SCIENCE
Marks : 283
what is boiling point of Sater
as its constituent elements.
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is the
Clement of
1. Fill in the blanks:
1. The boiling point of water is
2.Water contains
and
3. Water has maximum density at
4.Water changes to ice at
dencityofuae
11. Answer the following:
1.Why does sea water called as saline water?
2. Water is called as universal solvent .Why?
3.Name the salts which are causes the hardness of water.
4.List down the gases dissolved in water. What are the uses of it?
5.Give any five examples of water pollutants from industries.
III. Draw a concept map for the giver titles:
1. Sources of water pollution
2. Removal of hardness of water
3. Purification of water.
Answers
Answer:
happy maha shivratri to all
Answer:
1.Water Vapour
2.Air
3.sea
4.frezzed
1.saline means salty
2.Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. This is important to every living thing on earth. ... This allows the water molecule to become attracted to many other different types of molecules.
3.iodine
4.nitrogen and carbon dioxiode.
5.Sewage (Waste Water) Sewage is another name for waste water from domestic and industrial processes. ...
Agricultural Pollution. ...
Oil Pollution. ...
Radioactive Substances. ...
River dumping. ...
Marine Dumping.
1.Sources of Water Pollution
Sewage (Waste Water) Sewage is another name for waste water from domestic and industrial processes. ...
Agricultural Pollution. The agriculture industry covers 76% of the land area of England and Wales. ...
Oil Pollution. ...
Radioactive Substances. ...
River dumping. ...
Marine Dumping.
2.The most common means for removing water hardness rely on ion-exchange resin or reverse osmosis. Other approaches include precipitation methods and sequestration by the addition of chelating agents.
3.In certain areas of the world that do not have access to water treatment plants, alternative methods of purification must be used. Those methods include boiling, granular activated-carbon filtering, distillation, reverse osmosis, and direct contact membrane distillation.