Hydrogen bonds

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Neha Gupta 2A
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Hydrogen bonds

Postby Neha Gupta 2A » Sun Nov 15, 2020 1:32 pm

Why can't hydrogens attached to carbon form hydrogen bonds while hydrogens attached to N,O,F can?

Stuti Pradhan 2J
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Re: Hydrogen bonds

Postby Stuti Pradhan 2J » Sun Nov 15, 2020 1:57 pm

The difference in electronegativity between the hydrogen and the carbon is not enough to give the hydrogen a significant partial positive charge, so it is not attracted to the lone pair electrons on other oxygen, nitrogen, or fluorine atoms. Hydrogens attached to carbons mainly only have induced dipole -induced dipole interactions, unless the molecule is polar, in which case dipole dipole interactions may also occur.

Hope this helps!

Thomas Gimeno
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Re: Hydrogen bonds

Postby Thomas Gimeno » Sun Nov 15, 2020 9:36 pm

Carbon and hydrogen have very similar electronegativities so when they are bonded together it is non polar. This means that their is no partial charges and it is these partial charges that cause hydrogen bonding to occur.

Eve Gross-Sable 1B
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Re: Hydrogen bonds

Postby Eve Gross-Sable 1B » Sun Nov 15, 2020 9:38 pm

Their electronegativities are too similar. Because hydrogen bonds are formed from electron via a difference in electronegativity, it won't happen when a hydrogen and a carbon are near each other that level of pulling does not occur.

Caelin Brenninkmeijer 1G
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Re: Hydrogen bonds

Postby Caelin Brenninkmeijer 1G » Sun Nov 15, 2020 9:43 pm

Hydrogen bonding is a result of a hydrogen atom bonding to a very electronegative atom (F, N, O). Hydrogen would be unable to form a hydrogen bond with carbon because their electronegativity values are too close/similar.

Brian Nguyen 2I
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Re: Hydrogen bonds

Postby Brian Nguyen 2I » Sun Nov 22, 2020 5:17 pm

Carbon and hydrogen's electronegativity difference is too small compared to that of hydrogen with the elements nitrogen, oxygen, and fluorine. Thus, it can't form partial charges for hydrogen bonds to occur.

Mina Tadros 3L
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Re: Hydrogen bonds

Postby Mina Tadros 3L » Sun Nov 22, 2020 5:28 pm

Carbon and Hydrogen have similar electronegativities, and thus, have a small electronegativity difference. However, since Fluorine, Oxygen, and NItrogen are more electronegative than Carbon, there is a greater electronegativity difference. This is why hydrogen bonds are only present in bonds with Nitrogen, Fluorine, and Oxygen.

Lauren Strickland 1B
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Re: Hydrogen bonds

Postby Lauren Strickland 1B » Sun Nov 22, 2020 5:39 pm

It is because carbon and hydrogen have similar electronegativities. Fluorine, nitrogen, and oxygen are extremely electronegative so they can form hydrogen bonds.

Sean Phen
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Re: Hydrogen bonds

Postby Sean Phen » Sun Nov 22, 2020 7:19 pm

N,O, F have high electronegativities, and hydrogen has to bond with elements with high electronegativities. Carbon is not one of them.

Yuehan_Wu_3K
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Re: Hydrogen bonds

Postby Yuehan_Wu_3K » Sun Nov 22, 2020 7:30 pm

Because the difference of electronegativity between hydrogen and carbon is much smaller than that between hydrogen and N,O,F

Brian_Wu_3B
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Re: Hydrogen bonds

Postby Brian_Wu_3B » Sun Nov 29, 2020 2:38 pm

It's the difference in electronegativity. The difference between C and H aren't great enough to cause hydrogen bonding.

Simran Bains 2C
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Re: Hydrogen bonds

Postby Simran Bains 2C » Sun Nov 29, 2020 3:03 pm

It is due to the electronegativity of the carbon and hydrogen being very similar.

IshanModiDis2L
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Re: Hydrogen bonds

Postby IshanModiDis2L » Sun Nov 29, 2020 3:37 pm

Hydrogen bonding is a consequence of a hydrogen atom bonding to a very electronegative atom specifically F, N, O. Hydrogen is able to form a hydrogen bond with these atoms because the difference in electronegativity is large enough unlike it is with carbon. The small difference between the hydrogen and the carbon is not enough to give the hydrogen a significant partial positive charge, so it is not attracted to the lone pair electrons.

Ethan Goode 2H
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Re: Hydrogen bonds

Postby Ethan Goode 2H » Sun Nov 29, 2020 3:47 pm

N,O, and F are much more electronegative than Carbon, meaning when they are bonded to the hydrogen there is less of a dipole moment since the carbon is not as electronegative, therefore not allowing hydrogen bonds to form.

Zainab Jamali 1H
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Re: Hydrogen bonds

Postby Zainab Jamali 1H » Sun Nov 29, 2020 4:46 pm

The hydrogen bond relies partially on a partial positive charge on the hydrogen. When the H is attached to a carbon, there is very little polarity and the partial charge on hydrogen isn't there to bond to the partial negative on the bonding atom.

tholz11
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Re: Hydrogen bonds

Postby tholz11 » Sun Nov 29, 2020 5:14 pm

Hydrogen and Carbon's electronegativities are too similar to create the polarity needed for Hydrogen bonds to form.

Kat Stahl 2K
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Re: Hydrogen bonds

Postby Kat Stahl 2K » Sun Nov 29, 2020 5:35 pm

It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom. Carbon is not electronegative enough to form a hydrogen bond.

Michael Cardenas 3B
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Re: Hydrogen bonds

Postby Michael Cardenas 3B » Sun Nov 29, 2020 11:22 pm

Are N, O, and F the only atoms that hydrogen bonds can occur with or can they also occur with other electronegative atoms?

Kaiya_PT_1H
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Re: Hydrogen bonds

Postby Kaiya_PT_1H » Sun Dec 06, 2020 8:45 pm

Michael Cardenas 1A wrote:Are N, O, and F the only atoms that hydrogen bonds can occur with or can they also occur with other electronegative atoms?


just N,O, and F since they are the most highly electronegative!

Michael Cardenas 3B
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Re: Hydrogen bonds

Postby Michael Cardenas 3B » Sun Dec 06, 2020 9:55 pm

Ok thank you!!


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