Compound forms hydrogen bonds

Answer 1

Hydrogen bonds are formed between compounds containing a hydrogen atom covalently bonded to a very electronegative element. The only elements that are electronegative enough are fluorine, oxygen and nitrogen. The extreme difference in electronegativity causes the covalent bond between the atoms to polarize by attracting the centre of electron density towards the Hydrogen atom. This creates positive and negative ends of the compound.

When the positive end of the compound (the Hydrogen atom) comes into contact with the negative end (the other element) of another compound (please note that the other compound must be the same compound or be capable of forming hydrogen bonds) it will form a temporary bond due to the differences in polarity (sign). This temporary bond is a hydrogen bond.

Examples for compounds capable of forming hydrogen bonds are water (H2O), hydrogenflouride (HF) and the base pairs found in DNA.

Answer 2

I know of two for sure. Water is one, which is why water expands when it freezes. As the molecules slow down they align with each other due to hydrogen bonding. DNA is another one. The 4 (or 5 in RNA) compounds in DNA that make up our genetic code are attracted to their counterparts through hydrogen bonding (either 2 or 3 connections, depending on the compound.

There are two more compounds that come to mind when you consider what's needed to form a hydrogen bond. To form a hydrogen bond, at least one of three elements (N, O, and F) has to be covalently bonded to hydrogen. So to get the most basic H-bond compounds, it's a matter of combining hydrogen with each one. One of those three combinations has been mentioned above (H2O). The other two would be NH3 and HF.

Answer 3

Hydrogen bonds are formed within molecules. In chemistry, they are the strongest of the 3 types of bonds (London Dispersion, Dipole-Dipole, and Hydrogen Bonding). Molecules that have hydrogen bonds have to have bonds between hydrogen and nitrogen or hydrogen and oxygen or hydrogen and fluorine (N-H, O-H, or F-H).

Answer 4

Water forms hydrogen bonds between the individual water molecules. A hydrogen bond is a weak bond that forms when a hydrogen atom within one molecule is attracted to nitrogen, oxygen, or fluorine atoms in another molecule.

Answer 5

A compound forms hydrogen bonds if it contains at least one hydrogen atom and also it must be electronegative enough to attact the electron density towards it so the covalent bond is polarised. Examples are hydrogen fluoride, water and ammonia; these have the strongest hydrogen bonds. Other (less electronegative) compounds are hydrogen chloride, hydrogen sulphide and phosphine.

Answer 6

Oxygen and hydrogen atoms are the only atoms that can make hydrogen bonds

Answer 7

For hydrogen bonding to occur, there should be hydrogen atoms attached to either a nitrogen (N), an oxygen (O) or a fluorine (F) atom, such as OH, HN, and HF.