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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.

Explanation:

1.). A pure substance has a/an ___definite composition.

Pure substances have a definite composition and all their parts are same throughout.

2.). A/An ___mixture is composed of two or more types of matter that can be present in varying amounts.

Mixture is a blend of two or more types of matter.

3.). A solution is a/an ___homogeneous mixture.

Solutions are homogeneous mixtures of solutes and solvents.

4.). A mixture that is not uniform throughout is a/an ___heterogeneous mixture.

A mixture that is not uniform throughout is said to be heterogeneous.

5.). A pure substance that cannot be broken down chemically is a/an .

An element : is a distinct substance that cannot be split-up into simpler substances.

6.). A characteristic of matter that’s not associated with a change in its chemical composition is known as a/an __physical property.

Physical property tells us everything about what a substance is when no change is occuring to its constituents.

7.).Wax melting is an example of a/an ___physical change change in the state of matter.

Physical change is one that alters the physical properties of matter.

8.). A banana peel turning brown is an example of a/an ___chemical change in the state of matter.

Chemical change is one in which a new matter is formed.