Dipole Moments

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Kassandra Molina 2B
Posts: 43
Joined: Wed Nov 16, 2016 3:03 am

Dipole Moments

Postby Kassandra Molina 2B » Wed Nov 22, 2017 2:34 am

How can you determine which element will affect dipole moments? Or is it depending on the compound? In other words, is determining dipole moments dependent on what the element is in a compound or the structure of a compound? I'm having a hard time grasping dipole moments.

Rita Dang 3D
Posts: 31
Joined: Fri Sep 29, 2017 7:07 am

Re: Dipole Moments

Postby Rita Dang 3D » Wed Nov 22, 2017 9:59 am

I think dipole moments depend on the electronegativity of each element and also the structure of the compound. By looking at the structure of a compound and determining its shape, we can decide whether the dipole moments cancel each other or not. In other words, we need to know the lewis structure and molecular shape before we determine dipole moments.

Austin Ho 1E
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Joined: Fri Sep 29, 2017 7:04 am
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Re: Dipole Moments

Postby Austin Ho 1E » Wed Nov 22, 2017 10:18 am

What Rita said is correct. The difference in electronegativities are more important than the values of electronegativity themselves. Also, you need to understand molecular shape to understand dipole moments: look at how 'balanced' the differences in electronegativity are. For example, in CCl4, the tetrahedral shape means that all the dipole moments of the C-Cl bonds cancel. However, if you add a H instead of a Cl, you get CHCl3, and the dipole moments no longer cancel.

Look at the difference in electronegativites rather than individual atoms.

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