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what are homogeneous and heterogeneous mixtures?

A mixture is said to be homogeneous if it has the same composition and properties through out .
Example  :   Bronze -a mixture of copper (80 %) ,zinc (2% ) and tin (18 %)
Constituents  of mixture - uniformly mixed
Composition                   -  uniform through out mixture.

Heterogeneous mixture : A mixture is said to be heterogeneous if different parts of it have different composition and properties.
Example  :   Gun powder -mixture of charcoal ,sulphur and nitrite (KNO3 ) 
Constituents of mixture -not uniformly mixed .
Composition - varies through out the mixture .


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