Question 13. The substances which give heat and light after combustion are called. Coal is also used in industries. Burning of natural fuels like wood, coal, fossil fuels, release unburnt carbon particles in the air, called smoke. The substances which vapourise during burning, give … Many things, such as magnesium, catch fire when heated in air, and burn with a sparkling white flame. Question 1. The fuel may be solid, liquid or gas. Combustion is a _____ chemical reaction: Hope the given MCQ Questions will help you in cracking exams with good marks. 1. Q 22 - Which of the following burns with flame: (a) coal. A fire extinguisher is a device to control uncontrolled fire. In many rural parts of our country people still use wood as a fuel because of its easy availability and low cost. In the most common type of flame, hydrocarbon flames, the most important factor determining color is oxygen supply and the extent of fuel-oxygen pre-mixing, which determines the rate of . Fill in the blanks. And Vice versa. Like fossil fuel, biogas, etc. Found insideThe target audience for this book includes engineers involved in combustion system design, operational planning and maintenance. Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen.When fuel and oxygen react it releases the heat and light energy. (a) 18. Ignition temperature is maintained (it is defined as the substance that catches fire at its lowest temperature). This book provides an introduction to understanding combustion, the burning of a substance that produces heat and often light, in microgravity environments-i.e., environments with very low gravity such as outer space. Do all materials bum? Heat and light … Question 14. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Answer: The fuel can be in the form of solid, liquid, or gas. Track your paper. Combustion and flame. (d) all of these. But when it does, the flames are an indicator of the reaction. Ans. NCERT CAREER. Combustion and Flame Class 8 Science NCERT Textbook Questions. Incomplete combustion of gaseous fuel (like acetylene, propylene, propane, natural gas, etc.) You will need a pair of tongs, some metal or clay dishes and a candle or a spirit lamp. It is the brighter part of the flame and occurs as a result of partial combustion of fuel. Combustion is a chemical process in which a substance (fuel) burns in the presence of air (oxygen) with the release of heat and light. Related to Chapter 6 Combustion and Flame.? Any material pr substance that undergoes combustion is known as combustible substance. (A-t-A). Choose the correct option. It is an oxidation process because it involves the burning of a fuel, completely or partially in the presence of air. Complete combustion of a fuel yields a high amount of energy whereas incomplete combustion yields a less amount of energy. Fuels are of two types- Natural and Artificial depending upon the source. We use cookies to help provide and enhance our service and tailor content and ads. Combustion: It is a process in which a substance chemically reacts with oxygen resulting in the generation of heat and light in the form of a flame. Q2) list three types of combustion. CBSE Class 8 Science Chapter 6 Combustion and Flame Extra Questions will help you to properly understand a particular concept of the chapter. Answer: Combustion can take … During the combustion, light is also given off either in the form of a flame or as a glow. The physical state of the fuel may vary. Name one unit in which the heat liberated by a fuel is measured. Question 12. Moreover, it is a result of complete combustion and is blue in colour. Found inside – Page iMost of the material covered in this book deals with the fundamentals of chemistry and physics of key processes and fundamental mechanisms for various combustion and combustion related phenomena in gaseous combustible mixture. Which means that they easily catch fire with a flame. The Middle Zone - This zone is moderately hot and yellow in colour. For combustion to produce a flame, both the combustible substance and the supporter of combustion must be gases. The substance that undergoes combustion is said to be combustible. Combustion and Flame: One of the milestones in the history of civilization was the invention of fire. (c) candle. It is the least hot zone of the flame. Combustion is defined as a rapid exothermic reaction that liberates substantial energy as heat and flames as combustion reactions with the ability to propagate … Ans: Candle, wood and paper are examples of some substances which burn with a flame. This new addition to the MP sustainable energy series will provide the most up-to-date research on tubular combustion--some of it only now coming out of private proprietary protection. Fuel or Combustible Substance:Any material that undergoes combustion is called a combustible substance. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. Define and classify combustion and combustible substance and differentiate between burning and combustion and demonstrate them; State rapid combustion, spontaneous combustion, explosion with examples; Define ignition temperature and inflammable substance; Explain fire triangle In such a type of combustion, the substance catches fire on its own. A chemical process in which a substance reacts with oxygen to give off heat terms as combustion. The outermost zone of the flame is non-luminous, which means it doesnât produce light. Burning of fuel also releases carbon dioxide which is a major greenhouse gas and raises the global temperature leading to a phenomenon called global warming. Moreover, the book gives the reader sufficient background of basic engineering sciences such as chemistry, thermodynamics, heat transfer and fluid mechanics. This zone is moderately hot and yellow in colour. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field. ii. The candle continues to burn for some time. Answer: Combustion can take place in the presence of: (a) a combustible substance. Combustion is a redox chemical reaction that takes place between fuel and an oxidant to give a mixture of gases and heat and light. When solid unburnt particles from the combustion of a substance get dispersed in air, they generate smoke. Heat b. light c. Sound d. All of these Ans.18. The autoignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. Found insideLakhmir Singh s Science is a series of books which conforms to the NCERT syllabus. The main aim of writing this series is to help students understand difficult scientific concepts in a simple manner in easy language. Spontaneous Combustion - It is spontaneous and occurs without the application of heat. When gas burns, it produces heat and light b. So, by controlling one of these factors, fire can be controlled. Incomplete combustion, the reactants get oxidized or burn in oxygen to give a limited number of byproducts. Effici. Combustion: Combustion may or may not form light as an energy form. Q. Likewise, when a piece of paper is brought near a burning candle, it burns, creating heat and light. Combustion and Flame. Found insideLean burning of premixed gases is considered to be a promising combustion technology for future clean and highly efficient gas turbine combustors. Rapid combustion is a. 10.The ____ zone in a candle flame is the zone of no combustion. How Does the Burning of Fuel Give Rise to Pollution? On heating, the red phosphorus turns into white phosphorus. Select the correct answer and click on the “Finish” buttonCheck your score and answers at the end of the quiz, Visit BYJU’S for all Chemistry related queries and study materials, Your Mobile number and Email id will not be published. Complete combustion is very important in industrial scale applications. Question 13. Incomplete combustion of fuel releases many poisonous gases such as carbon monoxide. The substance that undergoes combustion is called as combustible or fuel. A flame or heat source is present to bring the temperature to the ignition temperature of the fuel. Moreover, petrol engines give off gaseous oxides of nitrogen. The fuel may be in solid, liquid or gas state. (b) cow dung. The lower the ignition temperature the better the fuel. What is the meaning of combustion and flame? Soln: The … Refer to the Combustion and Flame Class 8 MCQs Questions with Answers here along with a detailed explanation. The flame is the glowing gaseous part of the fire. An overview of combustion science for a scientifically literate audience new to the field. Liquid Fuels – Examples are kerosene and petrol. Combustion and Flame. 1. Get NCERT Solutions, Notes and Worksheets of Chapter 6 Class 8 Science - Combustion and Flame at teachoo. Combustion is the chemical process in which a substance reacts with oxygen to give off heat. (b) Air (Oxygen). CNG is used to run automobiles. Using tongs, pick up a small piece of paper and bring it near to the lighted candle and keep it on flame as shown in figure. It is also called a fuel. Found insideThis book presents basic information about combustion, mostly in the form of examples. It is a textbook for a one-semester or one-quarter course for juniors or seniors in mechanical, aerospace, chemical, or civil engineering. Which of the following has the characteristics of a good fuel? Fuel must be heated to its ignition temperature before it starts burning. 22. The calorific value of. Found insideTherefore, the target audience for it involves design, analyst, materials and maintenance engineers. Also manufacturers, researchers and scientists will benefit from the timely and accurate information provided in this volume. Answer. Difference between types of fuels has been explained. Guide for authors. Which means, if the calorific value is high for fuel, its efficiency is also high. That is, it may be solid, liquid or gas. 13. However, the presence of oxygen is not must for oxidation to take place. White phosphorus ignites spontaneously and increases the temperature of the wooden stick which is also an easily combustible substance. Answer: Those substances which provide energy on burning are called 'fuels'; e.g., coal, petroleum, LPG, etc. He found out that the heat produced by complete combustion of 2 kg of W, 4 kg of X, 1.2 kg of Y, and 3.2 kg of Z is 110000 kJ, 100000 kJ, 72000 kJ, and 12800 kJ respectively. In combustion and flame we come to know that the substance that … Found insideDesigned for chemical engineers and other technical personnel involved in the design, operation, and maintenance of facilities and equipment where deflagration and detonation flame arresters (DDFAs) may be required, this book fosters ... What is flame? Combustion efficiency is a term that sometimes refers to ensuring that you burn the fuel completely and convert all the fuel reactants to final combustion product (CO2, H2O). The text then elaborates on the reaction between hydrocarbons and oxygen and combustion waves in laminar flow. The manuscript tackles combustion waves in turbulent flow and air entrainment and burning of jets of fuel gases. Question 1. The Innermost Zone - It is the least hot zone of the flame. Oxidizing flame is obtained when excess oxygen than that is required for stoichiometrically complete combustion is supplied. When not, enough oxygen is available for the continuation of chemical reaction or burning of elements in oxygen, it produces more by products. Why some substances burn with a flame while as some burn without a flame? Combustion is a chemical process in which a substance reacts with oxygen to give off heat. 11. Explosion is the evolution of a. Actually, combustion is a result of dynamic or time dependent events that occur on a molecular level among atoms, molecules, radicals and solid boundaries. You in cracking exams with good marks 8 Chemistry combustion and flame Class 8 Science Chapter 6 8... 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Molecule of hydrocarbon burns in oxygen, that is required to supply the energy...
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