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Environmental Chemistry Class 11 Notes For Chemistry Chapter 14

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•  Environmental chemistry deals with the study of the origin,transport,reactions,effects,fates of chemical species in the environment.


Environmental pollution is the effect of undesirable changes in our surroundings that have harmful effects on plants, animals and human beings.A substance which causes pollution is called a pollutant.they can be solid,liquid or in the gaseous state.


The atmosphere that surrounds the earth is not of the same thickness at different heights.Atmospheric pollution is generally studied as tropospheric and stratospheric pollution.The ozone layer prevents about 99.5%of the sun’s UV rays.


Tropospheric pollution occurs due to the presence of undesirable solid  or  gaseous particles in the air. The following are the major gaseous and particulate pollutants present in the troposphere;

•  Gaseous air pollutants:These are oxides of sulphur, nitrogen and carbon, hydrogen sulphide, hydrocarbons, ozone and other oxidants.

•  Particulate  pollutants; these are dust, mist, fumes, smoke, smog etc


About 75% of the solar energy reaching the earth is absorbed by the earth’s surface,which increases it’s temperature.The rest of the heat radiates back to the atmosphere.Some of the heat is trapped by the gases such as carbon dioxide,methane,ozone,CFCS and Water vapour.they add to the heating of the atmosphere causing Global warming In a greenhouse,visible light passes through the transparent glass and heats up the soil and the plants.The warm soil and plants emit infrared rays,it partly reflects and partly absorbs these radiations,this mechanism keeps the energy of the sun trapped in the greenhouse.


When the pH of the rain water drops below5.6, it is called acid rain.Acid rain is harmful for agriculture, trees and plants as it dissolves and washes away nutrients needed for their growth. It causes respiratory ailments in human beings and animals. When acid rain falls and flows as ground water to reach rivers, lakes etc. it affects plants and animal life in aquatic ecosystem


The word smog is derived from smoke and fog.There are two types of smog:classical and photochemical smog. Classical smog occurs in cool humid climate. It is a mixture of smoke, fog and sulphur dioxide. It is also called reducing smog. Whereas photochemical smog occurs in warm and dry sunny climate. It has high concentration of oxidizing agents and therefore ,it is also called as oxidizing smog.


Depletion of ozone layer is known as ozone hole.


With the depletion of ozone layer, more UV radiation filters into troposphere. UV radiations lead to ageing of skin, cataract, sunburn, skin cancer, killing of many phytoplanktons, damage to fish productivity etc


contamination of water by foreign substances which make it harmful for health of animals or plants or aquatic life and make it unfit for domestic, industrial and agriculture use.


Sewage and domestic wastes Industrial effluents Agriculture effluents Siltation-mixing of soil or rock into water Thermal pollutants Radioactive discharge


The process in which nutrientenriched water bodies support a dense plantpopulation, which kills  animal life by deprivingit of oxygen and  results  in subsequent loss ofbiodiversity is known as Eutrophication.


The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water, is called Biochemical Oxygen Demand (BOD)


Insecticides, pesticides and herbicides cause soil pollution.


Green chemistry us a way of thinking and is about utilizing the existing knowledge and principles of chemistry and other sciences to reduce the adverse impact on environment.Green chemistry is a production process that would bring out minimum pollution or deterioration to he environment..Utilization of  existing  knowledge  base  for  reducing  the chemical hazards along with the development of activities is the foundation of green chemistry.

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