Shape and Polarity?  [ENDORSED]

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

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Michelle Wang 4I
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Joined: Fri Sep 28, 2018 12:27 am

Shape and Polarity?

Postby Michelle Wang 4I » Sun Nov 18, 2018 2:05 pm

Can someone explain again how the shape of a molecule can determine whether it is polar or non polar?

Chloe Qiao 4C
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Re: Shape and Polarity?  [ENDORSED]

Postby Chloe Qiao 4C » Sun Nov 18, 2018 2:12 pm

If a molecule has no dipole moments, it is nonpolar; if it has dipole moments but the dipole moments that cancel out, it is also nonpolar(for example, the two C-O bonds in CO2 are polar, but they are arrange exactly opposite to each other, so the dipole moments cancel out); if the molecule has dipole moments that do not cancel out, it is polar.

Olivia L 4E
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Re: Shape and Polarity?

Postby Olivia L 4E » Sun Nov 18, 2018 2:24 pm

In a molecule, the atoms surrounding the central atom have some degree of electronegativity (the "hogging" of electrons when sharing). This creates a dipole moment. If the shape doesn't allow the polarity (pull of the electrons and difference in charge) to cancel each other out, it will be a polar molecule.

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Re: Shape and Polarity?

Postby hazelyang2E » Sun Nov 18, 2018 4:03 pm

In addition to what has already been said in previous answers, the symmetry of a molecule's shape can indicate whether a molecule is polar or nonpolar. If atoms are arranged symmetrically around the central atom so that their dipole moments cancel each other out, then the molecule will be nonpolar. However, if the atoms are asymmetric, they will not cancel out and the molecule will be polar.

Nick Bazett 1F
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Joined: Fri Sep 28, 2018 12:15 am

Re: Shape and Polarity?

Postby Nick Bazett 1F » Sun Nov 18, 2018 4:30 pm

What is the definition of Dipole Moments?

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