Q6. Answer the following questions:
1. How is common salt obtained from sea water?
2. What is the effect of temperature on solubility?
3. Differentiate between saturated and unsaturated solutions.
4.
Write various methods of separation of substances from their mixture.
Answers
Answer:
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1. Sea water contains many salts mixed in it. One of them is common salt, when sea water is allowed to stand in shallow pits, water gets evaporated by sunlight and slowly turns into water vapor. In a few days, the water evaporates completely leaving behind the solid salts. Common salt is then obtained from this mixture of salts by further purification.
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2. For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
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3.saturated
A saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds. A fat is made of two kinds of smaller molecules: glycerol and fatty acids
unsaturated
An unsaturated fat is a fat or fatty acid in which there is at least one double bond within the fatty acid chain
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4. here some methods -
- Handpicking, winnowing, sieving, sedimentation, decantation and filtration are some of the methods of separating substances from their mixtures.
- Husk and stones could be separated from grains by handpicking.
- Husk is separated from heavier seeds of grain by winnowing.