The advantages of using compressed natural gas (CNG) and liquefied petroleum gas (LPG) as fuels are:
· They can be directly burnt.
· They can be easily transported through pipe lines.
· They do not give smoke when burnt. They are clean fuels.
· When burnt they give a lot of heat energy.
Bitumen is a petroleum product that is used for road surfacing.
Millions of years ago due to various natural phenomenon such as storms, floods and earthquakes, dense forests got buried under the soil. As time passed, natural phenomenon such as high winds, cyclones, etc. deposited more and more soil over these buried forests. As a result, these forests were further compressed and also subjected to high pressure and temperatures emanating from deep within the earth/soil. Under these conditions, these forests slowly and slowly carbonized and converted to coal. This slow process of forming coal from dead vegetation is known as carbonization.
in the banks.
(a) Fossil fuels are ________, ________and _________.
(b) Process of separation of different constituents from petroleum is called
(c) Least polluting fuel for vehicles is __________.
a) Fossil fuels are coal, petroleum and natural gas.
b) Process of separation of different constituents from petroleum is called refining.
c) Least polluting fuel for vehicles is CNG.
Fossil fuels are formed from dead vegetation and animals that undergo a slow process of carbonization deep inside the Earth’s soil under high pressure and temperature. This process takes millions of years. Scientists have not been able to replicate the same environment for carbonization in the laboratories. Therefore, fossil fuels take a long time to form and always available in limited quantity.
The utilization of these fossil fuel when compared to the speed formation is much faster. This leads us to realize that fossil fuels are exhaustible natural resources.
Characteristics of coke:
· Black in colour
Uses of coke:
· In manufacturing of steel.
· In Extraction of metals (as a reducing agent).
Dead organisms that got buried in the sea millions of years ago got covered with layers of sand and clay. Lack of air, high temperature, and high pressure transformed these dead organisms into petroleum and natural gas.