Combustion is a chemical reaction that releases heat and light energy. It requires a fuel, oxygen from air, and temperatures above the fuel's ignition point. Different fuels include solids like wood and coal, liquids like petrol and diesel, and gases like natural gas. Combustion produces flames when fuels vaporize during burning. A flame has different temperature zones, with the outer zone being the hottest. Fuels are evaluated based on their calorific value, or heat produced per unit mass. While combustion provides energy, incomplete burning of fuels pollutes the air with carbon monoxide and particulate matter.
The document defines combustion as the chemical process where a substance reacts with oxygen to produce heat. It requires three conditions: a fuel, oxygen from air, and heat. Combustible substances that burn are called fuels. Combustion can be spontaneous or explosive. Fire is controlled by methods like using water or carbon dioxide to cut off the oxygen supply or reduce heat. A flame zone forms when fuels vaporize during burning and has inner, middle, and outer zones of different temperatures and colors.
The document discusses combustion and different types of fuels. It defines combustion as a chemical reaction between a substance and oxygen that produces heat. Fuels can be solid, liquid or gas. Examples of different fuels are provided. The document also discusses flame, ignition temperature, fire extinguishers, types of combustion like rapid, spontaneous and slow combustion. It provides information on calorific values of different fuels and environmental disadvantages of fuel combustion.
Presentation on gravitation for class 9th Rahul Shukla
It contains a brief description of gravitation with a video.
This presentation is with a deginer font and a classic theme.
It also consist a beautiful song
COMBUSTION AND FLAME PPT- SHORT NOTES/CLASS8/SCIENCE/CHEMISTRYRidhima Wahi
This is a PPT on the chapter- Combustion and Flame, of class 8.
The PowerPoint presentation will help you get an outline of the chapter, and also help create short notes (for revision)
I hope that would be something of your benefit. :)
CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE Gaurav Ghankhede
SCIENCECLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE GHANKHEDE
Sir Isaac Newton was an English mathematician, astronomer, physicist, and natural philosopher. He was born in 1643 in Lincolnshire, England and was educated at The King's School and Trinity College, where he studied mathematics and astronomy. During his private studies in the 1660s, Newton developed the foundations of calculus and made discoveries in optics and mechanics that helped lay the foundations of classical mechanics. He formulated Newton's laws of motion and universal gravitation, which dominated the scientific view of the physical universe for the next three centuries.
Transport,communication and trade for class 8LearnX365
This document discusses various modes of transportation and communication in India, including roadways, railways, pipelines, waterways, airways, and means of mass communication. It notes that transportation helps transfer technology, link traders, transport people and goods, defend the country, and shorten distances. Railways are described as having problems like old tracks, passengers without tickets, pulling emergency chains unnecessarily, and facing competition from airways. Pipelines are highlighted as avoiding delays and losses in transport while maintaining a continuous supply of oil and gas. Waterways are described as most suitable for carrying heavy, bulky goods efficiently and with less environmental impact.
This document provides information about combustion and flames. It defines combustion as the burning of substances in air or oxygen with the evolution of heat and light. Combustible substances burn, while non-combustible substances do not. Three conditions are needed for combustion: oxygen, heat, and a fuel source. Fuels can be solid, liquid, or gas. Good fuels have characteristics like low ignition temperature and high calorific value. The document also describes soda-acid type fire extinguishers, how they work by releasing carbon dioxide gas when the acid bottle breaks, and their parts like the container and knob.
The document defines combustion as the chemical process where a substance reacts with oxygen to produce heat. It requires three conditions: a fuel, oxygen from air, and heat. Combustible substances that burn are called fuels. Combustion can be spontaneous or explosive. Fire is controlled by methods like using water or carbon dioxide to cut off the oxygen supply or reduce heat. A flame zone forms when fuels vaporize during burning and has inner, middle, and outer zones of different temperatures and colors.
The document discusses combustion and different types of fuels. It defines combustion as a chemical reaction between a substance and oxygen that produces heat. Fuels can be solid, liquid or gas. Examples of different fuels are provided. The document also discusses flame, ignition temperature, fire extinguishers, types of combustion like rapid, spontaneous and slow combustion. It provides information on calorific values of different fuels and environmental disadvantages of fuel combustion.
Presentation on gravitation for class 9th Rahul Shukla
It contains a brief description of gravitation with a video.
This presentation is with a deginer font and a classic theme.
It also consist a beautiful song
COMBUSTION AND FLAME PPT- SHORT NOTES/CLASS8/SCIENCE/CHEMISTRYRidhima Wahi
This is a PPT on the chapter- Combustion and Flame, of class 8.
