State, whether the image formed, is erect or inverted. Answer: The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). The conditions necessary for combustion to take place are as follows: Light from the lamp is reflected by the laptop screen. https://classnotes.org.in/class-8/combustion-and-flame/structure-of-flame Explain how CO2 is able to control fires. LPG is a good fuel as compared to wood as it readily available and it is cheap. Sep 13, 2020 - Worksheet : Combustion & flame Class 8 Notes | EduRev is made by best teachers of Class 8. Answer Subscribe to our Youtube Channel - https://you.tube/teachoo. Q11. Ramesh kept the beaker in the outermost part of the flame. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Sunil’s water will get heated faster than Amit’s water because outermost part of candle flame is the hottest. Measure and record the height h of the candle flame. 1. An important liquid fuel, used in home is _____. (b) A liquid fuel, used in homes … (i) On the diagram above draw a ray of light to show how George sees the light from the lamp reflected by the laptop screen. Fill in the blanks. Any three examples of gaseous fuels. Answer: The unit in which the calorific value of a fuel is expressed is kilojoules per kilogram (kJ/kg). Explain how the use of CNG in automobiles has reduced pollution in our cities. (B) LPG is a better domestic fuel than wood. Name the unit in which the calorific value of a fuel is expressed. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE- Combustion and Flame . Advertisement. Some words (underlined) in the following sentences are jumbled up. ... Ans: Candle flame: Light a candle and observe its flame. www.embibe.com. List conditions under which combustion can take place. SOLUTION: The unit of calorific value is kilojoule per kilogram (kJ/kg). It burns easily in air at a moderate rate and it produces a large amount of heat. Let us now understand the structure of flames with the context of the flames of a candle. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. 10. Whose water will get heated in a shorter time? Name the gaseous fuels. The lesson covers all important questions based on combustion and flame. Ans: The simple fire extinguisher is the soda-acid type fire extinguisher. The image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 60 cm from the optical centre of the lens. www.embibe.com. Answer: Ignition temperature is the lowest temperature at which a substance catches fire. Question 1. asked Jun 8, 2018 in Class X Science by priya12 ( -12,631 points) Any three examples of inflammable substances. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame. It consists of hot, unburnt vapours of the combustible material. Difference between types of … (C) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. Ignition temperature is different for different substances. Give reasons : For example; LPG, petrol, natural gas, etc. Which zone of a flame does a goldsmith use for melting gold and silver and why? Place the lighted candle flame in front of convex lens beyond the twice of the aproximate focal length, i.e. It does not leave behind any undesirable substances. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Explain how CO 2 is able to control fires. A candle's flame. Left: Flame on Earth; Right: Flame on the ISS. The water heated by Ramesh will get heated in a shorter time because he kept his beaker near the hottest zone of the flame. Back of Chapter Questions . Explain. Tick the correct answer : 1. (i) It produces less carbon monoxide gas. Next: NCERT Question 7→ Class 8; Chapter 6 Class 8 - Combustion And Flame; NCERT Questions. Name the unit in which the calorific value of a fuel is expressed. Due to this reason iron is not considered as combustible substance. (d) How is hydrogen gas collected? The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Light Page 7 of 8 Q10a. List conditions under which combustion can take place. Fuel may be a) Solid only b) Solid,Liquid or gas c) Liquid only d) Gas only. Class- VIII-CBSE-Science Combustion And Flame. Good fuels have a. low ignition temperature and high calorific value. The green leaves contain some water due to which the ignition temperature of leaves increases and they do not catch fire easily while dry leaves have no water so they catch fire easily. Explain how CO 2 is able to control fire. FREE Shipping by Amazon. Diagram :- Explanation :-1. Students test their explanations by experimenting with different ... Place a lighted candle inside the jar. A fuel with least calorific value. 1. (iv) No residue remain after combustion. Points to Remember: Hydrogen is the most abundant element found in the universe. What are the main constituents of biogas and kitchen gas (L.P.G.)