Why and how does the molecule HF have hydrogen bonding

Watch this thread
youreanutter
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 6 years ago
#1
it says in the textbook HF has hydrogen boning but surely it doesnt as its a lone molecule?
ocr a chemistry a level
0
reply
pineneedles
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 6 years ago
#2
(Original post by youreanutter)
it says in the textbook HF has hydrogen boning but surely it doesnt as its a lone molecule?
ocr a chemistry a level
Hydrogen bonds are intermolecular forces. The electronegativity of the fluorine atom draws the electrons in the covalent bond toward it, creating a slightly negative charge on the fluorine atom and a slightly positive charge on the hydrogen atom. Opposite charges on molecules attract. E.g, a slightly positive hydrogen of one molecule of HF will be attracted to the fluorine side of another molecule of HF. Its this attraction which is considered the hydrogen 'bond'.
1
reply
youreanutter
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report Thread starter 6 years ago
#3
(Original post by pineneedles)
Hydrogen bonds are intermolecular forces. The electronegativity of the fluorine atom draws the electrons in the covalent bond toward it, creating a slightly negative charge on the fluorine atom and a slightly positive charge on the hydrogen atom. Opposite charges on molecules attract. E.g, a slightly positive hydrogen of one molecule of HF will be attracted to the fluorine side of another molecule of HF. Its this attraction which is considered the hydrogen 'bond'.
it states that hydrogen bonding is the intermolecular bonding between molecules containing N O or F and the H atom of -NH -OH or -HF
doesnt this mean thaty for it to be a hydrogen bond isnt it between a hrogen of one molecule and the O/N/F of a molecule with OH NH or HF?
0
reply
pineneedles
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 6 years ago
#4
Image
(Original post by youreanutter)
it states that hydrogen bonding is the intermolecular bonding between molecules containing N O or F and the H atom of -NH -OH or -HF
doesnt this mean thaty for it to be a hydrogen bond isnt it between a hrogen of one molecule and the O/N/F of a molecule with OH NH or HF?
Yes, that's what I've explained. This diagram may help you visualise it.
0
reply
pinkfloydfan
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report 6 years ago
#5
(Original post by pineneedles)
Hydrogen bonds are intermolecular forces. The electronegativity of the fluorine atom draws the electrons in the covalent bond toward it, creating a slightly negative charge on the fluorine atom and a slightly positive charge on the hydrogen atom. Opposite charges on molecules attract. E.g, a slightly positive hydrogen of one molecule of HF will be attracted to the fluorine side of another molecule of HF. Its this attraction which is considered the hydrogen 'bond'.
precisely. Fluorine is also the most electronegative element there is, hence there are greater intermolecular forces between HF molecules than say HCl molecules.
0
reply
youreanutter
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report Thread starter 6 years ago
#6
(Original post by pinkfloydfan)
precisely. Fluorine is also the most electronegative element there is, hence there are greater intermolecular forces between HF molecules than say HCl molecules.
but in a HF molecule i thought theres no hydrogen bonds as they are itramolecular forces?
1
reply
pineneedles
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#7
Report 6 years ago
#7
(Original post by youreanutter)
but in a HF molecule i thought theres no hydrogen bonds as they are itramolecular forces?
There aren't hydrogen bonds in, or within, a molecule of HF, there are hydrogen bonds between molecules of HF.
0
reply
Absent Agent
Badges: 21
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#8
Report 6 years ago
#8
(Original post by pineneedles)
There aren't hydrogen bonds in, or within, a molecule of HF, there are hydrogen bonds between molecules of HF.
I think the original poster was confused with the word "bonding" when considering hydrogen bonding as an intermolecular force.
0
reply
pineneedles
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#9
Report 6 years ago
#9
(Original post by Mehrdad jafari)
I think the original poster was confused with the word "bonding" when considering hydrogen bonding as an intermolecular force.
Yeah, I tried to explain that in my original post, but they still seemed confused.
0
reply
Absent Agent
Badges: 21
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#10
Report 6 years ago
#10
(Original post by pineneedles)
Yeah, I tried to explain that in my original post, but they still seemed confused.
Yeah, true! My bad. The fact that Hydrogen bonding is considered as an intermolecular force can be confusing
0
reply
pineneedles
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#11
Report 6 years ago
#11
(Original post by Mehrdad jafari)
Yeah, true! My bad. The fact that Hydrogen bonding is considered as an intermolecular force can be confusing
It's all good It can be! I was confused at the beginning, too.
0
reply
Trina28
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#12
Report 2 years ago
#12
How many h bond present in HF molecule?
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Year 12s - where are you at with making decisions about university?

I’ve chosen my course and my university (12)
31.58%
I’ve chosen my course and shortlisted some universities (13)
34.21%
I’ve chosen my course, but not any universities (2)
5.26%
I’ve chosen my university, but not my course (2)
5.26%
I’ve shortlisted some universities, but not my course (2)
5.26%
I’m starting to consider my university options (6)
15.79%
I haven’t started thinking about university yet (0)
0%
I’m not planning on going to university (1)
2.63%

Watched Threads

View All