Achemist is studying an unknown substance. he can break it into its elemental components only by using chemical means how should the unknown substance be classified

Explanation:

An element is defined as a substance that contains same type of atoms.  An element can never be broken down into its constituent particles.

For example, a spoon made up of only copper metal will contain only atoms of copper.

A compound is defined as a substance in which atoms chemically combine together in a fixed ratio by mass.

For example, is a compound.

A compound can be broken down into its constituent particles by chemical means.

therefore, we can conclude that given unknown substance be classified as compound.