Chemistry Combustion & Flame Part 14 (Questions) Class 8 VIII | Summary and Q&A

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November 14, 2015
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Chemistry Combustion & Flame Part 14 (Questions) Class 8 VIII

TL;DR

This video discusses the conditions necessary for combustion, different types of fuels, and how the use of CNG in automobiles has reduced pollution in cities.

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Questions & Answers

Q: What are the three necessary conditions for combustion to occur?

The three conditions are a combustible substance, oxygen, and heat. Combustion is the reaction of a substance with oxygen, releasing heat.

Q: Why does burning wood and coal cause air pollution?

Burning wood and coal release poisonous gases and smoke, leading to air pollution.

Q: How does the use of CNG in automobiles reduce pollution in cities?

CNG is a cleaner fuel, leaving less residue and producing fewer harmful gases when burned compared to petrol or diesel. This makes it more environmentally friendly.

Q: How does LPG compare to wood as a fuel?

LPG is more environmentally friendly than wood because it produces less smoke and harmful gases like carbon monoxide. It also has a higher calorific value, meaning it produces more heat energy when burned.

Summary & Key Takeaways

  • Combustion requires three conditions: a combustible substance, oxygen, and heat.

  • Burning wood and coal cause air pollution due to the release of poisonous gases and smoke.

  • CNG is a cleaner fuel compared to petrol or diesel, resulting in less residue and harmful gases when burned.

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