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Industries
A quick count of industries based on forest produce reveals timber, paper, resin and gum, lac, natural oils, minor foods products, medicines, sports equipment. Industries consider the forest as merely a source of raw material for their factories. They neither are int..
Soil Pollution by Industrial Effluents and Solid Wastes
Large quantity of solid wastes like unused and rejected chemicals (like calcium carbonate, magnesium sulphate, ferrous chloride, ferrous oxide, radioactive wastes, fly ashes, sludge, press mud, saw dust, bottles, plastic materials) unwanted industrial wastes generated duri..
Uses
Some halides of carbon find wide use in industry. For example, Carbon tetrachloride is used as a fire extinguisher under the name pyrene. Carbon tetrachloride is a common solvent for plastics, resins etc. Freon (CF 2 Cl 2 ) is used as a refrigerant..
Safety Glass or Unbreakable Glass
It is prepared by placing a layer of transparent plastic (sheet of vinyl acetate resin) between two layers of glass and sealing the layers with adhesive..
Uses of Formaldehyde
Formaldehyde is Used as - antiseptic and germicide preservative for biological and anatomical specimens substitute for tanning in leather industry - This is because it can harden glue or gelatine and thus renders them insoluble in water reactant in the manufacture of formaldehyde res..
Static Electricity
Static Electricity - Static electricity was known to people more than 2500 years ago. The Greeks knew about the attractive property of the resin amber. They knew that by rubbing amber with cloth, it could be made to attract small feathers. The Greek name for amber was 'elektron'. After ab..
Uses of Benzene
Uses of Benzene - As an industrial solvent for fats and oils, rubber, resins etc. As a starting material for dyes, drugs, perfumes and explosives and polymers For dry-cleaning of woollen clothes. As a motor fuel along with petrol, under the name benzo..
Question 9
Question: What direct value does a forest have for man? Answer: Forests contribute to the economic development of our country by providing goods and services to people and industry. They are intimately linked with our culture and civilization. Forests are useful to humans for t..
Soil Pollution and Solid Wastes
Pollution of Soil Surface - Large quantity of solid wastes like unused and rejected chemicals (like calcium carbonate, magnesium sulphate, ferrous chloride, ferrous oxide, radioactive wastes, fly ashes, sludge, press mud, saw dust, bottles, plastic materials) unwanted industrial..
Polymerization
is the process of formation of large molecules or macromolecules with high molecular weight from small molecules. 'Poly' means many and 'meros' means parts in Greek. The simple compounds from which these macromolecules are made are called monomers . When two monomers combine, a dimer is got. The ..
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