? Answer: Extra Questions for Class 10 Science Chapter 10 Short Answer Type I. 99 $39.99 $39.99. If the height of the flame is 2.4 cm, find the height of its image. Combustion will not occur in the absence of any one of these. Ignition temperature is different for different substances. The different zones of a candle flame can be described as follows: 1. The most important compound of hydrogen is water. Answer. SOLUTION: Q 7. Living Science Solutions for Class 8 Science Chapter 6 Combustion And Flame are provided here with simple step-by-step explanations. (a) Burning of wood and coal causes’ ______of air. Why a matchstick does not catch fire on its own at room temperature? Make a labelled diagram of candle flame. Class – X . In an experiment 4.5 kg of a fuel was completely burnt. (c) Chittsmack does not burn by itself. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. Advertisement. It is easy to store and easily transported in cylinders and pipelines. (B) kerosene Attainment of ignition temperature. List conditions under which combustion can take place. Diagram of candle flame and label the parts are shown in the picture Hope this may help you. It consists of hot, unburnt vapours of the combustible material. The candle flame can have different shapes and sizes depending on the wind, temperature, etc. Use a ruler. Fire is affected by gravity. The process of rusting cannot be called combustion because in this process no heat and light is produced. Share with your friends. As it burns, record the colors, size, and shape of the candle flame. b. low ignition temperature and low calorific value. The innermost zone: The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns. (iii) Draw ray diagram to justify your answer to part (ii) ... Rohit focused the image of a candle flame on a white screen using a convex lens. Carefully observe and describe the characteristics of a candle flame. Join now. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. What is Candle Flame? Combustion and flame Worksheet-6 . Answer: (b) 3. Use a ruler. CO2 forms a blanket around the fire, cutting off the air supply, due to which the fire gets extinguished. (The lowest temperature at which a substance catches fire is called its ignition temperature). Back of Chapter Questions . Answer: Question 7. 3. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Fuel must be heated to its ____ temperature before it starts burning. Class 8. Selina Concise ICSE Solutions for Class 8 Chemistry Chapter 7 Hydrogen. NCERT Exemplar for Class 8 Science Chapter 6 Combustion and Flame 17. Presence of supporter of combustion i.e., oxygen. It is difficult to burn a heap of green leaves but dry leaves catches fire easily. Should you have any queries/clarifications please leave your details below and we will call you shortly. Calculate the calorific value of the fuel. Q2. CO2, being heavier than oxygen, covers the fire like a blanket. Class 8 - Chemistry - Combustion and Flame. Just above the blue zone is called dark zone. 011-47340170 . Introduction to candle flame concept tells about the components and structure of flame. (b) A liquid fuel, used in homes is Liquefied Petroleum Gas (LPG). All NCERT textbook questions have been solved by our expert teachers. MEDIUM. So LPG is a better domestic fuel than wood. What is the nature of the mirror? Candle of Preparation -purple3. NCERT Question 1 NCERT Question 2 NCERT Question 3 NCERT Question 4 … Combustion and Flame class 8 living science solution A. Formative and Summative Assessment 1. 1. Click here to get an answer to your question ️ Draw the diagram of candle flame and label all zones 1. EduRev is like a wikipedia just for education and the Different Zones of Candle Flame Class 8 Video | EduRev images and diagram are even better than Byjus! And to be honest, it doesn’t look bad at all! Ask your question. Goldsmith blowing through a metallic pipe. The lesson covers the complete explanation of class 8 Chapter 16 Light. (a) Burning of wood and coal causes pollution of air. Answered Water is not used to control the fire involving electrical equipment because it is a good conductor of electricity. saisathwik2 saisathwik2 18.04.2018 Chemistry Secondary School +5 pts. Tabular representation of materials which produce flames on burning is included. Dry leaves do not contain moisture, so they catch fire easily. Luminara Flameless Candle: 360 Degree Top, Vanilla Scented Moving Flame Candle with Timer (4" Ivory) 4.7 out of 5 stars 205. Name the unit in which the calorific value of a fuel is expressed. The conditions under which combustion takes place are as follows:-. The use of CNG in place of petrol and diesel reduce pollutions in following ways: Different zones of a candle flame are diagrammatically represented. What did you observe on the glass plate? 2. c. high ignition temperature and high calorific value. Explain how the use of CNG in automobiles has reduced pollution in our cities. It needs lot of space to store and also very difficult to transport. The different zones of a candle flame can be described as follows: 1. Our mission is to improve 6th to 10th outcomes for all students and make learning more intuitive, more interesting, more personalised and more affordable. Similar lights may be found on a railway platform.When urban electric power distribution became ubiquitous in developed countries in the 20th century, lights for urban streets followed, or sometimes led. ... Q22: Explain different zone of a candle flame with a diagram. Get it as soon as Fri, Nov 20. In an experiment 4.5 kg of a fuel was completely burnt. The lesson also has a look … Whose water will get heated in a shorter time? Explain how CO2 is able to control fires. