distinguish between pure and impure substances;
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A pure substance consists of particles of only one kind.
IT has certain characteristics such as specific temperature for boiling point,freezing point,melting point..
cannot be separated by using physical methods.
Impure substance has particles of other substances mixed in it.
one of the impure particles has individual properties.some properties doesn't change after mixed.
but the boiling temperature and freezing point may changed.
can be separated by using physical methods.
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