The PowerPoint presentation will help you get an outline of the chapter, and also help create short notes (for revision)
I hope that would be something of your benefit. :)
CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE Gaurav Ghankhede
SCIENCECLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV CLASS 8 NCERT CHAPTER 6 COMBUSTION AND FLAME BY GAURAV GHANKHEDE GHANKHEDE
Sir Isaac Newton was an English mathematician, astronomer, physicist, and natural philosopher. He was born in 1643 in Lincolnshire, England and was educated at The King's School and Trinity College, where he studied mathematics and astronomy. During his private studies in the 1660s, Newton developed the foundations of calculus and made discoveries in optics and mechanics that helped lay the foundations of classical mechanics. He formulated Newton's laws of motion and universal gravitation, which dominated the scientific view of the physical universe for the next three centuries.
Transport,communication and trade for class 8LearnX365
This document discusses various modes of transportation and communication in India, including roadways, railways, pipelines, waterways, airways, and means of mass communication. It notes that transportation helps transfer technology, link traders, transport people and goods, defend the country, and shorten distances. Railways are described as having problems like old tracks, passengers without tickets, pulling emergency chains unnecessarily, and facing competition from airways. Pipelines are highlighted as avoiding delays and losses in transport while maintaining a continuous supply of oil and gas. Waterways are described as most suitable for carrying heavy, bulky goods efficiently and with less environmental impact.
This document provides information about combustion and flames. It defines combustion as the burning of substances in air or oxygen with the evolution of heat and light. Combustible substances burn, while non-combustible substances do not. Three conditions are needed for combustion: oxygen, heat, and a fuel source. Fuels can be solid, liquid, or gas. Good fuels have characteristics like low ignition temperature and high calorific value. The document also describes soda-acid type fire extinguishers, how they work by releasing carbon dioxide gas when the acid bottle breaks, and their parts like the container and knob.
It is always amazing to see the interaction of planets, Sun, Stars, and other celestial objects in space which leads to astronomical events. In this chapter we will learn certain laws of physics which explains gravitation between celestial objects, free fall of body, mass and weight of the objects.
Lines and angles class 9 ppt made by hardik kapoorhardik kapoor
This document defines and provides examples of various lines and angles. It begins by introducing lines, rays, line segments and points. It then discusses intersecting and non-intersecting lines, as well as perpendicular lines. The document defines acute, right, obtuse, straight and reflex angles. It also discusses adjacent angles, linear pairs of angles and vertically opposite angles. Finally, it covers parallel lines and transversals, defining corresponding angles, alternate interior angles, alternate exterior angles and interior angles on the same side of a transversal.
Dmitri Mendeleev was a Russian scientist born in 1834 who is considered the father of the periodic table. He arranged the elements in order of atomic mass, noticing patterns that allowed him to predict properties of undiscovered elements. His periodic table was published in 1869 and proved remarkably accurate, with three predicted elements discovered shortly after. Mendeleev made many contributions in chemistry and is honored by having the radioactive element with atomic number 101 named after him as Mendelevium. He died in 1907 at age 73.
This document summarizes a science fiction story called "The Fun They Had" by Isaac Asimov. It discusses the story's main characters, Margie and Tommy, who are 11 and 13 years old respectively. In the story, Margie's time has telebooks and ebooks, while Tommy describes attending an old-fashioned school with paper books and a mechanical teacher. The summary outlines how the two children compare their different educational experiences and realize some benefits of the older system.
Sir C.V. Raman was chosen as the subject of the biography due to his extraordinary abilities and curiosity that led to his Nobel Prize-winning discovery. He was born in 1888 in India and showed academic excellence from a young age, obtaining degrees in physics. His curiosity about the color of the sea led to his discovery of the Raman effect in 1922, for which he received the 1930 Nobel Prize in Physics. Later in his career, he devoted himself to setting up the Raman Research Institute in Bangalore and serving as the head of the Indian Academy of Science until his death in 1970.
This document provides an overview of key concepts in gravitation including: the definition of gravitation; Newton's law of universal gravitation; acceleration due to gravity and how it varies with height and depth; escape velocity; orbital velocity; gravitational potential; time period of satellites; Kepler's laws of planetary motion; and types of satellites. Key points covered include how gravity decreases with height but increases with depth below the Earth's surface, and definitions of geostationary, polar, and binding energy as they relate to satellites orbiting the Earth.
This document discusses coal, petroleum, and natural gas as exhaustible fossil fuels. It explains that coal was formed from plant matter that sank into swamps over 300 million years ago and was subjected to heat and pressure. Coal can be categorized into types based on carbon content and properties. Petroleum was formed from marine organisms buried under layers of sediment. Natural gas consists mainly of methane and was also formed from ancient organisms. The document also notes that fossil fuels are limited resources and their combustion causes environmental problems.
