In chemistry this is not considered 'pure' and is a mixture. Miss Fong: Today we're going to be looking at pure and impure substances and how we can test for purity. First, let's cover the basics.

The label means that the contents are just orange juice, with no other substances added. However, the juice is not pure in the chemical sense, because it contains different substances mixed together.

A chemical element is one of those squares ... We also, confusingly, tend to refer to pure substances made of one kind of atom, like chlorine gas, as elements. But these are very different from ...