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

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Postby daisyjimenezt » Fri Nov 23, 2018 2:35 pm

Can someone explain how to draw dipole moments and how do they determine polarity?

Beatrice Petelo 1F
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Re: Polarity

Postby Beatrice Petelo 1F » Fri Nov 23, 2018 3:00 pm

In polar molecules, dipoles do not cancel (e.g. CHCl3). The lewis structure of this molecule has one side that is more electronegative (Cl) than the other (H). An arrow would be drawn towards the more electronegative side -- Cl, indicating a dipole moment.

Samantha Pacheco 2K
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Re: Polarity

Postby Samantha Pacheco 2K » Fri Nov 23, 2018 4:23 pm

You can draw an arrow toward the partial negative end and if these partial negatives cancel the molecule will be nonpolar.

Cole Elsner 2J
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Re: Polarity

Postby Cole Elsner 2J » Fri Nov 23, 2018 4:42 pm

Dipole moments go towards the more electronegative element in a molecule. To determine polarity, consider the shape of the molecule itself. Take into account the arrows, where they're going, if they cancel out, or if they're different atoms. If everything cancels out, it's nonpolar, but if it's even slightly off it will be polar.

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Re: Polarity

Postby anishathomas » Fri Nov 23, 2018 4:54 pm

Dipole moments are basically when the atoms that are drawn have differences in electronegativity. If you want to see if a molecule is polar, look at the overall structure. Sometimes there could be polar bonds but the structure's dipole moments could cancel each other out, and therefore be nonpolar.

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Re: Polarity

Postby angelagd3l » Fri Nov 23, 2018 7:31 pm

are there any exceptions to this trait when drawing the structures?

Rylee Nelsen 3A
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Re: Polarity

Postby Rylee Nelsen 3A » Sat Nov 24, 2018 11:53 am

Dipole moments only occur in polar molecules when there is a difference in electronegativity. If you draw the arrows on the Lewis structure there will be a dipole moment when the arrows do not cancel out, meaning they are not pointing is opposite directions basically.

Zubair Ahmed 1L
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Re: Polarity

Postby Zubair Ahmed 1L » Sat Nov 24, 2018 12:50 pm

We typically indicate dipole moments by drawing an arrow towards the partial negative end of a molecule. If arrows cancel out, we know hat the molecule in non-polar.

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