Longitude and latitude specify the location of a point on Earth's surface. Longitude lines run north-south and measure east or west of the Prime Meridian in London. Latitude lines run east-west and measure north or south of the equator. Time zones group regions under a standard time to coordinate schedules. The International Date Line demarcates calendar days and generally follows the 180 meridian, with some deviations to keep whole countries together. Crossing it can result in losing or gaining a day of travel depending on direction.
Natural resources can be classified as either inexhaustible or exhaustible. Coal is an exhaustible resource that was formed from ancient forests over millions of years. It is important as a fuel for cooking, electricity production, and in manufacturing steel and chemicals. Petroleum is another exhaustible fossil fuel formed from ancient marine organisms. It is refined into useful fuels and products like gasoline, diesel, kerosene, wax and lubricating oil. Fossil fuels like coal and petroleum are finite and non-renewable, so they need to be conserved through efficient use and developing alternative energy sources.
Albert Einstein was a German-born theoretical physicist and philosopher. He developed the theory of relativity, one of the pillars of modern physics. He is regarded as one of the most influential scientists of the 20th century. Einstein received the Nobel Prize in Physics in 1921 for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect. He immigrated to the United States in 1933 and became an American citizen in 1940. Einstein died at the age of 76 in Princeton, New Jersey.
Forces can be pushes, pulls, or a combination of both. A force is any interaction between two objects that causes a change in motion or shape. There are two main types of forces - contact forces that act when objects touch, and non-contact forces that act over a distance like magnetic or gravitational forces. Pressure is the amount of force applied over a given area, and depends on both the force and the contact area. Applying force over a smaller area results in greater pressure.
Albert Einstein was born in Germany in 1879 and studied physics. He made groundbreaking discoveries in physics including the theory of relativity and the equation E=mc2. Einstein received several prestigious awards for his scientific achievements, including the Nobel Prize in Physics. Later in life, he helped establish the Hebrew University of Jerusalem and advocated for world government.
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter 4 - Heat, Science, Class 7
HEAT
HOT AND COLD
THERMOMETER
CLINICAL THERMOMETER
HOW TO USE CLINICAL THERMOMETER?
WHILE USING CLINICAL THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
LABORATORY THERMOMETER
WHILE USING LABORATORY THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
DIGITAL THERMOMETER
TRANSFER OF HEAT
CONDUCTION
CONDUCTORS
INSULATORS
CONVECTION
RADIATION
SEA BREEZE
LAND BREEZE
CLOTHES IN WINTERS AND SUMMERS
HOW DO WOOLLEN CLOTHS KEEP US WARM?
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur & Teacher)
The document discusses the components of our solar system. It explains that stars like the sun produce their own light, while planets and satellites receive light from stars. It defines our solar system as containing stars, planets, satellites, dwarf planets, and asteroids revolving around the sun. Gravity is described as the force that pulls celestial bodies together and allows planets to orbit stars at fixed distances. Space travel requires overcoming Earth's gravity through rocket technology. India's space agency ISRO has had successful space missions, and several Indian astronauts have traveled to space.
Albert Einstein was born in Germany in 1879 and went on to become one of the most influential physicists of the 20th century. In his "miracle year" of 1905, he published four groundbreaking papers, including his special theory of relativity containing his famous equation E=mc2. He was awarded the Nobel Prize in Physics in 1921 for his services to theoretical physics. Later in life, Einstein immigrated to the United States and took a position at the Institute for Advanced Study in Princeton, New Jersey. He died in 1955 at the age of 76.
Sound is a form of energy made by vibrations. When an object vibrates, it causes the air particles around it to move in a longitudinal wave. These particles then bump into nearby particles, transferring the vibrations until the energy runs out. Sound needs a medium, such as air, water or other matter, to travel through as it cannot travel through a vacuum. The pitch and loudness of sound depends on the frequency and amplitude of vibrations.
This document discusses combustion and flames. It defines combustion as a chemical reaction between a substance and oxygen that produces heat and light. It identifies the three necessary conditions for combustion: a combustible substance, a supporter of combustion (usually oxygen), and heating the substance to its ignition temperature. It describes the structure of a flame and different types of combustion. It also discusses fuels and compares their calorific values and environmental impacts when burned.
Dmitri Mendeleev was a Russian chemist born in 1834. He studied chemistry and became a professor. He is most famous for creating the first periodic table of elements in 1869, arranging elements based on atomic weight and properties. His periodic table predicted properties of undiscovered elements and helped establish the modern organization of elements that is still used today.
This document provides an overview of several natural phenomena including lightnings, electrical charges, earthquakes, and seismographs. It begins with an introduction to natural phenomena and then discusses lightnings, how objects become electrically charged through friction, and how opposite charges attract and like charges repel. The document also explains how to test for electric charge using an electroscope and how charge is transferred. It then covers earthquakes, what causes them, how they are measured on the Richter scale, and safety precautions. Finally, it briefly discusses seismographs and their use in detecting seismic waves generated by earthquakes.
