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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

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

Mixtures:

             • For example, filtration, distillation, centrifugation

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).