Combustion and Flame - Class 8 Science - Chapter 4 - Notes, NCERT Solutions & Extra Questions
Renews every month. Cancel anytime
Your personal doubt-solving assistant
Chatterbot AI gives you 100% accurate answers to your questions in an instant.
Notes - Combustion and Flame | Class 8 NCERT | Science
Combustion and Flame Class 8 Notes: A Comprehensive Guide
Understanding the principles of combustion and flame is crucial for various practical applications and for ensuring safety in daily activities. This guide covers everything you need to know on the topic, tailored specifically for Class 8 students.
Introduction to Combustion
Combustion is a chemical process in which a substance reacts with oxygen to release heat and light. The substances that undergo combustion are termed as fuels. There are various types of fuels including solids like wood and coal, liquids like petrol and kerosene, and gases like natural gas...
We've got so much more in store, just for you! 🤩
Sign up to unlock Notes and everything else
Unlock now 🔓🚀 Learn more about Notes with Chatterbot AI
Notes - Flashcards - Combustion and Flame | Class 8 NCERT | Science
Back Questions - Combustion and Flame | NCERT | Science | Class 8
List conditions under which combustion can take place.
Combustion can take place under the following conditions:
1. Presence of a Fuel: The substance that undergoes combustion is known as fuel. This can be solid, liquid, or gas. Examples are wood, petrol, coal, etc.
2. Supply of Air/Oxygen: For combustion to occur, oxygen is necessary. In most cases, the oxygen is obtained from the air.
3. Ignition Temperature: This is the lowest temperature at which a substance catches fire. The fuel must be heated to its ignition temperature for combustion to begin.
4. Heat Source: At least one source of heat is needed to maintain the reaction. This source can be a lit match, a hot plate, sunlight, or another source of heat that has the capability to raise the temperature of the fuel to its ignition temperature.
5. Sustained chemical chain reaction: Once the necessary temperature is reached and combustion begins, a chain reaction takes place that allows the process to continue as long as fuel and oxygen are available.
When all these conditions are met, combustion can take place.
Fill in the blanks.
(a) Burning of wood and coal causes _________ of air.
(b) A liquid fuel, used in homes is _________ .
(c) Fuel must be heated to its _________ _________ before it starts burning.
(d) Fire produced by oil cannot be controlled by _________ .
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Explain how the use of CNG in automobiles has reduced pollution in our cities.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Compare LPG and wood as fuels.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Give reasons.
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily, whereas a piece of paper wrapped around an aluminium pipe does not.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Make a labelled diagram of a candle flame.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Name the unit in which the calorific value of a fuel is expressed.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Explain how CO2 is able to control fires.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
It is difficult to burn a heap of green leaves, but dry leaves catch fire easily. Explain.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Which zone of a flame does a goldsmith use for melting gold and silver, and why?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
In an experiment, 4.5 kg of fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Can the process of rusting be called combustion? Discuss.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AILong Questions - Combustion and Flame | NCERT | Science | Class 8
Can you explain the role of air in the process of combustion? Why is it essential?
In the process of combustion, air plays a pivotal role as it supplies the necessary oxygen for the process to occur. Combustible substances burn in air and produce heat and light. Without air, the flame from combustion processes will flicker and smokes, and eventually the flame will go off, indicating that combustion cannot occur without air. Hence, air is necessary for combustion. Air supplies the necessary oxygen which reacts with the fuel or combustible materials to produce flames, heat, and light. Consequently, the role of air is essential and has a significant effect on the burning process.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Why are diesel and petrol being replaced by CNG (Compressed Natural Gas)? What benefits does CNG provide?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Why do we have fireworks on festival days and what reaction takes place during this?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIShort Questions - Combustion and Flame | NCERT | Science | Class 8
Why does water in a paper cup not burn when heated with a flame?
Water in a paper cup does not burn when heated with a flame because the heat supplied to the paper cup is transferred to the water through conduction. This keeps the temperature of the paper below its ignition point (the temperature at which it would burn). Therefore, the paper doesn't reach the necessary high temperature required to burn because the water inside the cup absorbs all the heat.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
According to their calorific values, rank the following fuels in order: wood, coal, LPG.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
What is the impact of the emission of sulphur dioxide gas from the burning of coal and diesel?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
In what ways do combustion and flame contribute to our daily lives?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIExtra Questions - Combustion and Flame | NCERT | Science | Class 8
Industrially, hydrogen is prepared by passing hydrogen gas over red-hot coke at high temperature.
In industrial processes, hydrogen is produced by passing steam (not hydrogen gas, as mentioned in the question) over red-hot coke at a high temperature. This process results in the formation of carbon monoxide (CO) and hydrogen gas (H₂) as the primary products. The chemical reaction involved is represented by:
$$ \mathrm{C} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{CO} + \mathrm{H}_2 $$
This reaction is also exothermic, releasing heat during the process.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
0.1 moles of ethane gas $\left(\mathrm{C}{2}\mathrm{H}{6}\right)$ and 0.3 moles of oxygen gas are sealed in a flask at $27^{\circ}\mathrm{C}$ and $1.0~\mathrm{atm}$ pressure. The flask is heated to $1000~\mathrm{K}$ and only the following reaction takes place: $$ \mathrm{C}{2}\mathrm{H}{6}+\frac{5}{2}\mathrm{O}{2} \rightarrow 2\mathrm{CO}+3\mathrm{H}{2}\mathrm{O} $$
Calculate the partial pressure of the products of the reaction in the reaction mixture.
A $4.58~\mathrm{atm}$
B $4.17~\mathrm{atm}$
C $2.08~\mathrm{atm}$
D $0.27~\mathrm{atm}$
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
How is spontaneous combustion different from rapid combustion? Explain the difference in detail. [5 MARKS]
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Cotton or natural cellulose burns with smoke and leaves residue.
A. True
B. False
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AI