The document discusses combustion and flames. It defines combustion as the chemical process where a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. Different fuels have different ignition temperatures and burning properties. There are three main types of combustion: rapid, spontaneous, and explosion. A candle flame has three zones: the blue outer zone is the hottest, the yellow middle zone is luminous, and the black inner zone has unburnt fuel vapors. Air is essential for combustion, and fire can be controlled by removing fuel, oxygen or heat.
The document discusses combustion, fuels, and fire extinguishing. It defines combustion as the burning of substances in air with the release of heat and light. It explains that combustion requires a combustible substance, oxygen, and sufficient temperature. Fuels are selected based on properties like state, calorific value, and emissions. Fire can be extinguished by removing the fuel, reducing temperature, or limiting oxygen. Different fire extinguishers use substances like carbon dioxide to extinguish flames.
It is always amazing to see the interaction of planets, Sun, Stars, and other celestial objects in space which leads to astronomical events. In this chapter we will learn certain laws of physics which explains gravitation between celestial objects, free fall of body, mass and weight of the objects.
Lines and angles class 9 ppt made by hardik kapoorhardik kapoor
This document defines and provides examples of various lines and angles. It begins by introducing lines, rays, line segments and points. It then discusses intersecting and non-intersecting lines, as well as perpendicular lines. The document defines acute, right, obtuse, straight and reflex angles. It also discusses adjacent angles, linear pairs of angles and vertically opposite angles. Finally, it covers parallel lines and transversals, defining corresponding angles, alternate interior angles, alternate exterior angles and interior angles on the same side of a transversal.
Dmitri Mendeleev was a Russian scientist born in 1834 who is considered the father of the periodic table. He arranged the elements in order of atomic mass, noticing patterns that allowed him to predict properties of undiscovered elements. His periodic table was published in 1869 and proved remarkably accurate, with three predicted elements discovered shortly after. Mendeleev made many contributions in chemistry and is honored by having the radioactive element with atomic number 101 named after him as Mendelevium. He died in 1907 at age 73.
This document summarizes a science fiction story called "The Fun They Had" by Isaac Asimov. It discusses the story's main characters, Margie and Tommy, who are 11 and 13 years old respectively. In the story, Margie's time has telebooks and ebooks, while Tommy describes attending an old-fashioned school with paper books and a mechanical teacher. The summary outlines how the two children compare their different educational experiences and realize some benefits of the older system.
Sir C.V. Raman was chosen as the subject of the biography due to his extraordinary abilities and curiosity that led to his Nobel Prize-winning discovery. He was born in 1888 in India and showed academic excellence from a young age, obtaining degrees in physics. His curiosity about the color of the sea led to his discovery of the Raman effect in 1922, for which he received the 1930 Nobel Prize in Physics. Later in his career, he devoted himself to setting up the Raman Research Institute in Bangalore and serving as the head of the Indian Academy of Science until his death in 1970.
This document provides an overview of key concepts in gravitation including: the definition of gravitation; Newton's law of universal gravitation; acceleration due to gravity and how it varies with height and depth; escape velocity; orbital velocity; gravitational potential; time period of satellites; Kepler's laws of planetary motion; and types of satellites. Key points covered include how gravity decreases with height but increases with depth below the Earth's surface, and definitions of geostationary, polar, and binding energy as they relate to satellites orbiting the Earth.
This document discusses coal, petroleum, and natural gas as exhaustible fossil fuels. It explains that coal was formed from plant matter that sank into swamps over 300 million years ago and was subjected to heat and pressure. Coal can be categorized into types based on carbon content and properties. Petroleum was formed from marine organisms buried under layers of sediment. Natural gas consists mainly of methane and was also formed from ancient organisms. The document also notes that fossil fuels are limited resources and their combustion causes environmental problems.
Longitude and latitude specify the location of a point on Earth's surface. Longitude lines run north-south and measure east or west of the Prime Meridian in London. Latitude lines run east-west and measure north or south of the equator. Time zones group regions under a standard time to coordinate schedules. The International Date Line demarcates calendar days and generally follows the 180 meridian, with some deviations to keep whole countries together. Crossing it can result in losing or gaining a day of travel depending on direction.
Natural resources can be classified as either inexhaustible or exhaustible. Coal is an exhaustible resource that was formed from ancient forests over millions of years. It is important as a fuel for cooking, electricity production, and in manufacturing steel and chemicals. Petroleum is another exhaustible fossil fuel formed from ancient marine organisms. It is refined into useful fuels and products like gasoline, diesel, kerosene, wax and lubricating oil. Fossil fuels like coal and petroleum are finite and non-renewable, so they need to be conserved through efficient use and developing alternative energy sources.
