Dipole Moment in a Lewis Structure

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Jason Slater 3I
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Joined: Wed Sep 21, 2016 2:58 pm

Dipole Moment in a Lewis Structure

Postby Jason Slater 3I » Mon Oct 24, 2016 12:02 pm

Can someone explain why we draw an arrow to represent the dipole moment in a lewis structure? What does it tell us?

Chem_Mod
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Re: Dipole Moment in a Lewis Structure

Postby Chem_Mod » Mon Oct 24, 2016 12:04 pm

The arrow points to the delta negative pole in the molecule, the tail of the arrow indicates the delta positive pole of the molecule.

Katherine_Zhuo_3B
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Re: Dipole Moment in a Lewis Structure

Postby Katherine_Zhuo_3B » Tue Oct 25, 2016 10:30 am

With the arrow showing us the delta positive pole and delta negative pole, we can determine which atom in the molecule has a higher electronegativity than the other, and will pull the shared electrons closer when sharing.

William Shu 1G
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Re: Dipole Moment in a Lewis Structure

Postby William Shu 1G » Thu Oct 27, 2016 8:27 pm

Is it just a matter of determining which atom has a higher electronegativity, and then drawing the dipole moment from there?

Alexandra Watts 3L
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Re: Dipole Moment in a Lewis Structure

Postby Alexandra Watts 3L » Fri Oct 28, 2016 1:25 am

How do we know which is negative and which is positive?

Noor_Chahal_3G
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Joined: Wed Sep 21, 2016 2:56 pm

Re: Dipole Moment in a Lewis Structure

Postby Noor_Chahal_3G » Fri Oct 28, 2016 1:34 am

The delta negative pole is the atom that is higher in electronegativity.

The delta positive pole is the atom that is lower in electronegativity.

For example in H2O, oxygen is more electronegative than hydrogen, so oxygen would be delta negative. The 2 hydrogens have a lower electronegativity, so they would be delta positive.


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