i.e under which conditions.
2006-11-30 00:51:01 · 9 answers · asked by umang 1 in Science & Mathematics ➔ Chemistry
dude check out this link, hope it'll help
http://www.lsbu.ac.uk/water/hbond.html
2006-11-30 01:00:19 · answer #1 · answered by rohit k 3 · 0⤊ 0⤋
Do you mean Hydrogen bonding between water molecules...
When in a molecule, if the hydrogen atom in bonded to a highly electronegative atom, like, oxygen or nitrogen, then the electron of hydrogen is pulled more towards the electro-negative atom. So, the hydrogen gets positively charged and the other atom (O or N)negatively charged. Now, the positive H and the negative O of two different atoms attract each other, and stick close to each other. That is Hydrogen bonding.
The bottom line is, when the hydrogen atom is bonded to a highly electronegative atom, Hydrogen bonding takes place.
Did you know, water wouldn't be liquid if it weren't for Hydrogen bonding? It would have been a gas.
2006-11-30 09:01:59 · answer #2 · answered by Guess who? 2 · 0⤊ 0⤋
Hydrogen bonding occurs between molecules when the following conditions are met:
One molecule has an electronegative atom (usually oxygen, nitrogen, fluorine, chlorine)
This atom has a lone pair (unbonded)
The other molecule has a hydrogen on it
And this hydrogen is attached to an electronegative atom
E.g.
                             H
                              |Â
C—O—HÂ Â |Â |Â |Â |Â |Â :Â OÂ
|Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â |
OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â HÂ
(Pretend the ... are |)
Here the water on the right has the electronegative atom with the lone pair, which bonds (vertical lines) with the hydrogen on the acid, since it is connected to an electronegative atom (in this case also an oxygen). Electronegativity is required to make the hydrogen suitably delta-positive to attract the other electronegative atom on the other molecule (since an electronegative atom next to a hydrogen draws electrons away from it and makes it positively charged - delta positive).
2006-11-30 09:04:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
You have an hydrogen bound each time that an atom of hydrogen which I recall is very electropositive is near an atom very electronegative such as N , O, F nitrogen, oxygen ,fluorine
A striking example is water where each atom of oxygen forms two hydrogen bounds with 2 hydrogens from other molecules of water
The second is the DNA where there are two hydrogen bounds between AT pairs and 3 with GC pairs
2006-11-30 09:01:32 · answer #4 · answered by maussy 7 · 0⤊ 0⤋
nitrogen , oxygen, flourine are highly electronegetive elements. when they are attached to hydrogen atom to form covalent bond,the electrons of the covalent bond shifted towards the more electronegetive atom. this partially positively charged hydrogen atomforms a bond with other more electronegetive atom, this kind of bond is known as hydrogen bond which is very weaker than covalent bond.
2006-11-30 10:45:15 · answer #5 · answered by mee-cool 1 · 0⤊ 0⤋
when hiegher electronegative atom like oxygen, nitrogen and clorine present near to the hydrogen atom
2006-11-30 09:12:53 · answer #6 · answered by kishan k 1 · 0⤊ 0⤋
As soon as bond breaking takes place.
2006-11-30 08:59:36 · answer #7 · answered by vinisha v 2 · 0⤊ 0⤋
because in hydrogen bondind the angle batween hydrogen and other element is 104.2 .
2006-11-30 09:56:47 · answer #8 · answered by shahzad b 1 · 0⤊ 0⤋
when alpha hydrogen is present at adjecent carbon.
2006-11-30 09:07:29 · answer #9 · answered by Anonymous · 0⤊ 0⤋