Albert Einstein was a German-born theoretical physicist and philosopher. He developed the theory of relativity, one of the pillars of modern physics. He is regarded as one of the most influential scientists of the 20th century. Einstein received the Nobel Prize in Physics in 1921 for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect. He immigrated to the United States in 1933 and became an American citizen in 1940. Einstein died at the age of 76 in Princeton, New Jersey.
Forces can be pushes, pulls, or a combination of both. A force is any interaction between two objects that causes a change in motion or shape. There are two main types of forces - contact forces that act when objects touch, and non-contact forces that act over a distance like magnetic or gravitational forces. Pressure is the amount of force applied over a given area, and depends on both the force and the contact area. Applying force over a smaller area results in greater pressure.
Albert Einstein was born in Germany in 1879 and studied physics. He made groundbreaking discoveries in physics including the theory of relativity and the equation E=mc2. Einstein received several prestigious awards for his scientific achievements, including the Nobel Prize in Physics. Later in life, he helped establish the Hebrew University of Jerusalem and advocated for world government.
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter 4 - Heat, Science, Class 7
HEAT
HOT AND COLD
THERMOMETER
CLINICAL THERMOMETER
HOW TO USE CLINICAL THERMOMETER?
WHILE USING CLINICAL THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
LABORATORY THERMOMETER
WHILE USING LABORATORY THERMOMETER, THE FOLLOWING PRECAUTIONS SHOULD BE TAKEN
DIGITAL THERMOMETER
TRANSFER OF HEAT
CONDUCTION
CONDUCTORS
INSULATORS
CONVECTION
RADIATION
SEA BREEZE
LAND BREEZE
CLOTHES IN WINTERS AND SUMMERS
HOW DO WOOLLEN CLOTHS KEEP US WARM?
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur & Teacher)
The document discusses the components of our solar system. It explains that stars like the sun produce their own light, while planets and satellites receive light from stars. It defines our solar system as containing stars, planets, satellites, dwarf planets, and asteroids revolving around the sun. Gravity is described as the force that pulls celestial bodies together and allows planets to orbit stars at fixed distances. Space travel requires overcoming Earth's gravity through rocket technology. India's space agency ISRO has had successful space missions, and several Indian astronauts have traveled to space.
Albert Einstein was born in Germany in 1879 and went on to become one of the most influential physicists of the 20th century. In his "miracle year" of 1905, he published four groundbreaking papers, including his special theory of relativity containing his famous equation E=mc2. He was awarded the Nobel Prize in Physics in 1921 for his services to theoretical physics. Later in life, Einstein immigrated to the United States and took a position at the Institute for Advanced Study in Princeton, New Jersey. He died in 1955 at the age of 76.
Sound is a form of energy made by vibrations. When an object vibrates, it causes the air particles around it to move in a longitudinal wave. These particles then bump into nearby particles, transferring the vibrations until the energy runs out. Sound needs a medium, such as air, water or other matter, to travel through as it cannot travel through a vacuum. The pitch and loudness of sound depends on the frequency and amplitude of vibrations.
This document discusses combustion and flames. It defines combustion as a chemical reaction between a substance and oxygen that produces heat and light. It identifies the three necessary conditions for combustion: a combustible substance, a supporter of combustion (usually oxygen), and heating the substance to its ignition temperature. It describes the structure of a flame and different types of combustion. It also discusses fuels and compares their calorific values and environmental impacts when burned.
Dmitri Mendeleev was a Russian chemist born in 1834. He studied chemistry and became a professor. He is most famous for creating the first periodic table of elements in 1869, arranging elements based on atomic weight and properties. His periodic table predicted properties of undiscovered elements and helped establish the modern organization of elements that is still used today.
This document provides an overview of several natural phenomena including lightnings, electrical charges, earthquakes, and seismographs. It begins with an introduction to natural phenomena and then discusses lightnings, how objects become electrically charged through friction, and how opposite charges attract and like charges repel. The document also explains how to test for electric charge using an electroscope and how charge is transferred. It then covers earthquakes, what causes them, how they are measured on the Richter scale, and safety precautions. Finally, it briefly discusses seismographs and their use in detecting seismic waves generated by earthquakes.
The document discusses combustion and flames. It defines combustion as the chemical process where a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. Different fuels have different ignition temperatures and burning properties. There are three main types of combustion: rapid, spontaneous, and explosion. A candle flame has three zones: the blue outer zone is the hottest, the yellow middle zone is luminous, and the black inner zone has unburnt fuel vapors. Air is essential for combustion, and fire can be controlled by removing fuel, oxygen or heat.