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. A lilac-coloured flame is produced on heating. Light from the lamp is reflected by the laptop screen. Revisewise Education Solutions Pvt. Hydrogen is much more common in the form of compounds. Other options New from $25.39. (A) pollution EASY. Answer: Extra Questions for Class 10 Science Chapter 10 Short Answer Type I. Students can download Class 10 Science Chapter 10 Light Reflection and Refraction Important Questions, ... such as a candle flame, through a straight tube. The lesson covers the complete explanation of class 8 Chapter 16 Light. Combustion and Flame. 99 $39.99 $39.99. (a) Seldie is a combustible substance. Do check out the sample questions of Different Zones of Candle Flame Class 8 Video | EduRev for Class 8, the answers and examples explain the meaning of chapter in the best manner. (c) Fuel must be heated to its Ignition temperature before it starts burning. Difference between types of fuels has been explained. The topic is substantiated with labelled diagrams and examples. Step 3: add the details. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. The heat produced was measured to be 180,000 kJ. Photo of a fire taken with a 1/4000th of a second exposure. Lowest price in 30 days. NCERT Question 6 - Chapter 6 Class 8 - Combustion And Flame. Can the process of rusting be called combustion? (B) LPG has more calorific value than wood and LPG produces no pollution. CNG is a cleaner fuel. Light the "upright" candle and permit it to burn for one minute. CBSE NCERT Solutions for Class 8 Science Chapter 6 . $32.99 $ 32. Draw a labelled diagram of a candle flame and explain what happens in each zone. (b) A liquid fuel, used in homes is ______. The chapter begins with a short discussion on fuels and burning of materials. Determine what part of the candle is burning. (d) Fire produced by oil cannot be controlled by water. (a) Burning of wood and coal causes _________ of air. So you can be creative with how your flame looks like. 6.2 Different zones of Candle flame ... of a candle flame to melt gold and silver because it is the hottest zone and has more temperature. Name the type of nuclear reaction taking place in … Luminara Flameless Candle: 360 Degree Top, Vanilla Scented Moving Flame Candle with Timer (8" Ivory) 4.8 out of 5 stars 24. Similar lights may be found on a railway platform.When urban electric power distribution became ubiquitous in developed countries in the 20th century, lights for urban streets followed, or sometimes led. such as: - sulphur dioxide, oxides of nitrogen, and oxides of sulphur etc.in a very small amounts. For today's students, learning can happen anytime, anywhere. Form candle holders from the wire as shown in the diagram. Fill in the blanks: (a) Burning of wood and coal causes’ ______of air. But if the flame gets too little or too much air or fuel, it can flicker or flare and unburned carbon particles (soot) will escape from the flame before they can fully combust. Answer: 7. A lit candle is covered with an inverted jar in a saucer of water, the flame expires and water rises up into the jar. Other options New and used from $25.19. Class- VIII-CBSE-Science Combustion And Flame. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. View Answer. He noted down the position of the candle , screen and lens as under : Position of candle = 26.0 cm Position of convex lens = 50.0 cm Position of screen = 74.0 cm What is the focal length of the convex lens? The innermost zone: The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns. The fourth zone of the candle (sometimes call the veil) is the faint outside blue edge that extends from the blue zone at the base of the flame and up the sides of the flame cone. The wick is a solid line in the middle of the cylinder. 14. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat so paper does not attain its ignition temperature. Answer: A substance does not catch fire until its temperature is raised to its ignition temperature. (ii) It produces less carbon dioxide gas. The third candle is pinkish because it is the colour to show the anticipation of Easter. Since the contact between the fuel and oxygen is cut off, the fire is controlled. 5% off. The outermost part of the flame is the hottest one, so Rakesh’s water will get heated in a shorter time. Answer: Ignition temperature is the lowest temperature at which a substance catches fire. Class 8; Math; Science; Class 9; Class 10; Confusion Adda; Blog; Home; Class 8; Science; ... Make a labelled diagram of candle flame. Explain how CO 2 is able to control fires. MEDIUM. It has less calorific value about 17000 to 22000 kJ/Kg. A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 m from its pole. He noted down the position of the candle , screen and lens as under : Position of candle = 26.0 cm Position of convex lens = 50.0 cm Position of screen = 74.0 cm i) What is the focal length of the convex lens? NCERT solutions Class 8 Science Chapter 6 Combustion and Flame is one of the most crucial resources for Class 8 students. NCERT Solution for Science Textbook For Class 8 (2018 (Latest)) Chapter 6: Combustion and Flame Q: 6 | Page no. FREE Shipping by Amazon. Make a labelled diagram of a candle flame. 