The Earth atmosphere is a mixture of gaseous elements and compounds. We can prepare samples of common gases such as hydrogen, oxygen and carbon dioxide in the laboratory and examine their properties and reactions.
it is an unreactive gas. This is because it has a triplecovalent bond between the nitrogen atoms in N2 molecules. This strong triple bond requires substantial energy to break before the nitrogen atoms can react with other atoms.
nitrogen gas is difficult to notice – it’s colourless, odourless and insoluble in water.
its structure is two nitrogen atoms joined by a triple covalent bond. This means it is diatomic.
the triple covalent bond is very strong, and a great deal of energy is required to break it.
the bond needs to be broken before nitrogen will react with other atoms.
Uses of nitrogen
We use nitrogen in two ways:
liquid nitrogen is very cold and makes a good coolant.
nitrogen gas provides an inert atmosphere in food packaging, helping to keep the contents fresh.