Question

Matter that contain two or more constituent substance is called ____.

Answer 1

Matter can be broken down into two categories: pure substances andmixtures. Pure substances are further broken down into elements andcompounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

Answer 2

Matter that contain two or more constituent substances is called an -$\textbf{compound }$-

Since, if that constitutes are not uniform, then it will known as mixture.