2E. 25a

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Haley Chun 4H
Posts: 54
Joined: Sat Aug 17, 2019 12:18 am

2E. 25a

Postby Haley Chun 4H » Sat Nov 16, 2019 7:15 pm

Why is CH2CL2 polar when the shape is symmetrical and there are two dipoles pointing towards Cl. Shouldn't they cancel?

ThomasNguyen_Dis1H
Posts: 81
Joined: Fri Aug 30, 2019 12:17 am

Re: 2E. 25a

Postby ThomasNguyen_Dis1H » Sat Nov 16, 2019 7:45 pm

CH2CL2 has the molecular shape of a tetrahedral. Due to the nature of a tetrahedral, the Cl atoms will be right next to each other. You can imagine a tripod with another leg above it. No matter how you rotate this shape, Cl will be right next to another Cl. Since the dipole moments move towards both Cl, there will be no cancellation and it will be a polar molecule. Lewis structures can be deceiving so always think of molecular shape.

Aliya Jain 2B
Posts: 80
Joined: Wed Sep 11, 2019 12:16 am

Re: 2E. 25a

Postby Aliya Jain 2B » Sun Nov 17, 2019 3:59 pm

Also, I think since the hydrogen atom is less electronegative than chlorine atom, there is a net dipole moment in the compound.


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