Dipole moment

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

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Katie Frei 1L
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Dipole moment

Postby Katie Frei 1L » Tue Nov 27, 2018 5:40 pm

Why does CN2H2 have a dipole moment? When drawing the Lewis structure, it looks to be symmetrical when the arrows point toward the two nitrogens, so I'm confused why the molecule has a dipole moment. Thanks!

Neil Hsu 2A
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

Re: Dipole moment

Postby Neil Hsu 2A » Tue Nov 27, 2018 11:12 pm

If you look at the lewis structure of CN2H2, the carbon is triple bonded to one of the nitrogens on one side and single bonded to the other nitrogen on the other side. The single bonded nitrogen is bonded to the two hydrogens. There is a net dipole since the single bonded nitrogen attracts the electrons of the hydrogens (and carbon) to create a partial positive charge on the hydrogens. Additionally, the triple bonded nitrogen will attract the electrons from carbon to have a partial negative charge. Thus, having partial charges on opposite side, there is a dipole.

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