Pure sugar is a substance (compound).
a mixture
pure substance
Aluminum is an element, a pure substance.
Pure substance.
Uranium is a natural chemical element, a pure element.
pure, its an element
Copper metal is an element and thus a pure substance.
Neither. Oxygen is an element, which is a pure substance and not a mixture.
mixture
It's an element. So, yes, it's a substance, not a mixture.
Silicon is an element. Its symbol is Si.
quarts is a solid it is a pure substance and it is a element