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Two broad categories are mixtures and pure substances . A pure substance has a constant composition . All specimens of a pure substance have exactly the same makeup and properties . Any sample of sucrose -LRB- table sugar -RRB- consists of 42.1 % carbon , 6.5 % hydrogen , and 51.4 % oxygen by mass . Any sample of sucrose also has the same physical properties , such as melting point , color , and sweetness , regardless of the source from which it is isolated .
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