[Answer] pure substance

Answer: always has exactly teh same composition
pure substance
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Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. Pure substances are further classified as elements and compounds. An element is a substance that consists of only one type or kind of atom.
In chemistry a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties. To avoid confusion a pure substance is often referred to as a “chemical substance.” Examples of Pure Substances Examples of pure substances include chemical elements and compounds.
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A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous. Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom.
A pure substance or chemical substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample. A pure substance participates in a chemical reaction to f…

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