A pure substance has a/an composition. A/An is composed of two or more types of matter that can be present in varying amounts. A solution is a/an mixture. A mixture that is not uniform throughout is a/an mixture. A pure substance that cannot be broken down chemically is a/an .A characteristic of matter that’s not associated with a change in its chemical composition is known as a/an property. Wax melting is an example of a/an change in the state of matter. A banana peel turning brown is an example of a/an change in the state of matter.