Question

• Write Types of Combustion with Examples ?

• Calorific Value of Fuel with Examples ?

• Harmful Impact of Burning Fuels ?

• Deforestation ?

• Ways to Save Fuel ?

Class 8th Chapter name :- Combustion and Flame
Please help me Guys It's Urgent​

Answer 1

Answer:

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Explanation:

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Answer 2

Combustion is a chemical process where any fuel has a reaction with air (oxidant) to produce heat energy

Types of Combustion

1] Complete Combustion

An example of this is when a candle burns. The heat from the wick will vaporize the wax which reacts with the oxygen in the air. The two products of the reaction are water and carbon dioxide. In an ideal situation all the wax burns up and complete combustion takes place

2] Incomplete Combustion

An example is when you light a candle. The heat energy is provided when we light the candle with a matchstick. And it will carry on till the wax burns out. Hence it is a rapid combustion


What is the Calorific value?
Calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal conditions. It is also called calorific power. The unit of calorific value is kilojoule per kilogram i.e. KJ/Kg.

Cow Dung 8000

Wood 22000

Coal 33000
Biogas 40000

Diesel 45000
kerosene 45000
Petrol 45000
Methane 50000
LPG 55000

Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health. Sulfur dioxide (SO2) emissions, primarily the result of burning coal, contribute to acid rain and the formation of harmful particulate matter.

Deforestation is the permanent removal of trees to make room for something besides forest. This can include clearing the land for agriculture or grazing, or using the timber for fuel, construction or manufacturing. Forests cover more than 30% of the Earth's land surface, according to the World Wildlife Fund

Practice Conservation at Home. Conserving your electrical use at home reduces the amount of fossil fuels used by reducing overall electrical demands. ...
Use Alternate Transportation. Every time you drive your vehicle, you consume fossil fuels. ...
Green Your Car. ...
Use Alternative Energy. ...
Raise Awareness.