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Sagot :
substance and mixtures
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Pure substances and mixtures
The pure meaning:
The word 'pure' is used in chemistry in a different way from its everyday meaning. For example, shops sell cartons labelled as 'pure' orange juice. The label means that the contents are just orange juice, with no other substances added. However, the juice is not pure in the chemical sense because it contains different substances mixed together. In chemistry:
•a pure substance consists only of one element or one compound
•a mixure consists of two or more different substances, not chemically joined together
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