Question

multiple - choice question
what is a pure substance?
it is made of one type of element
it is one type of matter.
it is made of more than one type of matter

Explanation:

A pure substance is defined as a single - type of matter. It can be an element (like gold, \(Au\)) or a compound (like water, \(H_2O\)). If it is made of one type of element, it is a subset of pure substances (elements are pure substances). But the most general and correct definition is that a pure substance is one type of matter. A mixture is made of more than one type of matter.

Answer:

It is one type of matter.