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Oxygen
O2
Hydrogen
H2
Water
H2O
Carbon dioxide
CO2
Carbon monoxide
CO
Hydrochloric acid
HCl
Sodium chloride
NaCl
Iron (III) oxide
Fe2O3
Pure Substance
A substance made up of only one type of particle (Element or Compound) and is chemically bonded together.
Impure Substance (Mixture)
A substance made up of two or more types of particles.And is not chemically bonded together.