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Chemical substances (also sometimes referred to as a pure substances) are often defined as any material with a definite chemical composition in most introductory general chemistry textbooks. According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. However, there are exceptions to this definition, a pure substance can also be defined as a form of that has both definite composition and distinct properties and the chemical substance index published by CAS also includes several alloys of uncertain composition.

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17y ago

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