matter is of two things pure substances and mixtures

Pure substance-

A homogeneous sample of matter that has the same composition and distinct properties

Pure substances ae made of elements-

Composed of only one type of atom. Simplist form of matter.

And compounds-

Made of 2 or more elements in defined properties can be seperated into simpler substances by chemical reactions 


Combination of 2 or more substances each of which retain their own composition and properties 

There are two kinds of mixtures homogeneous-

Contains 2 or more pure substances mixed together (not chemically combined)

And heterogeneous-

Contains 2 or more pure substances mixed un-evenly 

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