Are separations of mixtures physical or chemical changes?

Separations of mixtures would be a physical change because you are not changing the chemical make-up of the mixture.

Methods of separating mixtures | Distillation | Solubility

Mixtures can be separated into their constituents by using physical methods (i.e. no chemical reaction involved). Separation techniques are physical methods.

Dissolving Salt in Water: Chemical or Physical Change?

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Primary Wastewater Treatment (Physical/Chemical Solids Separation) Primary treatment involves the physical separation of suspended solids in the form of fat, oil, grease, and other biological pollutants leading to the reduction of biological oxygen demand (BOD) from a waste stream.

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Chemical substance - Wikipedia

A chemical substance, also known as a pure substance, is a form of matter that consists of molecules of the same composition and structure. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds.

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Separation process - Wikipedia

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Chemical Separations

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Separating Mixtures - [email protected]

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