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Pure Substance - A pure substance is a single substance on its own. Pure substances have a definite and constant composition, they have definite and constant properties under a given set of conditions.
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."
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.
Pure substances have a uniform chemical composition. Examples include water (liquid), diamond (solid), and oxygen (gas). In chemistry, a pure substance is a material with a constant composition. In other words, it is homogeneous no matter when you sample it.
In chemistry, a pure substance is an element or compound made up of one type of particle. Pure substances have a fixed structure with definite properties.
In chemistry, a pure substance is a single substance made of only one type of particle.
Some people define a pure substance to be a material that consists of one type of "building block" of matter. By this definition, only elements and compounds are pure substances, while homogenous mixtures are not.