| http://www.w3.org/ns/prov#value | - However, there are exceptions to this definition, a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.[4] and the chemical substance index published by CAS also includes several alloys of uncertain composition.[5] Nonstoichiometric compounds are a special case (in inorganic chemistry) that violates the law of constant composition, and
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