9. The heat produced was measured to be 180,000 kJ. The chief sources of hydrogen are water, acids and alkalies. Make a Labelled Diagram of a Candle Flame. Candles produce light by releasing heat and all the turn on the candle produces come from a chemical reaction known as combustion in which wax reacts with oxygen in the air to produce carbon dioxide. 51 $26.92 $26.92. It is the place where wax burns completely or complete cumbustion takes place. 3. Concept: Concept of Flame. 1. SOLUTION: Q 7. What is the difference between the burning of a candle and the burning of a fuel like coal? Find its focal length. (D) Fire produced by oil cannot be controlled by ............... . For example; LPG, petrol, […] Question 1. 8. SOLUTION: The unit of calorific value is kilojoule per kilogram (kJ/kg). Heat produced by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg. Therefore, the use of diesel and petrol as fuels in automobiles is, being replaced by CNG (Compressed Natural Gas), as CNG produces harmful products. Green leaves contain moisture, so they do not catch fire. But normally you want to bottom of the flame to start wide, and narrow down to the top. View Answer. Abida kept the beaker near the wick in the yellow part of the candle flame. Define ignition temperature of a substance. Concepts of fuel and fuel efficiency are also explained. Candle of Hope -purple2. This is a general chemistry lab which I use at the beginning of the semester to review the concept of chemical and physical change. Goldsmiths blow the outermost zone of a flame with a metallic blow-pipe for melting gold and silver. (d) Fire produced by oil cannot be controlled by _________ . ... Make a labelled diagram of a candle flame. Get it as soon as Fri, Nov 20. Discuss. 1. Define ignition temperature of a substance. (C) Fuel must be heated to its ................. ............ before it starts burning. Name the unit in which the calorific value of a fuel is expressed. Which zone of a flame does a goldsmith use for melting gold and silver and why? The unit of calorific value is kilojoule per kilogram (kJ/kg). Q.11. View Answer. Q23: Introduce a glass plate into the luminous zone of the steady candle flame and hold it for few seconds, then remove it? NCERT Question 6 - Chapter 6 Class 8 - Combustion And Flame. (A) Presence of a combustible substance. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. A matchstick, a piece of … (d) Some substances on combustion produce thea and mafel. Rusting can take place at room temperature but combustion need an ignition temperature. Textbook Solutions Balbharati Solutions NCERT Solutions RD Sharma Solutions RD Sharma Class 10 Solutions RD Sharma Class 9 Solutions Lakhmir Singh Solutions HC Verma Solutions … Explain. Class-8 » Science. Ask your question. Ramesh kept the beaker in the outermost part of the flame. Draw ray diagrams to show the nature, position and relative size of the image formed by a concave lens Total mass of fuel = 4.5 kg Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water. For this, you will need to closely observe the flames of an ordinary candle. Question 8. A street light, light pole, lamppost, street lamp, light standard or lamp standard is a raised source of light on the edge of a road or path. Draw the ray diagrams showing the image formation by … A quietly burning candle flame is a very efficient combustion machine. When the object is placed beyond 2f, then the image formed will be diminished one. Hydrogen is prepared by the action of water, acids … 3. Combustion and Flame Class 8 Science MCQs Pdf. NCERT Solutions for Class 8 Science Chapter 6 – 3 Mark Questions and Answers. Log in. It is also known as dark zone of the flame. It conducts electricity and may result electric shock. After step 2, you already have a very basic candle. Timings: 10.00 am to 7.00 pm Monday to Friday (Saturday till 2:30 pm), Explore all our videos and questions with 3 day Free trial. Selina Concise ICSE Solutions for Class 8 Chemistry Chapter 7 Hydrogen. The coldest part of candle flame. But normally you want to bottom of the flame to start wide, and narrow down to the top. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO2) is the best extinguisher. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. (c) The ray diagram will be as follows: (d) Yes, concave mirror can be used to obtain a diminished image. Class 8 Science Solved Q&A. Solution: Combustion can be defined as a process of reaction of a substance with oxygen. So you can be creative with how your flame looks like. A bright blue region near the wick is called the blue zone. A goldsmith uses the non-luminous zone (outermost zone) of candle flame to melt gold and silver because it is the hottest part of the candle flame and has most temperature. Fill in the blanks. Total heat produced = 180,000 kJ Solution: Combustion can be defined as a process of reaction of a substance with oxygen. Explain how CO 2 is able to control fire. Answer Subscribe to our Youtube Channel - https://you.tube/teachoo. Time allowed: 03 Hours Maximum Marks: 80 ... 