The substances which give heat and light after combustion are calleda)flameb)fuelc)combustiond)none of these.Correct answer is option 'B'. Can you explain this answer?

Question

Answer

Fuel is the substance this gives both the things.

Answer

Combustion is the scientific word for burning. In a combustion reaction a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat.

Answer

The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.
So, the correct option is 'B' FUEL.

Answer

Flame is the right answer

Answer

Correct answer
B

Answer

A chemical process in which a substance reacts with the oxygen to give heat and light is called combustion. The light which is given off during combustion can be in the form of flame or as a glow. The substance which undergoes combustion is said to be combustible.It is called fuel.

Answer

The substances which give heat and light after combustion are called fuels.

Explanation:
When a substance undergoes combustion, it reacts with oxygen to produce heat and light energy. The substances that are capable of undergoing combustion and releasing heat and light energy are known as fuels.

Characteristics of Fuels:
Fuels possess certain characteristics that make them suitable for combustion and energy production. Some key characteristics of fuels are:

1. Chemical Composition: Fuels are composed of carbon and hydrogen primarily, although other elements may be present as well. The presence of carbon and hydrogen allows for the release of energy during combustion.

2. High Energy Content: Fuels have a high energy content due to the presence of carbon-hydrogen bonds. When these bonds are broken during combustion, a significant amount of energy is released in the form of heat and light.

3. Combustibility: Fuels are highly combustible, meaning they can easily undergo combustion when exposed to a source of ignition and sufficient oxygen supply.

4. Stability: Fuels should be stable at normal conditions to prevent accidental combustion. They should not undergo spontaneous combustion or react with air or moisture.

5. Availability: Fuels should be readily available in sufficient quantities to meet energy demands. Common examples of fuels include coal, oil, natural gas, wood, and biomass.

Importance of Fuels:
Fuels play a crucial role in various aspects of human life, including:

1. Energy Production: Fuels are the primary source of energy for various applications such as electricity generation, heating, cooking, and transportation.

2. Industrial Processes: Many industrial processes rely on the use of fuels for heat and energy, including manufacturing, refining, and chemical reactions.

3. Agriculture and Cooking: Fuels like wood, charcoal, and biomass are used for cooking and heating in many rural areas where other energy sources may be limited.

4. Transportation: Fuels such as gasoline, diesel, and aviation fuel are essential for powering vehicles, airplanes, and ships.

In conclusion, fuels are substances that release heat and light energy when they undergo combustion. They are characterized by their chemical composition, energy content, combustibility, stability, and availability. Fuels are of paramount importance in various aspects of human life, providing the energy required for daily activities and industrial processes.

Top Courses for Class 8View all

Science Class 8

Mathematics (Maths) Class 8

Social Studies (SST) Class 8

English Class 8

Cursive Writing Course-Improve Your Handwriting

Top Courses for Class 8

Top Courses for Class 8

Suggested Free Tests

Related Content

Class 8 Study Material

Class 8 Subjects

Competitive Examinations for Class 8

NCERT Solutions

Reference Books for Class 8

Other Popular Exams

Company