Separation Of Substances

In threshing, the stalks are beaten to free the grain seeds. Threshing can be done with the help of bullocks or machines.

Hand picking is used to separate slightly large sized impurities. It is used when the quantity of impurities is not very large.

a). To separate two different but useful components.
b). To remove impurities or non useful component from a mixture.

Winnowing is separating the heavier and lighter components of a mixture by wind or by blowing air. For example-separating mixture of saw dust and sand.

Sieving allows the fine particles to pass through the holes of a sieve while bigger impurities remain on sieve. E.g. separating bran from flour.

When no more solute (e.g. Salt) can be dissolved in the amount of solvent (e.g. Water) taken, the solution is said to be saturated solution.

When steam comes in contact with the metal plate cooled with ice, it condenses and forms liquid water.

The process of conversation of water vapour into its liquid form is called condensation.

Salt, sand and water can be separated by decantation, filtration, evaporation followed by condensation.

The process of conversion of water into its vapour is called evaporation.The process of conversation of water vapour into its liquid form is called condensation.

When the heavier component of a mixture settles after water is added to it, the process is called sedimentation

a). Evaporation
b). handpicking.

a) True b) true c) false.