# Chemistry, CI Revision Notes

## CI1

### Nitrogen Chemistry (Group 5)

#### Molecular Structures

The low reactivity of nitrogen molecules arises from the strong triple bond between nitrogen atoms.

Bonding in Nitrogen molecules

The triple bond must be broken before nitrogen molecules can react; this is difficult due to its large bond enthalpy. Most reactions involving nitrogen are done at high temperatures, with catalysts.
Ammonia is nitrogen hydride, coming from the following reaction:

$$N_{2}+3H_{2}\rightleftharpoons 2NH_{3}{}\nonumber \\$$

The lone pair of electrons on nitrogen is not involved in bonding in ammonia, so can form dative covalent bonds.