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What is meant by not pure substance?

User Rbasniak
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An impure substance is a material that contains the mixture of two or more pure substances. A pure substance can be an element, which is made up of only one atom or a compound, which is formed by the chemical bonding of one or more atoms. Some examples of pure substances include: water (H2O), Gold(Au), Salt(NaCl), Oxygen(O2), etc. Impure substances do not have a fixed boiling and melting points.

User Cristiano Gehring
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