Question

give the answer correctly​

Answer 1

Answer:

1)the following reasons:

i. To remove an undesirable component - Tea is made by boiling tea leaves in water and then adding milk and sugar. After the tea has been made, the used tea leaves become the undesirable component of the mixture 'tea' and are removed from it by using a tea strainer.

ii. To remove a harmful component - Foodgrains like rice, wheat, pulses etc. usually contain small pieces of stones and some insects etc. These are harmful to us and are hence removed from the foodgrains before using them.

iii. To obtain a pure sample of a substance - Tap water contains some dissolved salts in it so it is an impure mixture. This water is made free of dissolved salts or impurities by the process of distillation and as a result, we get a pure sample of water.

iv. To obtain a useful component - Milk is a mixt from which useful component 'butter' is separate..

2)..For example, in a mixture of sand and water, sand settles down at the bottom. This is sedimentation. Decantation is the process of separating liquid components of a mixture while the solid component has settled at the bottom as sediments, that is, transferring a liquid from another container

3)Principal :- The centrifuge works using the sedimentation principle, where the centrifugal acceleration causes denser substances and particles to move outward in the radial direction. At the same time, objects that are less dense are displaced and move to the center. Cyclonic separation is a type of centrifugation.

4)Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. Crystallisation is better than evaporation because during Evaporation. ... Some impurities may remain dissolved in the solution even after filtration which on evaporation contaminates the solid

5)i) Butter from curd can be separated by the technique of centrifugation. (ii) Salt from sea water can be separated by the technique of crystallization or by the evaporation. (iii) Camphor is sublimable but salt is not. So, camphor can be separated from salt sublimation technique.

6)a technique for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at different rates

7) sedimention

I don't know

Answer 2

1) The mixtures are separated into their components for the following reasons:

• To remove an undesirable component - Tea is made by boiling tea leaves in water and then adding milk and sugar.
• To remove a harmful component - Foodgrains like rice, wheat, pulses etc.

2) Sedimentation and decantation methods are used for the separation of insoluble substances which are heavier than liquid. In the sedimentation process, heavier components of the mixture settle on the bottom, due to gravity. Decantation follows sedimentation.

For example, in a mixture of sand and water, sand settles down at the bottom. This is sedimentation. Decantation is the process of separating liquid components of a mixture while the solid component has settled at the bottom as sediments, that is, transferring a liquid from another container.

3) Centrifugation separates the components of heterogeneous mixtures. These include liquids in liquids, solids in liquids, and solids and liquids in gases. Centrifugation uses centrifugal force to move dense components to the outside of the container. This causes the solid to settle more rapidly and completely.

4) The crystallization technique is better than evaporation because the extent of purification with crystallization is very high as it does not require very high-temperature conditions. Hence, there is no need to boil the solvent.

5) (i) Butter from curd can be separated by the technique of centrifugation.

(ii) Salt from sea water can be separated by the technique of crystallization or by the evaporation.

(iii) Camphor is sublimable but salt is not. So, camphor can be separated from salt sublimation technique.

6) Chromatography is a method used by scientists for separating organic and inorganic compounds so that they can be analyzed and studied. By analyzing a compound, a scientist can figure out what makes up that compound. Chromatography is a great physical method for observing mixtures and solvents.

7) (b) sedimentation

8) ....

9) Because of the motion, the larger particles of the colloid are being constantly bombarded by the smaller particles of the liquid. This motion and bombardment keeps the colloid particles suspended and is called Brownian motion.

10)

1. mercury
2. bromine
3. sodium & potassium
4. graphite

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