Question

Sodium metal is a pure substance and so is sodium chloride, inspite of the fact that sodium chloride contains two different elements. Explain.

Answer 1

Yes ,NaCl is considered as a pure substance as it is a salt and cannot be broken down without changing its composition.Thats why it is regarded as a pure substance instead of containing two elements Na and Cl.

Answer 2

Explanation:

A pure substance is defined as a substance that contains same atoms or contains atoms in fixed ratio by mass.

For example, a sodium metal is a pure substance because it contains only sodium atoms. Whereas sodium chloride is a compound as it contains two different atoms which have similar composition. Hence, sodium chloride has fixed ratio by mass.

Therefore, sodium chloride is also considered as a pure substance.