A pure substance that has molecules of different atoms chemically combined.
A substance that does not evenly combine different types of atoms or molecules.
A substance that evenly combines different types of atoms or molecules.
A pure substance made up of only one type of atom.
What is Oxygen?
What is Soil?
What is Water?
What is Air? (in the atmosphere)
What is Carbon Dioxide?
What is Helium?
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