Why is Hydrogen Bonding the strongest?
- 1 decade agoFavorite Answer
ok ok....their are two types of H-bonding! Know this, dont get confused:
Their is a type of Hydrogen bond that lands in the Van Der Waals forces category, its called London Dispersion, where an H and and H get together. The energy of that bond is 0.4-1.3 kj/mol. By the way you dont call this H-bonding you call this Van Der waals forces.
Now, their is The Hydrogen Bond. Its an electrostatic interaction between a stong electronegative atom and a Hydrogen. Their are 3 types of electronegative atoms that fall under Hydrogen Bonding: N,O, and i cant remember the third..haha Hydrogen bonding has a energy bond of 8 - 25 kj/mol which is stronger than van der waals. Example of H-bonding H2O with another H2O. The O of one water, makes a H bond with an H of the other water.
and Hydrogen bond is not the strongest....its covalent bond at 209 kj/mol
wait wait...and Sulfur (S) the third atom!Source(s): ucla :)
- 1 decade ago
From what I know, the 3 atoms are actually N, O, F (wiki also states so)
when H is bonded with N/O/F, e.g. H2O, NH3, HF, the intermolecular forces of attraction for these molecules are hydrogen bonding.
H bonds is formed between H of one molecule with the lone pair of electrons from another molecule's N/O/F
N, O and F are the more electronegative elements in the periodic table, thus they are able to pull the electrons involved in intramolecular bonds towards them forming molecules with high dipole moment.
Hence, the partial positive charged end of these molecules is greater than those in usual polar molecules (which have permanent dipole-permanent dipole forces of attraction that is generally weaker than H bonds). Since the strength of these attraction is dependent on the attraction between the partial positive and partial negative ends of two molecules, the stronger the charge, the stronger the attraction which is why hydrogen bonding is strongest amongst van der Waals forces of attraction.
Induced dipole-induced dipole forces of attraction is also one of it. It is the weakest as this attraction exist only between non-polar molecules where the partial charges exist momentarily. Electrons in the molecule moves randomly and in some occasion they concentrate more on one side of the molecule resulting in partial negative and positive charges in the molecule. However, the next moment they might shift again. Hence, the attraction is not stable and strong.
Hydrogen bond is GENERALLY the strongest. However, there are other factors such as the size of the molecule, the bigger it is the stronger the attraction. Hence, it is possible for a very large polar molecule with no H bonds to have stronger attraction between them than a small molecule with H bonds.
Also, covalent, ionic and metallic bonds are actually even much more stronger than hydrogen bonds. The conclusion that hydrogn bonding is the strongest applies only when compared to other van der Waals' forces of attraction GENERALLY.Source(s): Memory work - don't trust it word for word, consult chem books/teachers
- 1 decade ago
The Hydrogen bond is the strong electrostatic force of attraction of attraction in between the strong electro negative atom and the H atom.
In general the H bond formed in between H and 3 atoms:N,O and S.
This H bonding is either by inter molecular i.e inbetween the molecules like the H-bond in water molecules and it may be intra molecular i.e with in the molecule like the H- bond in between the Salicylic Acid. But the H bonding is not so stronger than Covalent bond.
- poynterLv 44 years ago
ionic and covalent are reliable bonds, yet they're seen intramolecular bonding forces. intermolecular forces comprise london forces, dipole-dipole, and hydrogen bonding (in fact, those are truly all merely countless strengths of a similar repeating topic: beneficial love negatives) hydrogen bonding is the choicest of those intermolecular bonding forces. the ingredient that separates inter from intramolecular bonds is that intermolecular bonds are fleeting and purely style in passing or if the molecules are locked in place by another tension. they do no longer seem to be reliable sufficient to hold 2 atoms at the same time on their own (however in case you stack sufficient hydrogen bonding forces at the same time, they are able to hold a 2 molecules at the same time. see: DNA) hydrogen bonding happens once you have a in part beneficial atoms (generally oxygen, nitrogen, or sulfur) that has a unfastened pair of electrons that this is able to donate. whilst those unfastened electrons see a in part beneficial hydrogen (generally discovered ON a oxygens, nitrogens, or sulfurs), they are able to style a vulnerable interaction of beneficial and unfavourable allure. im uncertain why hydrogen bonding is the choicest of the forces, yet i will assure you that the respond is decently complicated and steeped in mathematical reasoning.
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- 1 decade ago
its not, its one of the weakest...