The document discusses combustion, fuels, and fire extinguishing. It defines combustion as the burning of substances in air with the release of heat and light. It explains that combustion requires a combustible substance, oxygen, and sufficient temperature. Fuels are selected based on properties like state, calorific value, and emissions. Fire can be extinguished by removing the fuel, reducing temperature, or limiting oxygen. Different fire extinguishers use substances like carbon dioxide to extinguish flames.
The document is a lesson plan about combustion and flames for an 8th grade science class. It includes objectives, an introduction to combustion, the three main types of combustion (rapid, spontaneous, explosion), ignition temperature, combustible and non-combustible substances, the conditions needed for combustion, how to control fires, and the structure and properties of flames. It also discusses fuels, fuel efficiency, and the harmful products from burning fuels that can cause pollution and global warming.
This document discusses combustion and flames. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. For combustion to occur, the substance must reach its ignition temperature. The document then describes several experiments that demonstrate combustion requires oxygen and a minimum temperature to occur. It explains how different substances have different ignition temperatures.
This document discusses combustion and flames. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen from air, and heat. Combustion can be controlled by removing one of these conditions. There are different types of combustion like rapid, spontaneous, and explosion. A flame is the zone of combustion and results when a fuel vaporizes during burning. Fuels can be solid, liquid or gaseous and have varying calorific values. Burning fuels can harm the environment by releasing pollutants.
This document discusses combustion and different types of fuels. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. Fuels can be solid, liquid or gas. Different fuels have different ignition temperatures and calorific values. Combustion requires fuel, oxygen and an ignition source. Proper combustion produces a flame, while materials like coal burn without a flame. Combustion has harmful effects like air pollution, so cleaner burning fuels like CNG are preferable.
The document discusses combustion, which is a chemical process where a substance reacts with oxygen and gives off heat, and covers topics such as what fuels are, how fires start and spread, the different types of combustion, and some of the harmful products that result from burning fuels like carbon dioxide and acid rain. It also provides examples of activities one can do to observe combustion like using a candle inside a chimney or glass and exploring what affects the flame.
CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
This document discusses combustion and flames. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. It describes the structure of a candle flame as having three zones - an outer blue zone of complete combustion, a middle yellow luminous zone of partial combustion, and an inner black zone of unburnt fuel vapors. It also discusses different types of fuels and the characteristics of good fuels. The calorific value, or heat produced from combustion, is defined and examples are given. Harmful environmental effects of burning fuels are outlined.
This document discusses combustion and flames. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. It describes the structure of a candle flame as having three zones - an outer blue zone of complete combustion, a middle yellow luminous zone of partial combustion, and an inner black zone of unburned fuel vapors. It also discusses different types of fuels and their calorific values, as well as the harmful environmental effects of burning fuels like air pollution and global warming.
This document provides information about combustion, fuels, and flames. It discusses that combustion is a chemical reaction that generates heat when a material reacts with oxygen. Fuels are materials that burn in combustion and produce heat. Different fuels have different calorific values, or amounts of heat produced during combustion. A flame is produced when a fuel is burned as a gas. A candle flame has distinct color zones - the innermost dark zone where wax vaporizes, a blue zone where vaporized wax burns completely, and an outer luminous yellow zone. The non-luminous zone of the flame is the hottest part.
Chapter - 6, Combustion and Flame, Science, Class 8Shivam Parmar
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter - 6, Combustion and Flame, Science, Class 8
INTRODUCTION
COMBUSTION AND TYPES
IGNITION TEMPERATURE
INFLAMMABLE SUBSTANCE
SOURCES OF SOLAR ENERGY
TYPES OF COMBUSTION
FIRE EXTINGUISHER
FLAME
FUEL AND ITS TYPES
FUEL EFFICIENCY
GLOBAL WARMING
ACID RAIN
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur)
The document discusses combustion, which is defined as the chemical process of burning a substance in air or oxygen with the release of heat and light energy. It describes combustible materials as those that catch fire easily when heated in air or oxygen. Fuels that undergo combustion are called combustible substances and can be solid, liquid, or gas. Oxygen in air supports combustion by helping substances burn. Conditions for combustion require a combustible substance, oxygen supply, and temperature above the ignition temperature. Types of combustion include slow, rapid, spontaneous, and explosive. The document also discusses flames, candle flame structure, calorific values of fuels, fuel characteristics, and harmful effects of combustion.
This document discusses combustion and flames. It defines combustion as a chemical process in which a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. Different types of combustion are described such as rapid combustion and spontaneous combustion. The structure of a candle flame is explained as having three zones: the outer blue zone of complete combustion, the middle yellow zone of partial combustion, and the inner black zone of unburnt fuel vapors. Fuels are classified as solid, liquid, or gaseous. The calorific values and environmental impacts of various fuels are also outlined.