12 Rohit focused the image of a candle flame on a white screen using a convex lens. Calculate the calorific value of the fuel. No, as rusting is a very slow process as compared to combustion and the heat evolve in combustion is much more than rusting. (B) Presence of supporter of combustion. Make a labelled diagram of a candle flame . Answer: (c) 2. (b) To get magnified image, the student should put the candle flame between fand 2f. make a well labeled diagram of a candle flame and explain it. The diagram below shows George using his laptop. Make a labelled diagram of candle flame. Q 8. Fig. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Other options New and used from $25.19. Page - 1 . Process of production of energy in sun. CBSE NCERT Solutions for Class 8 Science Chapter 6 . Practice more on Combustion And Flame. Make a labelled diagram of a candle flame. Answer. Question 1. Different zones of candle flame. Infer the products of the combustion . Explain. Can the process of rusting be called combustion? (D) water. (C) ignition temperature 2. 2. S Chand Science Class 8 Solutions Chapter 6 Combustion and Flame Lakhmir Singh Science Class 8 Chapter 6 Very Short Answer Type Questions Question 1. Practice more on Combustion And Flame. (A) Water is a good conductor of electricity. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. Page - 1 . View Answer. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Then add the wick and flame. 13. Note down the position of lighted candle (c). Name the unit in which the calorific value of a fuel is expressed. 11. The candle flame can have different shapes and sizes depending on the wind, temperature, etc. Moisture increases the ignition temperature of leaves. Ans. List conditions under which combustion can take place. $25.51 $ 25. 2. MEDIUM. Log in. Science NCERT Grade 8, Chapter 6, Combustion and Flame discusses in detail the chemical processes involved in burning and its associated concepts. In Fig will call you shortly are as follows: ( a ) burning wood! In the following sentences are jumbled up Dec 3 to store and also difficult... Its flame detail the chemical processes involved in burning and its associated concepts DAH! 1 the heat in... And explained in detail with the help of activities combustible material produced during Combustion which causes acid rain will occur. Outermost zone of a candle flame and narrow down to the top has! Flame and fuels depending on the latest exam pattern fuel as compared to Combustion and Class. Hot, unburnt vapours of the flame is the lowest temperature at which a substance with.. Https: //you.tube/teachoo the centre of curvature ( 2F ) of the flame is considered as the object AB 8... Eoy 2015 / Science / Class 7/ light Page 7 of 8.! Can have different shapes and sizes depending on the wind, temperature etc... Were doing an experiment 4.5 kg of a fuel is expressed for melting gold and and... And kitchen gas ( LPG ) resources for Class 8 Chapter 6 Combustion and flame Class 8 Science 6! Fire easily to which the calorific value of a fuel is expressed the structure of with! Heat so paper does not catch fire on its own at room temperature but Combustion need an ignition.! Basic candle Youtube Channel - https: //you.tube/teachoo ) paper by itself details! Rated by Class 8 students and has been viewed 2053 times under which Combustion takes place describe the characteristics a! Also very difficult to burn for one minute fuel used in homes is Liquefied Petroleum (! Leave your details below and we will call you shortly also very difficult to burn a of. C ) and explained in detail the chemical processes involved in burning and its holder observe and the! In burning and its associated concepts each zone, size, and shape of the candle gets extinguished the! Labelled diagram of candle flame and explain it Browse more Topics under Combustion and flame oxygen covers... A fuel is expressed oxygen, covers the complete explanation of Class 8 Solutions Chapter 6 the! A beaker lesson covers the complete explanation of Class 8 ; Chapter 6 kg of flame! The Chapter begins with a pop sound time because he kept his beaker near hottest! Chapter 10 Short answer Type Questions ( kJ/kg ) the path of rays of light when it enters with incidence. Mcqs Pdf very efficient Combustion machine when the object AB piece of … a quietly burning candle flame _____... Value about 17000 to 22000 kJ/kg cylinders and pipelines on fuels and burning of wood and causes. Since the contact between the burning of a fire taken with a 1/4000th of fuel. Viii-Cbse-Science Combustion and flame Class 8 Science Chapter 16 as per NCERT Book used in homes ______... Expressed in a unit called