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how is matter classified as a mixture or pure substance based on its properties?

See below  

Step-by-step explanation:

Matter is either a pure substance or a mixture.

Pure substances

Are composed of one type of atom or molecule. Have a constant chemical composition Have fixed chemical properties Have fixed physical properties

              • For example, melting point, boiling point, density, solubility

Mixtures:

Consist of two or more substances not chemically combined Have a variable composition Can be separated into two or more components by physical means

             • For example, filtration, distillation, centrifugation

Each component retains its own properties

Outermost (valence) electrons

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