Element
The terms element and compound are used to identify pure substances.
There is no such thing. An element IS a pure substance.
I believe that is an element.
You may regard distilled water as a pure substance. Common salt would be another, as would refined sugar.
pure substance, propanone
lame people going wild
Physical properties are characteristics of a pure substance that can be observed without changing it into another substance. Chemical properties are characteristics of a pure substance that describes its ability to change into different substance.
Another name for a substance is a material.
Pure substance
it is a pure substance.... not
Methane is a pure substance.
Potassium is a metallic element and a member of the Alkali Metal group, it has the symbol K which is derived from its old name of Kalium.