Determining Polarity

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sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

Determining Polarity

Postby sarahsalama2E » Thu Nov 21, 2019 11:59 am

Is CH2I2 polar or nonpolar?

Vicki Liu 2L
Posts: 101
Joined: Sat Aug 24, 2019 12:15 am

Re: Determining Polarity

Postby Vicki Liu 2L » Thu Nov 21, 2019 1:36 pm

To determine this, start by drawing the Lewis structure. When you do so, you’ll see that the central carbon atom has 4 bonding regions. Using VSEPR, this molecule would have a tetrahedral shape. Even though tetrahedral is a symmetrical molecular shape, drawing out the dipole moments (from partial positive C atom to partial negative I atoms) shows that the dipoles do not cancel, thus making CH2I2 polar.

William Francis 2E
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: Determining Polarity

Postby William Francis 2E » Thu Nov 21, 2019 1:38 pm

I believe that this molecule would be nonpolar since carbon, hydrogen, and iodine all have very similar electronegativities. Carbon and iodine have electronegativites of 2.5 and hydrogen has an electronegativity of 2.1. There isn't substantial enough electronegativity difference between atoms to result in a polar molecule.

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

Re: Determining Polarity

Postby Haley Chun 4H » Thu Nov 21, 2019 3:08 pm

With a tetrahedral shape, the molecule cannot be nonpolar unless all four attached atoms are the same (CH4). Thus, it will be polar.

Nan_Guan_1L
Posts: 92
Joined: Wed Sep 30, 2020 9:59 pm

Re: Determining Polarity

Postby Nan_Guan_1L » Sat Oct 17, 2020 7:20 am

this molecular is nonpolar. because C H I have similar electronegativity and the structure of the molecule is tetrahedral. tetrahedral molecules can "cancel out" the bonds because of it being symmetrical.


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