Question

Classify each of the following as a pure substance or a mixture
an iron (Fe) nail
propane (CzHg)
a salt substitute (KCI)
A club soda
a slice of onion pizza

Answer 1

an iron (Fe) nail - pure substance (element)
propane (C3H8) - pure substance (compound)
a salt substitute (KCl) - pure substance (compound)
A club soda - mixture
a slice of onion pizza - mixture