Saplong 15

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Ayesha Aslam-Mir 3C
Posts: 118
Joined: Wed Sep 30, 2020 9:43 pm

Saplong 15

Postby Ayesha Aslam-Mir 3C » Sun Nov 15, 2020 11:16 pm

On Sapling Question 15, why is HF the only compound listed (hydrogen halide) thta remains covalently bonded in water of HF, HBr, HCl, and HI?

Rohit Srinivas 2D
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Joined: Wed Sep 30, 2020 9:52 pm

Re: Saplong 15

Postby Rohit Srinivas 2D » Sun Nov 15, 2020 11:18 pm

I believe the question is asking which one of the molecules has hydrogen bonding in water. (these are the atoms with H bound to F, O, or N) HF is the only molecule that meets this criteria

Sera Aintablian 2E
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Re: Saplong 15

Postby Sera Aintablian 2E » Sun Nov 15, 2020 11:19 pm

HF is the only covalent bond within that list capable of Hydrogen bonding. Remember, the three elements that can bond with Hydrogen are Nitrogen, Oxygen, and Fluorine.

Fernanda Olvera 3D
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Re: Saplong 15

Postby Fernanda Olvera 3D » Sun Nov 15, 2020 11:24 pm

I agree with Sera, just remember F, O, N.

Ven Chavez 2K
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Joined: Mon Feb 24, 2020 12:16 am

Re: Saplong 15

Postby Ven Chavez 2K » Sun Nov 15, 2020 11:30 pm

For the question it is only necessary to acknowledge that HF is the only one that can form hydrogen bonds since hydrogen bonds can only be made between N, O, and F. But I believe it might be that HF has the most polar covalent properties among the hydrogen halides. This is because electronegativity decreases as you go down a group. Therefore the electrons would attract closer to F than any other in the group causing more polarity.

AntonioZarich2E
Posts: 41
Joined: Wed Sep 30, 2020 9:43 pm

Re: Saplong 15

Postby AntonioZarich2E » Sun Nov 15, 2020 11:31 pm

It has to be HF because F is the only element out of the options that can bond with hydrogen.

sabrina ghalambor 2J
Posts: 105
Joined: Wed Sep 30, 2020 9:35 pm

Re: Saplong 15

Postby sabrina ghalambor 2J » Sun Nov 15, 2020 11:33 pm

everyone has stated why its HF above, but I think it's also important to remember that the bond lengths between H and other molecules in group 17 increase as you go down!


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