Question

a piece of sodium metal can be described as
o a pure substance and a compound.
o an impure substance that is reactive.
o an impure substance that is unreactive.
o a pure substance and an element.

Explanation:

Sodium is an element on the periodic table. Elements are pure substances. Sodium is highly reactive but that's not relevant to it being a pure substance and an element.

Answer:

a pure substance and an element.