Question

what are pure substances​

Answer 1

$\huge\mathfrak\red{ANSWER}$

✍Pure substances can be elements compounds and element is a form of matter that cannot be broken down by chemical reactions into simpler substances.

Answer 2

Answer:

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.