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What is Coal (chemistry)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
Coal is a black or brownish-black rock that can be burned for energy. It is a fossil fuel formed from the remains of plants that lived millions of years ago, buried deep under the Earth's surface.
Simple Example
Quick Example
Imagine you see a train running on a railway track. Many older trains, especially freight trains in some parts of India, used to run by burning coal to produce steam, which then moved the engine. Just like how wood burns to give heat for cooking, coal burns to give a lot more heat and power.
Worked Example
Step-by-Step
Let's understand how coal is formed over millions of years.
Step 1: Huge forests and swamps existed on Earth millions of years ago.
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Step 2: When these plants died, they fell into the swampy water and did not decay completely due to lack of oxygen.
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Step 3: Over time, more and more layers of soil and rocks covered these decaying plants, burying them deeper and deeper.
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Step 4: The immense pressure from the layers above and the heat from inside the Earth slowly changed these plant remains into a dark, solid material.
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Step 5: This slow process, called carbonisation, took millions of years.
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Step 6: The final product of this long process is coal, a rich source of carbon and energy.
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Answer: Coal is formed from ancient plant matter under high pressure and heat over millions of years.
Why It Matters
Understanding coal is crucial for understanding energy production and climate change. Chemical engineers work on making coal burning cleaner, while scientists in climate change research study its environmental impact. This knowledge is key for developing sustainable energy solutions for our future.
Common Mistakes
MISTAKE: Thinking coal is made from dead animals. | CORRECTION: Coal is primarily formed from dead plants, not animals.
MISTAKE: Believing coal forms quickly in a few years. | CORRECTION: Coal formation is a very slow process that takes millions of years under specific geological conditions.
MISTAKE: Confusing coal with charcoal. | CORRECTION: Coal is a natural fossil fuel found underground, while charcoal is made by burning wood in a limited oxygen supply.
Practice Questions
Try It Yourself
QUESTION: Is coal a renewable or non-renewable resource? | ANSWER: Non-renewable.
QUESTION: What is the main element found in coal that makes it a good fuel? | ANSWER: Carbon.
QUESTION: If a power plant uses 1000 kg of coal to generate electricity, what is the primary purpose of burning this coal? | ANSWER: To produce heat energy, which is then converted into electrical energy.
MCQ
Quick Quiz
Which of the following describes the origin of coal?
Formed from molten rock (lava)
Formed from dead marine animals
Formed from ancient plant remains
Synthetically created in laboratories
The Correct Answer Is:
C
Coal is a fossil fuel formed from the decomposition of ancient plant matter over millions of years under high pressure and heat. Options A, B, and D are incorrect as they describe different geological processes or origins.
Real World Connection
In the Real World
In India, coal is a major source of energy. Many thermal power plants across the country, like the ones near cities such as Korba or Singrauli, burn coal to generate electricity that lights up our homes, runs our fans, and charges our phones. This electricity is then distributed through the national grid to cities and villages.
Key Vocabulary
Key Terms
FOSSIL FUEL: Fuels formed from the remains of ancient organisms | CARBONISATION: The slow process by which dead plants are converted into coal | NON-RENEWABLE: A resource that cannot be easily replaced once used up | THERMAL POWER PLANT: A power station where heat energy is converted into electricity
What's Next
What to Learn Next
Great job learning about coal! Next, you should explore 'What are other types of fossil fuels?' like petroleum and natural gas. This will help you understand different energy sources and their importance in our daily lives.
