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Terms in this set (17)
Reasons for separating mixtures
1. To remove desirable components
2. To remove harmful components
3. To obtain pure substances
4. To obtain useful substances
2. To remove harmful components
3. To obtain pure substances
4. To obtain useful substances
Handpicking
The method of separation in which slightly larger sized impurities in a mixture can be separated by just picking them out with the help of the hand from the mixture.
Threshing
The method of separating grain from stalks, etc. Sometimes, this is done with the help of bullocks. Machines are also used to thresh large quantities of grain.
Sieving
The method of separating solid mixtures which have components of different sizes with the help of a sieve.
Winnowing
The method is used to separate husks with the help of wind from various types of grains.
Magnetic separation
The method in which iron fillings are separated with the help of magnets.
Sedimentation
The solid matter which settles down at the bottom of a liquid is called a sediment and the deposition of solid matter at the bottom of a liquid is called sedimentation. This method is used to separate insoluble substances from a liquid.
Decantation
When you pour out the water after the process of sedimentation, it is called as decantation.
Loading
The process in which alum particles are deposited on suspended clay particles of muddy water to make them heavy and settle down rapidly
Filtration
A method that uses a porous cloth/paper to separate a solid from a liquid.
Distillation
The process of purifying a liquid by successive evaporation and condensation.
Evaporation
The process of a liquid changing into gas. This process is used to obtain a solid substance that has dissolved in water.
Saturated solution
A solution in which no more substances can be dissolved at that temperature is called a saturated substance.
Effect of heating on a saturated solution
The solubility of the substance will increase or more of the substance can be dissolved in it.
Effect of cooling on a saturated solution
The solubility of the substance will decrease and some of the dissolved substance will separate out in the form of solid crystals.