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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

1 answer

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