write the features of the following:- a) pure substance. b) mixture.
Answers
(a) Pure Substance is either element or compound. It contains the same kind of atom or molecules and has a definite set of physical and chemical properties.
(b) A substance in which some other substances are also present in smaller or larger amounts is called an impure substance. Mixtures are impure substances.
An example of an impure substance is air.
(c) A homogeneous solid mixture of two or more metals or a metal and a nonmetal is called an alloy.
(d) The homogeneous mixture of water (or any other solvent) and a substance soluble in it is called a solution.”
(e) A mixture in which the components are not uniformly distributed through its volume and can be easily seen separately is called a heterogeneous mixture.
(f) A mixture in which its constituents are uniformly distributed throughout its volume and cannot be seen separately is called a homogeneous mixture.
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