This document discusses combustion and flames. It defines combustion as a chemical process in which a substance reacts with oxygen to produce heat. Three conditions are needed for combustion: a fuel, oxygen, and heat. Different types of combustion are described such as rapid combustion and spontaneous combustion. The structure of a candle flame is explained as having three zones: the outer blue zone of complete combustion, the middle yellow luminous zone of partial combustion, and the inner black zone of unburnt fuel vapors. Different types of fuels - solid, liquid, and gaseous - are outlined along with their characteristics and calorific values. Harmful environmental effects of burning fuels like global warming and acid rain are also noted.
Sources of energy (2) (1)_230818_201521.pdfGethuGiri1
The document discusses different sources of energy. It explains that sources of energy can be renewable or non-renewable. Renewable sources like solar, wind and hydro power can be replenished, while non-renewable sources like fossil fuels take a long time to form and are being depleted. Fossil fuels like coal, petroleum and natural gas are examples of non-renewable energy sources that were formed from the remains of ancient plants and animals. The document also discusses the characteristics, uses and environmental impacts of various fossil fuels. Thermal power plants that generate electricity by burning fossil fuels are also mentioned.
The document discusses combustion and fuels. It defines combustion as a chemical reaction that produces heat and light as a substance reacts with oxygen. It also discusses requirements for combustion like fuel, oxygen, and heat. It explains concepts such as ignition temperature and types of combustion. The document also covers ideal fuel properties and environmental impacts of burning fuels.
The document discusses fire hazards and prevention. It defines the elements of the fire triangle as fuel, heat, and oxygen. It identifies various causes of fires such as matches, electrical faults, arson, open flames, fireworks, and static electricity. It provides examples of fuel sources like wood, grass, and kerosene. The document also discusses preventing fires at home through safe practices and what to do in the event of a fire, such as calling emergency services. Safety measures and standard fire safety procedures are emphasized.
This document discusses combustion and flames. It defines combustion as a chemical process in which a substance reacts with oxygen to give off heat and sometimes light. It identifies different types of solid, liquid, and gaseous fuels that can undergo combustion. It explains ignition temperature and the components of modern matchsticks that allow combustion to occur. It also discusses inflammable substances, supporters of combustion, types of combustion including rapid, spontaneous, and explosions. The document describes the structure of a flame and different zones within it. It defines calorific value and discusses how burning fuels can lead to harmful products like carbon monoxide, carbon dioxide, and acid rain.
This document discusses combustion and related topics. It defines combustion as a chemical process where a substance reacts with oxygen to produce heat. It also defines key terms like fuel, ignition temperature, inflammable substances, and types of combustion such as rapid and spontaneous combustion. The document notes that controlling fire involves cooling combustible materials below their ignition temperature. It also discusses explosion, fuel efficiency, and harmful products from burning fuels such as carbon particles, carbon monoxide, and carbon dioxide which causes issues like global warming. Pictures are provided as examples. The document was created for student benefit from various sources.
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Class 8 Chapter 6-Combustion and Flame Notes - Hakim.docx
1. Chapter 6- Combustion and Flame
We use different kinds of fuel for various purposes athome, in industry and for running
automobiles. These fuels are cow dung, wood, coal, charcoal, petrol, diesel, compressed
natural gas (CNG), etc.
Combustion: Itis a chemical reaction in which heat is released by a material when it reacts
with oxygen.
Fuel or Combustible Substance: Any materialthat undergoes combustion is called a
combustible substance. Itis also called as fuel. Some examples of fuels are petrol, diesel,
etc. The fuel may be in solid, liquid or gas state. Sometimes, light is also given off during
combustion, either as a flame or as a glow.
IgnitionTemperature:
(i) Itis the minimum temperature at which any material catches fire.
(ii) If the temperature of combustible substanceis lower than the ignition temperature
then the substancewill not burn.
Example: (i) Cooking oil catching fire when a frying pan is kept for long on a burning stove.
(ii) Keroseneoil and wood do not catch fire on their own at roomtemperature. But, if
keroseneoil is heated a little, it will catch fire. But if wood is heated a little, it would still
not catch fire.
Inflammable Substances:
Those materials which have low ignition temperature and catch fire easily are termed as
inflammable substances. Example includes petrol, LPG, etc.
Matchsticks:
Since ages, matchsticks are in use. Long ago, Egyptians used small pieces of pinewood
dipped in sulphur as matches. These days matchsticks arelot safer.
2. Modern matchsticks are made up with mixture of antimony trisulphideand potassium
chlorate with some glue and starch applied on the head of the match. The rubbing surface
has powdered glass and somered phosphorous. On striking match againstrough surface,
red phosphorous gets converted into white phosphorous and itreacts with potassium
chlorate to ignite antimony trisulphate and so the combustion takes place.
