List Different Types Of Heterogeneous Mixtures? Explain Each With The Help Of An Example?
Answer:
Heterogeneous mixtures can be of two kinds: One is suspensions and the other is colloidal dispersions. They have been explained as following:
o Suspensions: Suspensions contain considerable particles (over 1000 nm long) of insoluble solid or liquid suspended in (scattered throughout) a gooey. In time, the particles settle out. Solid particles suspended in a juice can be separated from the liquid by using the technique of filtration through filter paper and by centrifugation. For example, in blood, the red and white blood cell are suspension in the plasma. If a sample of blood is left for a time, the cell settle out. The separation is accelerated by centrifuging the sample.
Colloids: Colloids are heterogeneous mixtures whose particles are larger than the molecules and ions that form solutions, but smaller than the particle that form suspensions (between 1 nm and 1000 nm long). Gelatin and water for example form a colloid. Particles of gelatin are dispersed (spread) through the water. The two components cannot be separated by simply filtration through filter paper. Colloids are also call colloidal dispersions and colloidal suspensions. The solid (gelatin) is the disperse phase, and the liquid (water) is the dispersion phase or dispersion medium. Other examples of colloids include aerosol spray cans, milk, mayonnaise etc.
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