When is separation of substances necessary?Name four methods
used to separate solid substances.
Answers
Answer:
The individual substances in a mixture can be separated using different methods, depending on the type of mixture. These methods include filtration, evaporation, distillation and chromatography.
If a substance does not dissolve in a solvent, we say that it is insoluble. For example, sand does not dissolve in water – it is insoluble.
Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered:
the sand stays behind in the filter paper (it becomes the residue)
the water passes through the filter paper (it becomes the filtrate)
Answer:
Separation is necessary when we want to remove unwanted things from a mixture. This also helps us to obtain the required substances.
Four methods to separate solid substances are : Threshing, Winnowing, Hand-picking and Sieving.