kilojoule per kilogram ( kJ/kg ) 6 Combustion and Flame.Topics covered Combustion! Bad at all ltd. 308, iThum Towers, A-40, Noida 201301 best NCERT Solutions Class 8 Science. The beginning of the flames of a flame with a diagram different zones a! Solved by our expert teachers as: -, is erect or.. ( iii ) it produces a large amount of heat into water which causes acid rain Central Market New! Consists of hot, unburnt vapours of the cylinder ( kJ/kg ) concepts of and! Very Short answer Type Questions of curvature ( 2F ) of convex lens as shown in blanks. ) fire produced by oil can not be controlled by water provided here with simple step-by-step explanations ) some on! Ramesh were doing an experiment in which the calorific value of fuel and fuel Efficiency are also explained beaker the. Mcq Questions for Class 8 Science MCQs Questions with Answers were prepared on! It produces less carbon dioxide gas ; Chapter 6 Class 8 Solutions Chapter 6 colors, size, and down! Take place at room temperature the weight of each candle and observe its flame you can be defined as process... Science / Class 7/ light Page 7 of 8 Q10a kJ/kg ) to start wide, and shape the... Last updated at may 26, 2020 by Teachoo the cylinder use of CNG in automobiles has reduced pollution our. Is defined and explained in detail with the help of activities through a bent tube and Flame.Topics are... Process as compared to wood as it is near the base of the combustible.... Will call you shortly kitchen gas ( L.P.G. ) topic is substantiated labelled. Rays of light when it enters with oblique incidence ( I ) from into. Of any one of the cylinder liquid only d ) fire produced by oil can not be Combustion. Pollution ( b ) a liquid fuel, used in homes is Liquefied Petroleum gas ( )... Kept his beaker near the hottest zone of the combustible substance fuel be! Its ____ temperature before it starts burning goldsmith use for melting gold and silver ordinary candle outermost... Cases it does not catch fire in front of convex lens beyond the centre of (! Important Questions based on the glass plate kept over the candle flame concept tells about the components and structure flame... Kilojoules per kilogram ( kJ/kg ) Short discussion on fuels and burning of a candle in. Convex lens as shown in the picture Hope this may help you, important Questions dioxide... ) paper by itself down the position of lighted candle ( c ) paper by.! ______Of air fire extinguisher co2 ) is the hottest one, so catch! Home is _____ it does not place the lighted candle ( c fuel. And has been viewed 2053 times during Combustion which causes acid rain the term Combustion is and... As combustible substance you already have a very small amounts Notes | EduRev is made best. And to be 180,000 kJ Question 1 NCERT Question 3 NCERT Question 1 NCERT Question NCERT. Also has a look … Make a well labeled diagram of a.... With oblique incidence ( I ) from air into water in cylinders and pipelines this is a line... Are also explained of space to store and also very difficult to burn a heap of green leaves dry! Easily whereas a piece of paper wrapped around an aluminium pipe does not candle flame diagram class 8 fire easily whereas piece! Flame looks like the use of CNG in automobiles has reduced pollution in our cities … Selina Concise Solutions. ; in troduction to fuel and fuel Efficiency ; understand the concept very well 3! As: - sulphur dioxide and nitrogen dioxide which cause acid rain very slow process as compared to wood it! Chapter 6 Combustion and the heat evolve in Combustion is much more common in the.... At which a substance does not catch fire until its temperature is raised to its ignition before! Thereafter, a detailed discussion on the ISS harm the electrical equipment step 2, already... One minute its ____ temperature before it starts burning weigh the candle flame can. Determine and record the weight of each candle and the burning of materials be kJ... The difference between the burning of wood and coal causes pollution of air is _____ Combustion. For this, you already have a very efficient Combustion machine electrical.! Concise ICSE Solutions for Class 10 Science Chapter 6 Class 8 Science Chapter 6 as per NCERT Book in... And physical change the components and structure of flame a liquid fuel, used home!, CBSE- Combustion and flame are provided here with simple step-by-step explanations much. Acids and alkalies the conditions necessary for Combustion to take place are as follows: - dioxide!: explain different zone of a fuel was completely burnt gas only by _________ outermost:.! Common in the following sentences are jumbled up and flame Lakhmir Singh Science Class 8 Chapter... Concise ICSE Solutions for Class 8 Science with Answers to help students understand the structure of flame mentioned. Have A. low ignition temperature is the hottest zone ( complete Combustion place. Leaves catches fire control the fire is called dark zone of the.... Causes formation of unburnt carbon particles along with CO gas fuel = 40,000 kJ/kg wick in outermost...

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