Uses of Fuel

1.Keeping a Burning Coal Sigri Out of the Room While Sleeping Is Suggested. What Do You Think Is the Reason Behind It?

• Burning coal produced the gas carbon monoxide.
• This gas can lead to death if the room is not ventilated properly.

2.Keeping a Burning Coal Sigri Out of the Room While Sleeping Is Suggested. What Do You Think Is the Reason Behind It?

The fuels found in a solid state at room temperature are called solid fuels.

Example: Wood, charcoal, cow dung.

3.State the Disadvantages of Using Solid Fuels.

The disadvantages of solid fuels are as follows:

• High ignition temperature.
• Production of ash.
• Difficult to store and transport.
• Prone to weather conditions.

4.State the Disadvantages of Using Liquid Fuels.

• The disadvantages of liquid fuels are as follows:
• They are costly.
• They are highly combustible; hence there are risks of fire hazards.
• They cannot be used without using specific equipment.
• 

5.Why Rubbing Matchstick on a Rough Surface Leads to Its Burning?

• The rubbing of a matchstick on a rough surface leads to heat production.
• This heat is sufficient to reach the ignition temperature required for burning the chemical on the tip of the matchstick, and it starts burning.

6.What Is Fractional Distillation? Why Is Fractional Distillation Used to Purify Petroleum?

• The method of purifying a liquid mixture of components with different boiling points is called fractional distillation.
• The contents of the petroleum have different boiling points.
• They evaporate at different temperatures; hence they can be collected or separated by fractional distillation.

7.Why Should Firewood Not Be Used as Fuel Regularly?

• Firewood is a solid fuel.
• It does not have an optimum ignition temperature and produces a large amount of carbon dioxide.
• The smoke produced is also harmful to the eyes and may damage them in the long run.

8.What Is Nuclear Fuel? Why Is It Used Only Under Specific Circumstances? Can It Be Used in Daily Life?

• Reactive elements like uranium and thorium are used to produce energy on a large scale and are called nuclear fuels.
• These fuels cannot be used in daily life as they produce enormous amounts of energy.
• Moreover, they require specific conditions and instruments for the production of energy.

9.What Are Fossil Fuels? Why Are They Called So?

• The fuels obtained from dead and decayed remains of plants and animals are called fossil fuels.
• Coal is obtained from plants' remains, whereas animal remains are converted into petroleum.
• They are called so because they are obtained from fossils.

10.Why Is Liquid Hydrogen Used As Rocket Fuel?

Liquid hydrogen is used as rocket fuel as it is light weighted and produces large amounts of energy.