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what is a pure substance pure substances are those that have a fixed and defined chemical composition that is that does not vary regardless of the physical conditions in which said substance is found in other words pure substances remain chemically unaltered their chemical structure does not change in their different states of aggregation using physical separation methods pure substances cannot be decomposed into simpler substances nor into their constituent elements to decompose a pure substance it is necessary to use chemical methods by which the substance is transformed into other substances or into the elements that compose it in addition a pressure in temperature specific can be played for the pure substances physical properties such as density the boiling point and melting point a clear example of a pure substance is water simple and abundant which can exist in liquid gaseous or solid form but it will always be composed of the same chemical elements and will always respond the sa
