Ans. Oil floats on water and form separate layer. Separating funnel can be used to separate the two.
Ans. We are able to dissolve more solute in a solvent at high temperature because high temperature facilitates dissolving reaction by providing energy to break bonds in the solid.
Ans. Sieving is not used to separate very small stones from rice grains because both are of almost same size and both will pass through the holes of the sieve.
Ans. Third beaker
Handpicking is a method used to separate larger impurities like pieces of dirt, stones etc. just by picking them out with the help of hand from the mixture.
Threshing is a method of separating grains or seeds from the stalks by some mechanical means such as by beating with a flail or by the action of a threshing machine.
The process of conversion of water into water vapor is called evaporation.
The process of conversion of water vapor into its liquid form is called condensation.
A solution in which no more solute (such as sugar or salt) can be dissolved in the given amount of solvent (such as water) at a particular temperature is known as saturated solution.
A solution in which more solute (such as sugar or salt) can be dissolved in the given amount of solvent (such as water) at a particular temperature is known as unsaturated solution.
Decantation is the process of removing liquid from mixture when heavier component settles down at the bottom of container.
A mixture of soluble solid in liquid is called solution.
Substance that is dissolved is called solute.
The liquid in which the solute dissolves is called solvent.
Strainer is a device with holes punched in it or made of crossed wires for separating solid matter from a liquid.
Ans. Winnowing is the method in which heavier components of the mixture are separated from the lighter components such as chaff, dirt, etc. by dropping mixture from height into the air. This method is used by farmers to separate husk and other lighter impurities from grains.
Ans. We need to separate the components of a mixture for the following reasons:
i. To separate two different but useful components from the mixture.
ii. To remove non – useful components from the mixture.
iii. To remove impurities or harmful substance from the mixture.
iv. To remove the unwanted impurities from the mixture.
v. To obtain pure substances by removing the other substances.
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