Combustion and flame Class 8 | Questions| Bunsen burner | CBSE #4
➡Free Notes: http://bit.ly/Class8CombustionandFlam... ➡Free NCERT solutions: http://bit.ly/Class8CombustionandFlam... ➡Complete Class 8 Science : • Class 8 Science ➡Join Telegram: https://t.me/LearnoHub6to10 ➡Ask Doubts :https://www.examfear.com/question// Timestamps: 0:00 Introduction 0:48 Brief contact with a flame does not burn 3:07 Bunsen burner Flame 7:50 How fuels release energy 8:35 Disadvantages with fossil fuels 12:23 Judicial use of energy 13:21 Question 1 14:20 Question 2 15:53 Question 3 17:27 Question 4 18:47 Question 5 20:19 Question 6 22:04 Question 7 23:20 Question 8 24:32 Question 9 25:11 Question 10 26:14 Question 11 28:01 Question 12 combustion and flame,combustion and flame class 8,class 8 science chapter 6,combustion and flame class 8 cbse,combustion and flame class 8 ncert,science class 8 chapter 6 combustion and flame,science class 8 chapter 6 revision,science class 8 chapter 6,science combustion and flame,combustion and flame class 8 science,combustion and flame class 8 exam fear,roshni mam chemistry,combustion and flame question answer class 8,combustion and flame questions The increasing fuel consumption has harmful effects on the environment. Incomplete combustion of these fuels gives carbon monoxide gas. It is a very poisonous gas. Increased concentration of carbon dioxide in the air is believed to cause global warming. In this video, we will cover: 1. List conditions under which combustion can take place. 2. 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 . 3. Explain how the use of CNG in automobiles has reduced pollution in our cities. 4. Compare LPG and wood as fuels. 5. 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 aluminum pipe does not. 6. Name the unit in which the calorific value of a fuel is expressed 7. Explain how CO2 is able to control fires. 8. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain. 9. Which zone of a flame does a goldsmith use for melting gold and silver and why? 10. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel. 11. Can the process of rusting be called combustion? Discuss. 12. 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? 13. NCERT Solutions Class 8 Science Chapter 6 14. Chapter 6 Combustion and flames class 8 Science LearnoHub.com (formerly called ExamFear Education) is a Free Education platform with more than 6000 videos on Physics, Chemistry, Maths, Biology, English, Science experiments, tips & tricks and motivational videos for Classes 6 to 12. Learn for Free! Website: http://www.learnohub.com Facebook: https://bit.ly/LearnoHubFB Instagram: https://bit.ly/LearnoHubInsta Get Our Videos in Pendrives: Class 8 - https://bit.ly/LHPenDrive8 About the Teacher: Roshni Mukherjee, the Founder-Educator at LearnoHub has been building this free learning platform since 2011. She has been recognised as one of the 100 Women Achievers of India by the Ministry of Women & Child Development and felicitated by the President of India in 2016. Roshni has been invited by Google to speak at Global Education Symposium 2017 held at Google Headquarters, California. Limca Book of Records also recognized our work. Watch Roshni's Tedx Talk to know more about her journey: • The magic passion can create | Roshni Mukh... #LearnoHubScience #CBSEClass8Sciene #SabkoSamajhAayega Join us and let us together build this Free Learning Platform! We will surely ensure that you enjoy the real learning with us. Copyright © All rights reserved. LearnoHub | ExamFear Education
