Complex mixture

A material containing many chemically distinct components, often making its composition difficult to separate, identify, or quantify.

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Chemical mixture: Matter containing two or more substances physically combined without forming a single pure compound. A complex mixture is a chemically diverse instance of this broader kind of matter.
Analytical chemistry: The science of identifying substances and determining their amounts in samples. Complex mixtures are a central challenge for analytical methods.
Crude oil: Naturally occurring petroleum composed of hydrocarbons and smaller amounts of other substances. Its many compounds require extensive separation and characterization.
Pure substance: Matter with a uniform, defined chemical composition and characteristic properties. A pure substance has one defined composition rather than many varying components.
Chemical compound: A pure substance whose constituent elements are chemically bonded in fixed proportions. Unlike a compound, a mixture can contain components in variable proportions.
Chromatography: A family of methods that separates mixture components through their different interactions with stationary and moving phases. Differential interactions can resolve components that coexist in a complex sample.
Petroleum refining: The industrial processing of crude oil into fuels, lubricants, and chemical feedstocks. Refining separates broad component fractions from a complex feedstock.
Simple mixture: A mixture containing few components whose identities and proportions are comparatively straightforward to determine. It contrasts with mixtures whose component count or analytical overlap impedes characterization.
Chemical species: A chemically distinct entity, such as an atom, molecule, ion, or molecular group. Counting distinct species clarifies what makes a mixture chemically complex.
Mass spectrometry: An analytical technique that measures ions according to their mass-to-charge ratios. It helps identify and quantify compounds after or during mixture separation.