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Combustion and Flame

Gujarat Board · Class 8 · Science

Quick revision notes for Combustion and Flame — Gujarat Board Class 8 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions5 concepts

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Key Topics to Revise

1

What is Combustion?

  • Combustion is a chemical process in which a substance reacts with oxygen to produce heat, and often light.
  • The substance that undergoes combustion is called a combustible substance or fuel.
  • Fuels can be solid (wood, coal, charcoal), liquid (kerosene, petrol, diesel), or gas (LPG, CNG, natural gas).
2

Ignition Temperature and Conditions for Combustion

  • Every combustible substance has a specific ignition temperature – the minimum temperature needed for it to catch fire.
  • A matchstick does not catch fire on its own because room temperature is below its ignition temperature.
  • Rubbing a matchstick on the rough surface of a matchbox produces friction heat, raising the temperature above ignition temperature, causing it to burn.
3

How Do We Control Fire?

  • Fire can be controlled by removing any one of the three requirements: fuel, oxygen, or heat.
  • Water is the most common fire extinguisher – it cools the burning material below its ignition temperature AND water vapour cuts off oxygen supply.
  • Water CANNOT be used for: (1) Electrical equipment fires (water conducts electricity – dangerous), (2) Oil/petrol fires (water is heavier than oil, sinks below, oil keeps burning on top).
4

Types of Combustion

  • There are three main types of combustion: Rapid Combustion, Spontaneous Combustion, and Explosion.
  • RAPID COMBUSTION: The substance burns rapidly, producing heat and light. Example: LPG burning in a gas stove, burning of a matchstick.
  • SPONTANEOUS COMBUSTION: A material suddenly bursts into flames WITHOUT any apparent external cause (no matchstick or flame applied). Example: Phosphorus burns in air at room temperature.

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Full Notes

Key Concepts

Combustion is a chemical processIgnition temperature is the lowest temperatureInflammable substances are materials that haveFor combustion to occurThere are three main types

Frequently Asked Questions

What are the important topics in Combustion and Flame for Gujarat Board Class 8 Science?
Key topics in Combustion and Flame include Combustion and Flame – Chapter Overview Mind Map, Combustion and Flame Concept Overview, Combustion and Flame — Complete Chapter Overview. These are the concepts Gujarat Board Class 8 examiners draw on most — study them first, then practise related questions.
How to score full marks in Combustion and Flame — Gujarat Board Class 8 Science?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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