• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar

Class Notes

Free Education for All

  • Class 1-5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12
  • NCERT Solutions
    • NCERT Books
You are here: Home / Class 8 / Combustion and Flame / Combustion

Combustion

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment

Question 1Define the term combustion?

Question 2 What are fuels.Name 2 fuels?

Question 3 What are combustible substances.Give example?

Question 4 What are non-combustible substances.Give example?

Question 5 Can the process of rusting of iron be called combustion.Give reason for answer?

Question 6 What happens when combustion of magnesium takes place?

Question 7 What happens when combustion of charcoal take place?

Question 8 Respiration is a slow combustion.Explain?

Combustion

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.

1)Combustion of Magnesium

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.

Magnesium + Oxygen ———> Magnesium oxide + heat +Light

The burning of magnesium in air to produce heat and light is a combustion process.Magnesium is a combustible substance.

2) Combustion of Charcoal

When charcoal burns,then the carbon of charcoal combines with the oxygen of air to form carbon dioxide.A lot of heat is produced in the combustion reaction but only a little light is produced.

Carbon + oxygen ———> Carbon dioxide + heat +light

(Charcoal)

Oxygen is necessary for combustion to take place.It is a supporter of combustion.

Food is a fuel for our body.During respiration,the digested food is broken down by the reaction with oxygen in the body cells to produce carbon dioxide,water and heat energy.This heat energy is utilised by our body.Respiration is a kind of slow combustion of food which take place in the body to produce heat energy.

The rust is formed when iron slowly combines with the oxygen present in air to form iron oxide.The process of rusting of iron is an example of slow combustion.

The sun produce heat and light .In the sun,heat and light are produced due to nuclear reactions.

Combustible substances

Those substances which can burn are called combustible substances.

For Ex:Cloth,straw, cooking gas, kerosene oil, wood, coal,charcoal etc.

A combustible substance is called as fuel.

Non-combustible substances

Those substances which do not burn are called non-combustible substances.

For Ex:Stone,cement,glass,bricks,soil,sand,water,iron nails,copper objects.

Filed Under: Combustion and Flame, Class 8 Tagged With: combustible substance, combustion, combustion of charcoal, combustion of magnesium, non-combustible substance, oxygen is supporter of combustion

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Recent Posts

  • Chapter 10 The Beggar
  • Chapter 8 A House is Not a Home
  • Chapter 7 The Last Leaf
  • Chapter 6 Weathering the Storm in Ersama
  • Chapter 5 The Happy Prince
  • Chapter 4 In the Kingdom of Fools
  • Email
  • Facebook
  • Pinterest
  • RSS
  • Twitter

Copyright © 2022 · About Us · Contact Us · Privacy Policy