matter

Solid, liquid,gas

pure substance

Constant composition

mixture

Matter consisting of two or more pure substances that retain their individual partities and can be separated by physical methods.

compound

Substance composed of two or more elements in fixed proportion can be separated into simpler substances and elements only by chemical methods.

element

Fundamental substances cannot be separated into simple substances by chemical methods.

heterogeneous mixture

Mixture not uniform in composition and properties throughout.

homogenous mixture

Mixture having a uniform composition and properties throughout (also called a solution).