Remember the bond angles that we learned for tetrahedrals.

Subashni Rajiv 1K
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Joined: Wed Sep 18, 2019 12:16 am

Re: TEST 2 POLAR molecule

Postby Subashni Rajiv 1K » Tue Dec 03, 2019 11:18 am

The lewis structure can actually be drawn with the Chlorine atoms across from each other. Although symmetrical, because not all atoms surrounding the central atom are the same, it is a polar molecule.

Jack Riley 4f
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Joined: Sat Aug 24, 2019 12:17 am

Re: TEST 2 POLAR molecule

Postby Jack Riley 4f » Tue Dec 03, 2019 11:18 am

It is a tetrahedral molecule, so the dipoles only cancel out when all 4 atoms are the same.

Michelle Le 1J
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Joined: Fri Aug 09, 2019 12:16 am

Re: TEST 2 POLAR molecule

Postby Michelle Le 1J » Tue Dec 03, 2019 11:29 am

Since it's a tetrahedral molecule and all atoms attached to the central atom are different, they all have different strengths on their pull towards itself, so that is why Cl atoms don't cancel out.

Adelpha Chan 1B
Posts: 58
Joined: Thu Jul 25, 2019 12:15 am

Re: TEST 2 POLAR molecule

Postby Adelpha Chan 1B » Tue Dec 03, 2019 12:02 pm

JustinHorriat_3b wrote:Why is the molecule that shows the lewis structure of CCl2H2 a polar molecule, I thought that the Cl atoms are pulling different ways so it makes the overall molecule non polar? I think the question number was 6.


As the molecule is tetrahedral, it is only non polar if all four bonds are pulling equally. For example, CCl4 or CH4 would be nonpolar


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