Why are intermolecular HCl molecules among them not considered hydrogen bonds?

In summary, a hydrogen bond is formed between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This applies to hydrochloric acid, but due to the large size of the chlorine atom, the dipole-dipole force between hydrogen and chlorine is not as strong as with smaller atoms like nitrogen, oxygen, or fluorine. This information is from Wikipedia and is relevant for studying general chemistry.
  • #1
kashiark
210
0
A hydrogen bond is the attractive force between one electronegative atom and a hydrogen covalently bonded to another electronegative atom. Doesn't this apply to hydrochloric acid?
 
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  • #2
http://en.wikipedia.org/wiki/Hydrogen_bond
It results from a dipole-dipole force with a hydrogen atom bonded to nitrogen, oxygen or fluorine.

Studying general chemistry? That statement was from wiki so basically, it's got to involve one of those elements.
 
  • #3
Youd expect it to because Cl is pretty electronegative, but chlorine is also a very large molecule, so it basically can't get close enough to the hydrogens to cause any particularly strong dipole, and the hydrogen has a high charge density so it deformes the large Cl into a fairly covelant bond.
 

1. Why are intermolecular HCl molecules not considered hydrogen bonds?

Hydrogen bonds occur between a hydrogen atom and a highly electronegative atom, such as nitrogen, oxygen, or fluorine. In HCl molecules, the hydrogen atom is bonded to the chlorine atom, which is less electronegative than the other atoms commonly involved in hydrogen bonding. Therefore, the bond between H and Cl is not strong enough to be considered a hydrogen bond.

2. What is the difference between a hydrogen bond and a dipole-dipole interaction?

A hydrogen bond is a specific type of dipole-dipole interaction that occurs between a hydrogen atom and a highly electronegative atom. It is a stronger bond than a regular dipole-dipole interaction because of the large difference in electronegativity between the two atoms involved.

3. Can hydrogen bonding occur between two HCl molecules?

No, hydrogen bonding only occurs between a hydrogen atom and a highly electronegative atom, such as nitrogen, oxygen, or fluorine. In HCl molecules, both atoms (H and Cl) are not highly electronegative, so hydrogen bonding cannot occur.

4. Why is hydrogen bonding important in biological systems?

Hydrogen bonding plays a crucial role in many biological processes, such as DNA replication and protein folding. These bonds are responsible for the specific three-dimensional structures of molecules, which are essential for their function. Hydrogen bonding also contributes to the unique properties of water, which is the main component of living organisms.

5. How does the strength of a hydrogen bond compare to other types of chemical bonds?

Hydrogen bonds are weaker than covalent and ionic bonds, but stronger than regular dipole-dipole interactions. The strength of a hydrogen bond depends on the electronegativity of the atoms involved and the distance between them. In general, these bonds are stronger than most other intermolecular forces, but they are still much weaker than intramolecular bonds.

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