Polarity and electronegativity

(Polar molecules, Non-polar molecules, etc.)

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Angeline 3E
Posts: 50
Joined: Wed Sep 18, 2019 12:20 am

Polarity and electronegativity

Postby Angeline 3E » Mon Dec 02, 2019 7:45 pm

What's the correlation? How does the difference in electronegativity between two elements in a compound cause a molecule to be polar (even if its VESPR structure is symmetrical)?

Haley Dveirin 1E
Posts: 101
Joined: Sat Jul 20, 2019 12:17 am

Re: Polarity and electronegativity

Postby Haley Dveirin 1E » Mon Dec 02, 2019 7:46 pm

Because if one is more electronegative than the other it will cause there to be a partial negative where the more electronegative element is and a partial positive where the less electronegative element is.

Jamie Lee 1F
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

Re: Polarity and electronegativity

Postby Jamie Lee 1F » Mon Dec 02, 2019 7:50 pm

A polar bond forms when one atom has a greater attraction for electrons than do the other atoms, this pull of electrons is called electronegativity. So, the greater the electronegativity, the greater the polarity of the molecule.

In water, for example, oxygen has a greater pull on electrons than the hydrogen atoms do, so the dipole moment points towards the oxygen atom and creates a bent, polar molecule. However, in carbon dioxide, carbon and oxygen have relatively similar electronegativities, so the electrons are not pulled towards one atom or the other and are equally dispersed throughout the molecule.

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