A chemical reaction in which a substance reacts in the presence of the air to give off heat is known as combustion. The substance that undergoes combustion is said to be an explosive substance. It is also known as a fuel. Coal, petroleum, and natural gas are examples of fuels. The fuel can be solid, liquid or gas. Sometimes, light is given during combustion, either in the form of a flame or glow.
Download Class 8 Chemistry Worksheet on Chapter 6 Combustion and Flame Set 1 PDF
CBSE Class 8 Chemistry Chapter 6 Combustion and Flame Worksheet – Set 1
Q1. The burning of LPG is a type of ________.
(a) Slow combustion
(b) Fast combustion
(c ) Spontaneous combustion
(d) None of the above
Q2. Kindling temperature is the temperature at which the substance _______.
(a) Burns
(b) Melts
(c ) Freeze
(d) None of the above
Q3. Which of the following is not an example of fossil fuel?
(a) Compressed natural gas (CNG)
(b) Liquified petroleum gas (LPG)
(c ) Natural gas
(d) None of the above
Q4. Which of the following is/are combustion products?
(a) Carbon dioxide and oxygen
(b) Carbon dioxide and water
(c ) Oxygen and water
(d) None of the above
Q5. Which of the following reaction occurs in the sun?
(a) Combustion reaction
(b) Nuclear reaction
(c ) Both (a) and (b)
(d) None of the above
Q6. Name the fuel that is used in the household.
Q7. Give two examples of combustible materials.
Q8. What are the primary necessities of combustion?
Q9. What will happen if coal is burned?
Q10. Calculate the calorific value if 60 kg of carbon is burned to liberate 1,80,000 kJ of energy?
Q11. What are the properties of good fuels?
Q12. What happens when water is heated in the paper cup?
Q13. Exemplify the composition of the matchstick head.
Q14. What do you understand by the term calorific value?
Q15. What do you understand by the term complete combustion?
Q16. Is cellular respiration identical to a combustion? If yes, then justify your answer.
Q17. Hydrogen is not used in households or industries even though it has a high calorific value. Justify this statement.
Q18. Why are some substances flammable and some are not?
Q19. What do you mean by the term explosive combustion? Give an example.
Q20. What are the dangers associated with burning fuels?
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