Question

Give two reasons to support the fact that water is a compound and not a mixture.

Answer 1

Compounds:

Substances which made up of different kinds of atoms that are chemically bonded, which can not separate by physical methods.

Examples: ${\mathrm{H}}_2\mathrm{O}$, ${\mathrm{NH}}_3$

Mixtures

Materials consist of different substances which are not chemically bonded and can be separated by physical means.

Examples: Naphthalene and sodium chloride

• We know that water has a chemical formula ${\mathrm{H}}_2\mathrm{O}$, in which the hydrogen and oxygen atoms are chemically combined.
• We can not separate the hydrogen, oxygen atoms by any other physical methods.
• The hydrogen and oxygen atoms present in the ratio 1:8 and this ratio is fixed

Hence, we can say that water is a compound, not a mixture.