Separation and Identification - Separating by size
Separating by size
Size is one method used to separate many simple mixtures. If the parts of a heterogeneous mixture are large enough, the mixture can be separated by hand or by a sieve. A sieve has holes in it that are small enough for some of the solid substance or substances to pass through and the larger particles will remain above the holes. Soil, for example, is sifted through a sieve to separate out the chunks of rock and gravel from the fine soil particles.
Filtration is a commonly used separation technique similar to a sieve except it separates undissolved solid particles from a liquid. In filtration, a mixture passes through a filter, a material with spaces in it that holds back the particles. Filters are used frequently to clean water, make coffee, and purify air.
Other simple separation techniques include settling and evaporation....
[The entire page is 220 words long]
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