Combustion is a chemical reaction in which a material reacts in the presence of oxygen to liberate heat or light. Sometimes, light is given during combustion, either in the form of a flame or glow. A material that undergoes combustion is referred to as an explosive substance. Natural gas, petroleum and coal are some examples of naturally occurring combustible materials.
Download Class 8 Chemistry Worksheet on Chapter 6 Combustion and Flame Set 2 PDF
CBSE Class 8 Chemistry Chapter 6 Combustion and Flame Worksheet – Set 2
Q1. Which of the following gas promotes combustion?
(a) Carbon dioxide
(b) Hydrogen
(c ) Oxygen
(d) All of the above
Q2. What is the abbreviation of LPG?
(a) Liquified Petroleum Gas
(b) Liquid Petroleum Gas
(c ) Both (a) and (b)
(d) None of the above
Q3. CNG is an example of a
(a) Liquid fuel
(b) Solid fuel
(c ) Gaseous fuel
(d) None of the above
Q4. Which of the following is an explosive substance?
(a) Coal
(b) Glass
(c ) Stone piece
(d) All of the above
Q5. Which of the following is used as a fire extinguisher?
(a) Nitrogen dioxide
(b) Oxygen
(c ) Carbon dioxide
(d) None of the above
Q6. Name a commonly used fire extinguisher.
Q7. Name any two non-combustible materials.
Q8. What will happen if magnesium is burned?
Q9. What is combustion? Give an example.
Q10. What do you understand by the term rapid combustion?
Q11. What is calorific value? How is it related to the efficiency of combustion?
Q12. What is global warming?
Q13. How many moles of methane are required to produce 22 g of carbon dioxide (g) after combustion?
Q14. Draw a labelled diagram of a candle flame and explain what happens in each zone.
Q15. What is the primary difference between combustion and flame?
Q16. Why do we cover a blanket on fire to extinguish it?
Q17. What happens when phosphorous is kept at room temperature? What is the name of the process involved?
Q18. What happens when water is poured into the fire?
Q19. What are the causes of global warming?
Q20. How is burning wood harmful?
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