Dipole - Dipole vs. Hydrogen Bonding

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505095972
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Joined: Fri Sep 28, 2018 12:17 am

Dipole - Dipole vs. Hydrogen Bonding

Postby 505095972 » Thu Nov 08, 2018 10:46 pm

In High School, I thought we learned the hydrogen bonding was the weakest form of bonding, but my notes show that Dipole-Dipole bonds are actually weaker. Why is that?

Meghanhe1l
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Joined: Fri Sep 28, 2018 12:17 am

Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Meghanhe1l » Thu Nov 08, 2018 10:56 pm

Hydrogen bonds are a special type of dipole-dipole bonds where hydrogen is bonded to O, N, or F. These are three very electronegative atoms, so they have greater polarizing power, and thus a stronger dipole and a stronger bond than other dipole-dipole bonds.

Sarah Zhao 4C
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Joined: Fri Sep 28, 2018 12:28 am

Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Sarah Zhao 4C » Thu Nov 08, 2018 10:57 pm

So yes, H-bonds are the weakest types of bonds. Key word here being BONDS. So it's being compared to stronger covalent bonds and even stronger ionic bonds.

Dipole-dipole is an inter molecular force!

Hannah Yates 1K
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Joined: Fri Sep 28, 2018 12:27 am

Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Hannah Yates 1K » Fri Nov 09, 2018 3:30 pm

H-Bonding isn’t actually a type of bond. A lot of people get this confused because of the word bonding in it. H-Bonding is another type of Intermolecular force (or interaction). Compared to Ionic and Covalent bonds, H-bonding is very weak, but it is definitely stronger than Dipole-Dipole.

Jaedyn_Birchmier3F
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Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Jaedyn_Birchmier3F » Sun Nov 11, 2018 5:02 pm

Dipole- Dipole interactions are weaker than hydrogen bonding because dipoles don't create a bond at all, it is more of a moment. Dipole- Dipole interactions are based on something called Van Der Waals forces which are much weaker than hydrogen bonds. These forces occur when there is a moment in which the space in which the electrons are become attracted to another atom in the space in which the electrons aren't found. Therefore a partial moment negative charge is attracted to a partial moment positive charge. Since this isn't a bond it would therefore be much less attractive than a hydrogen bond in which the partial charges are not just a moment.

TYun_1C
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Re: Dipole - Dipole vs. Hydrogen Bonding

Postby TYun_1C » Fri Nov 08, 2019 6:15 pm

Another things that helps is knowing that carbon is “happy” with 4 bonds, nitrogen with 3, oxygen with 2 and fluorine with 1. Meaning that when these elements have these number of bonds, they have a formal charge of zero.

Sanjana K - 2F
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Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Sanjana K - 2F » Fri Nov 08, 2019 7:03 pm

N,O, and F tend to bond with H in a hydrogen bond and since they're more electronegative, they'll result in a higher polarity with the positive hydrogen so the bond will also be stronger than a normal dipole-dipole.

Sally Qiu 2E
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: Dipole - Dipole vs. Hydrogen Bonding

Postby Sally Qiu 2E » Fri Nov 08, 2019 7:26 pm

h bonding is an intermolecular force, so attraction between molecules. it is the stronger than dipole-dipole, which is also an intermolecular force. h bonding is weaker than covalent or ionic bonds though.


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