sapling question 7 (homework week 7/8)

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Lusin_Yengibaryan_3B
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sapling question 7 (homework week 7/8)

Postby Lusin_Yengibaryan_3B » Tue Nov 17, 2020 10:02 pm

Which of these molecules are polar?

CH2Cl2

SO2

CO2

PCl3

How do we figure out which molecule is polar if we're given the lewis structures?

Tikva Cohen 1K
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Re: sapling question 7 (homework week 7/8)

Postby Tikva Cohen 1K » Tue Nov 17, 2020 10:07 pm

usually it's by looking at the electronegativity of each elements. whichever is more electronegative will pull towards itself, and then you draw the vectors accordingly. then add them to see which direction they go in. if they all cancel out, it would be nonpolar, if they don't cancel, it's polar

Tikva Cohen 1K
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Re: sapling question 7 (homework week 7/8)

Postby Tikva Cohen 1K » Tue Nov 17, 2020 10:08 pm

oh also if its a diatomic molecule like in this case CL2 it's always nonpolar because they both pull the same amount in opposite directions and the vectors cancel

Sera Aintablian 2E
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Re: sapling question 7 (homework week 7/8)

Postby Sera Aintablian 2E » Mon Nov 30, 2020 1:33 am

First, consider the electronegativity differences between the atoms. Then, consider if all of the atoms are the same that are bonding with the central atom. If they are, then they cancel out, therefore a nonpolar molecule with polar bonds. Diatomic molecules pull on each other and are generally nonpolar. Polar molecules are those in which dipole moments do not cancel out. Polar molecules may sometimes also be indicated if the central atom has a lone pair.

Pranav Daggubati 3C
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Re: sapling question 7 (homework week 7/8)

Postby Pranav Daggubati 3C » Mon Nov 30, 2020 9:34 am

It usually depends on the 3d shape and the electronegativity of the atoms that comprise the molecule. if the electronegativities are imbalanced in 3 dimensions, then the molecule is polar. Else, it is nonpolar.


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