Home » CBSE Class 11th Chemistry Notes for Chapter 14 Environmental Chemistry

CBSE Class 11th Chemistry Notes for Chapter 14 Environmental Chemistry

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              UNIT 14 ENVIRONMENTAL CHEMISTRY
 
ENVIRONMENTAL POLLUTION
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 known as a pollutant.
 
ATMOSPHERIC POLLUTION
Tropospheric pollution occurs due to:

  • Gaseous air pollutants
    • Oxides of sulphur
    • Oxides of nitrogen
    • Oxides of carbons, etc.
  • Particulate air pollutants
    • Dust
    • Mist
    • Fumes
    • Smoke
    • Smog, etc.

Stratospheric pollution occurs due to chemicals like CFCs breaking down the ozone causing ozone hole.
 
WATER POLLUTION
Causes of water pollution:

  • Pathogens: These are the disease causing agents like bacteria and other organisms.
  • Organic wastes: Organic matter such as leaves, grass, etc. also lead to water pollution.
  • Chemical pollutants:  These include heavy metals, acids, industrial wastes ,etc.

 
 
SOIL POLLUTION
Causes:

  • Pesticides
  • Soil erosion

 
GREEN CHEMISTRY
Green chemistry is a way of thinking and is about utilising 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 about minimum pollution or deterioration to the environment.
Green chemistry in day-to-day lives

  • Dry cleaning of clothes
  • Bleaching paper
  • Synthesis of chemicals

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