10 Chemistry The Atmosphere Notes Punjab Curriculum

The Atmosphere MCQ`s ,Short Questions and Long Questions Free PDF Download Punjab Curriculum

Chemistry Chapter 14 The Atmosphere Complete Notes MCQ`s, Short Questions and Long Questions

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Key Points of Chapter 14 The Atmosphere Notes

  • Atmosphere is the envelope of different gases around the Earth.
  • Atmosphere is divided into four regions; troposphere, stratosphere, mesosphere and thermosphere.
  • Troposphere is just above Earth’s surface and extends upto 12 kilometre.
  • Stratosphere is next to troposphere and extends upto 50 km. In this region, temperature rises upwards because of presence of ozone layer.
  • Mesosphere is next to stratosphere and extends up to 85 km.
  • Thermosphere lies beyond mesosphere.
  • Natural sources of air pollutants are volcanic eruption and decomposition of organic matter.
  • Source of air pollutants because of human activities are burning of fossil fuel in combustion engines of automobiles, kilns of industries, open air fires and forest fires.
  • CO2 forms a layer around Earth, that absorbs the infrared radiations emitted by Earth surface. Thus, heating up the atmosphere is called greenhouse effect.
  • CO is highly poisonous gas so it is health hazard.
  • SO2 is also health hazard and forms sulphuric acid by combining with water vapours in air. It is also a component of acid rain.
  • Acid rain consists of H2SO4and HNO3 that reduces the pH of rain water to 4.
  • Ozone layer lies in stratosphere about 25 to 30 km away from Earth’s surface.
  • Ozone layer protects Earth like a shield from harmful ultraviolet radiations of sunlight.
  • Chlorofluorocarbons destroy ozone molecules, depleting the ozone called ozone hole.
  • Depletion of ozone enables ultraviolet radiations of the Sun to reach the Earth; causing infectious diseases; changing the life cycle of plants, wind patterns.
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