no, an element
no, because the simplest form of substance are elements
You think probable to a pure stoichiometric compound.
A compound is a pure substance.
F2 (fluorine) is an element and thus a pure substance. However a compound is a pure substance as well.
If this compound is refined can be classified as a pure substance.
A pure substance is an element or a compound.
Toluene is a compound. not a mixture
Dextrose is a pure substance.
Carbon dioxide (CO2) is a compound and can be also a pure substance.
Pure substance.
It is a pure substance as well as a compound
Pure sugar is a substance (compound).