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My Chemistry Tutor > Ask Chemistry Homework Questions > College Chemistry > permanent dipole

permanent dipole

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Author Topic: permanent dipole  (Read 480 times)
jfontana
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Posts: 4
« on: May 06, 2008, 02:14:17 PM »
How can I tell which of the following have a permanent dipole but NO Hydrogen bonds?
CH4,  CH3-,  CH3-Br,  NaCl

I think I have eliminated the first 2, but not 100% sure. Thanks
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Chemistry_Guru
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« Reply #1 on: May 06, 2008, 02:34:40 PM »
 1
Permanent dipoles occurs when two atoms in a molecule have substantially different electronegativity - one atom attracts electrons more thyan another becoming negative, while the other atom becomes more positive.
whereas hydrogen bond is a type of force that exists between an electronegative atom and hydrogen atom bonded to another electronegative atom ( nitrogen, oxygen or flurine). This type of force involves hydrogen atom.
I hope that helps.

hey
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