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a method of separating mixtures based on differences in their boiling points.
the introduction of halogen atoms into a compound by addition or substitution.
the heat of reaction or the change in heat when reactants form products during a chemical...
the separation of a dye into the different colours that make up that dye, as a result of the...
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
the electrons in the outermost occupied shell of an atom.