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COAL AND PETROLEUM: FREE ENERGY FOUND IN ITS

               COAL AND PETROLEUM

                                                   INTRODUCTION 

Here about some exhaustible natural resource like natural gas, coal and petroleum will be discussed, which are also called non-renewable sources of energy .This is because when all the natural gas coal and petroleum present under the earth will get used up, no more supply of these will be available in the near future.

 

  Natural resource  on Coal and petroleum

The various resources which are obtained from nature are called natural resources e.g. water, soil etc. on the other hand paint, synthetic fibers, plastics and explosives are man-made materials. Natural resources are broadly classified into two categories: `

INEXHAUSTIBLE NATURAL RESOURCES: 

The various resources which are present in an unlimited quantity in nature and are not likely to be exhausted (used up) by human activities are called inexhaustible natural resources e.g. sunlight, air. There are never ending supply of inexhaustible resources in nature. They can be used again and again.

EXHAUSTIBLE NATURAL RESOURCES:

The natural resources which are present in a limited quantity in nature and can be exhausted (used up) by human activities are called exhaustible resources, e.g. natural gas, minerals, forests, wild life , coal and petroleum etc.

COAL: Coal is a hard, black combustible fuel. It is a fossil fuel. In India , coal is found mainly in bihar, West Bengal, Odissa and Madhya Pradesh (in deep coal mines under the surface of the earth)

PROCESS OF  COAL FORMATION ON COAL AND PETROLEUM

About 300 million years ago, the earth had dense forests in low-lying wetland areas.  Due to natural processes like flooding, earthquakes , volcanoes etc. These forests  buried under the surface of the earth. As more soil deposited over them, there were  compression. The temperature increases also as  they are  in more depth . Under high pressure, high temperature and also in the absence of air, the wood of dead plants got slowly converted into coal. Coal contains mainly carbon. The slow process of conversion of dead plants buried deep under the earth into coal terms as  carbonisation. Since, there was coal formation  from the remains of plants,  (coal is also called a fossil fuel).

COAL IS A SOURCE OF ENERGY

Coal contains carbon. When heated in air, coal burns and produces mainly carbon di oxide gas. The reaction can be written as : C + O2 => CO2 + HEAT

USE OF COAL : ( fossil fuel )

  • Coal is one of the fuels  which we use to cook food
  • It  produces electricity in various industries
  • Coal helps in  manufacture of coke, coal tar and coal gas.
  • It is the source of many organic compounds such as benzene, phenol, toluene, naphthalene etc.

PRODUCTS OBTAINED FROM COAL:

When we heat coal  strongly in the absence of air in closed retorts,  we obtain various useful products. The strong heat heating of coal in the absence of air we term as the destructive distillation of coal. These are coke, coal tar and coal gas.

COKE:

 It is a tough, porous and black solid substance. Coke is almost the pure form of carbon.  It contains 98%  carbon. When  we heat coal in the absence of air, then elimination of gas and coal tar occur and we get coke as black residue.( coal and petroleum)

USES OF COKE: 

  • As a reducing agent in the metallurgy.
  • In the manufacturing of steel
  • As a fuel

COAL TAR (fossil fuel )

It is a thick, black liquid with having sticky scent.  it is a mixture of about 200 substances. It contains useful carbon compounds present in coal tar include benzene, toluene, naphthalene, phenol, aniline, and anthracene. 

USE OF COAL TAR on  coal and petroleum

  • We use it in making synthetic dyes
  • Helps in making drugs
  • We can make  explosive
  • Coal tar helps  in making perfume
  • We make  plastics
  • Various paints we can make.
  •  Making in photographic material
  • We use in making roofing material
  • We can do metalling the roads

COAL GAS 

It is a gaseous fuel. We  obtain it during the processing of coal to get coke. It is  mainly a mixture of methane and hydrogen with some carbon monoxide.

USE OF COAL GAS 

  • We use it as a fuel in many commercial and industrial places.
  • Coal gas helps in lighting purposes

PETROLEUM 

Petroleum is  dark in colour, thick in consistent with sticky smell . It is present deep below the earth’s crust trapping in rocks in certain areas.  The name petroleum means rock salt ( petra = rock ; oleum = oil). It is also called crude oil or mineral oil.

 PROCESS OF FORMATION OF PETROLEUM :

The remains of plants and animals went under the sea forming petroleum by the decomposition, millions of years ago. ( coal and petroleum) Long before, the plants and animals which lived in the sea, died and their bodies settled at the bottom of the sea, and silt, mud, sand, clay wrapped those residual bodies.  Due to high temperature, high pressure, and absence of air, these residual bodies convert into petroleum and natural gas.  We can drill the oil wells hole to extract petroleum in the earth’s crust. In the drilling process, natural gas comes first with a great pressure and for a time, the crude petroleum oil comes out by itself due to gas pressure.  Now we can drill out some of the oil wells  under the sea for the extraction of petroleum.

LIQUIFIED PETROLEUM GAS (LPG) on COAL AND PETROLEUM

The petroleum gas which has been liquefied under pressure is known as LPG or  liquefied petroleum gas. It is the most important fuel which we use in homes. It mainly consists of butane. LPG is a good fuel for the following reasons:

  •  Easily combustible  
  • It has a high calorific value (50,000 kJ/kg)
  • LPG burns with a smokeless flame, so it does not cause any air pollution 
  • There is no production of  any harmful gases
  • It does not leave behind any solid residue after burning it does not produce any harmful gases.

PROBLEMS RELATED TO COAL AND PETROLEUM

SHORT TYPE QUESTION

Qs1:   Mention various fractions of petroleum in coal and petroleum.

Ans1:  The various fractions of petroleum are

  • Petroleum gas in liquid form (LPG)
  • Petrol
  • Kerosene
  • Diesel
  • Lubricating oil
  • Paraffin wax
  •  

Qs2: Write the difference between coke and coal .

Ans2:  Difference between coke and coal are

COKE

COAL

It is almost pure form of carbon

It mainly contains carbon.

Coke is an amorphous form of carbon

Coal is a non-crystalline form of carbon

 If we heat coal in absence of air then we can get coke.

 We get it by the process of decay of trees and plants over millions of years ago.

 

Qs3: What is the reason of being CNG as a good fuel other than petrol and diesel in vehicles?

Ans3: CNG is a good alternative to petrol and diesel in vehicles because it is a clean fuel and does not cause air pollution. It is filled in cylinders.

Qs4: What are the disadvantages of using fossil fuels?

Ans4: Disadvantages of using fossil fuel are:

  • It causes air pollution.
  • Global warming occurs as they produce greenhouse gases i.e. carbon dioxide gas on burning.
  • The by-products of burning fuels causes acid rain which pollute water resources.

EXPLAIN THE FOLLOWING ON COAL AND PETROLEUM

Qs5: According to the scientists, fossil fuel will be exhausted shortly. Why?

 Ans5:  We can get fossil fuel only for very few tears as they may exhaust very soon.  In nature we use up these in very fast rate than the consumption of other resources .They will get exhausted very soon. If the recent loading of these fossil fuels are exhausted , we cannot get any new sources of these in near future because dead organisms turn into fossil fuel in more than million years

 

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