Explain why, a solution of salt in water is considered a mixture and not a compound.

Compound:

• A pure substance constituted of two or more elements combined chemically in a fixed ratio is called a compound.
• It can't be split into these simpler and different substances by chemical means. Its components cannot be separated easily by physical means.
• For example, $\mathrm{Sodium}\mathrm{Chloride}\left(\mathrm{NaCl}\right)$.

Mixture:

• When two or more substances are mixed without having any chemical change, then the final substance is known as a mixture.
• Its components are not in a fixed ratio.
• Its components can be separated easily by physical means.
• For example, a mixture of salt in water.

Conclusion:

So, A solution of salt in water is considered a mixture, because the components of this solution are not combined in a fixed ratio and can be separated easily by physical method such as evaporation.