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SAI International School
Subject - Chemistry
Class - VIII
Topic – COMBUSTION AND FLAME
Sub-Topic-Burning of fossil fuels

LESSON NOTES

Burning of fossil fuels

The burning of fossil fuels produces harmful products that
pollute the air around us. So, the increasing use of fuels has
harmful effects on the environment. The harmful effects of
the burning of fuels are.
1. The burning of fuels like wood, coal, and petroleum
products releases unburnt carbon particles in the air.
These fine carbon particles are dangerous pollutants and
can cause respiratory diseases such as asthma.
2. Incomplete combustion of fuels produces a very
poisonous gas called carbon monoxide. Excessive
inhaling of carbon monoxide gas can kill a person. We
should never sleep in a room with closed doors and
windows, and having a coal fire burning inside. Because
due to insufficient combustion of coal due to lack of oxygen produces carbon monoxide
gas and they can breathe it and may die.
3. Burning of fuels releases carbon dioxide gas in the environment. Increased percentage
of carbon dioxide gas can cause global warming.
4. Burning of coal, petrol, and diesel produces sulphur dioxide and nitrogen dioxide gas
which goes into the air and causes acid rain.

CNG

The use of petrol and diesel as fuels in automobiles is
being replaced by CNG (Compressed Natural Gas). CNG
produces a very small amount of harmful products is a
clean fuel because it burns without producing smoke. Since
the burning of CNG produces much less harmful products
and smoke, therefore, the use of CNG as fuel in
automobiles has reduced air pollution.