How does NH3 have hydrogen bonding AND dipole-dipole bonding?

[GomerPyle]

How does NH3 exhibit both h-bonding and dipole-dipole? I thought the h-bonding was the same as dipole-dipole when NH3 intermolecular bonds with itself. The question asked if the intermolecular bonding is just h-bonding, dipole-dipole bonding, or both. The answer is both, but I can't distinguish between the two with this molecule since the H-bonding is in result of the electronegativity difference between H and N, which also produces the dipole?

Also, apparently london dispersion forces exist as well. I don't see it...I thought it would just be h-bonding. help?

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[FeinMS]

H bond is a special type of dipole dipole imo

 

[Jepstein30]

How does NH3 exhibit both h-bonding and dipole-dipole? I thought the h-bonding was the same as dipole-dipole when NH3 intermolecular bonds with itself. The question asked if the intermolecular bonding is just h-bonding, dipole-dipole bonding, or both. The answer is both, but I can't distinguish between the two with this molecule since the H-bonding is in result of the electronegativity difference between H and N, which also produces the dipole?

Also, apparently london dispersion forces exist as well. I don't see it...I thought it would just be h-bonding. help?

H-bonding IS dipole-dipole. The strongest type. Think what a dipole is.. dipole-dipole interactions mean interactions between positive and negative poles of two different molecules. In an H-bond, you have a partial positive H atom attracted to a partial negative O atom.

London dispersion forces ALWAYS exist. They are basically temporary (induced) dipole interactions.