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
“ Gaining knowledge ,is the first step to wisdom,Sharing it ,is the first step to Huminity”
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.
Join EILM.COM.PK Learning Program
A student’s also look the latest Posts,and go to Blog for the Latest Stories,
Discoveries, Fun Activities, Exam Tips, and more.