What is a technique to separate substances?

Question

and what are practical uses for it?

Answer 1

do it manually.(picking chaff from wheat)
allow to settle.(impurities from liquids)
filteration.(again impurities from liquids)
distillation.(the lighter substance will evaporate)
heavy media separation.(washing of ores)
froth floatation.(recovering fine partocles)

Answer 2

i can give you three easy ones that are completely logical:

Sort substances by physical size using a grate or screen wire. That is how folks sort shrimp (by size), rocks from gravel, etc.

Pour water over the substances. Some substances will dissolve, wash away easily, and others won't. Panning for gold is a process in which raw ore bearing sands and dirt are washed with water in a pan. The sand is washed out by the water. The dirt dissolves into muddy water and sand. The gold remains behind on the bottom of the pan because it is the heaviest.

Shoot compressed air over the mixed substance and the lightest of the two will be blown away. Use: separating the wheat from the chaff. Chaff gets blown away because it is the lightest.

Answer 3

there are several ways to seperate the substances depending on various factors like both are in same physical state or in different physical state. if both are in same state what is the difference in their meltin points ( if they are solids ) and what is the difference in their boiling points ( if they are liquids ).

various techniques are as follows :

removal of soild impurites if they are solid and in big size : centrifugal force method

if it contains Fe ( iron ) as imputites then seperate them by magnetic seperation method

for removal of sulphid ores : froth flotation process

For removing chemical impurities like oxides or carbontes : roasting,calcination and melting and then reduction

reduction also can be of types like (a) chemical reduction and (b) electrochemical reduction

for extra pure compounds you can have electrolysis process , purification methods and sectional purification methods

for purification you can have methods like Filteration,crystallization,sublimation,Distillation : (a) simple distiallation and Fractional distillation., Sepearation by extraction method and chromatography( latest method )

do revert back for any further details for the same

Answer 4

Harry has given you a good frame of an answer. Now, go read your Chemistry text for the body.

Answer 5

liquids can be heated , boiling points are different , each can be distilled off by maintaining temp.

centrifuge can be used to spin off lighter liquids

Answer 6

Using a centrifuge is one way.