Matchstick
Things necessary for combustiontotake place:
(i) Fuel or Combustiblesubstance.
(ii) Air (With presenceof Oxygen in it).
(iii) Temperature above the Ignition temperature.
Measures tocontrol fire:
1. Fire Brigade Stations:
In caseof fire, fire brigades will extinguish the fire by sprinkling the water on the affected
areas. The water will bring down the temperature below its ignition temperature. As a
result, fire will stop spreading. Water vapour also surround thecombustible material,
helping in cutting off the supply of air. So, the fire is extinguished.
3. 2. Fire Extinguisher:
Water is the most common fire extinguisher. But, it works only on things like wood, paper,
etc. However, in case fire is caught on electrical things then, water being good conductor
of electricity will destroy that equipment. Even water is not good in case of fires due to oil,
petrol, etc.
For such cases, Carbon dioxide (CO2) is best extinguisher. This extinguisher cut off the air
supply and thus brings down the temperature below the ignition temperature as a result
fire gets extinguished. Moreover, it usually does not damage electrical equipment.
3. Use of Blankets:
If a person catches the fire, then blankets can be used to extinguish the fire.
4. Forest Fires:
In summer season, when temperature rises too high then the regions having dry grasses
4. will catch the fire. This fire spreads rapidly from grasses to trees and eventually entire
forestis on fire. And it is difficult to manage such fires.
Different Types of Combustion:
1. RapidCombustion
In this type of combustion, the substances burns rapidly and yield light and heat.
Example:Bring a burning matchstick or a gas lighter near a gas stove in the kitchen. Turn on
the knob of the gas stove. We find that the gas burns rapidly and produces heat and light.
2. Spontaneous Combustion:
In this type of combustion, substances burst outinto flames suddenly without any known
reason.
5. Examples: Many disastrous fires in coal mines resultdue to this kind of combustion. The
heat rays coming fromthe sun or a lightning strikemight be responsiblefor this kind of
combustion.
3. Explosion:
In this type of combustion, all of a sudden reaction results into heat, light and sound.
Moreover, large quantity of gas also gets released.
Example: When a fire cracker is ignited, a sudden reaction takes place with the evolution
of heat, light and sound with the large amount of gas.
6.4 Flame
When something is burnt, a hot luminous gas emerges out of the substance. This gas
is called as flame.
The substances which vapourise during burning, giveflames. For example, kerosene
oil and molten wax risethrough the wick and are vapourised during burning and
formflames. Charcoal, on the other hand, does not vapouriseand so does not
producea flame.
6. Flame structure:
When flames are observed carefully, one can notice different layers of flame as shown in
figure below:
Outermostzone: It is blue in color and is hottest amongstall the zones. In this
portion, complete combustion takes place.
Middle zone: Itis yellow in color and is somewhathot. In this portion, partial
combustion takes place.
Innermostzone: Itis black in color and is coolest amongstall the zones.
Table 6.2 Materials forming Flame on Burning
S.N
o.
Material Forms flame Does not form
flame
1. Candle Yes
2. Magnesium Yes
3. Camphor Yes
4. Kerosene Stove Yes
5. Charcoal Yes
7. In Activity 6.6, could the vapours of waxcoming out of the glass tube be the cause of
the flame produced?
Activity 6.6
Light a candle (Caution: Be careful).
Hold a glass tube with a pair of
tongs and introduce its one end in
the dark zoneof a non-flickering candle
flame [Fig. 6.10 (a)]. Bring a
lighted matchstick near the other
end of the glass tube. Do you see a
flame? If so, whatis it that produces
a flame? Notice that the wax near
the heated wick melts quickly.
Fig. 6.10(b)
When the candle flame is steady,
introduce a clean glass plate/slide into
the luminous zoneof the flame [Fig.
6.10 (b)]. Hold it there with a pair of
tongs for about10 seconds. Then
remove it. What do you observe?
A circular blackish ring is formed on
the glass plate/slide. Itindicates the
deposition of unburntcarbon particles
present in the luminous zoneof the
flame.
8. Fig. 6.10(c)
Hold a thin long copper wirejust
inside the flame for about 30 seconds
[Fig. 6.10 (c)].
Notice that the portion of the copper
wire justoutside the flame gets red hot.
Does it indicate that the non-luminous
zone of the flame has a high
temperature? In fact, this part of the
flame is the hottest part [Fig. 6.10(d)].
Fig. 6.11
Goldsmiths blow the outermostzone
of a flame with a metallic blow-pipeformelting
gold and silver (Fig. 6.11). Why
do they use the outermostzone of the
flame?
Fuel:
The substancethat undergoes combustion is called as fuel. Examples of fuels are wood,
charcoal, petrol, kerosene, etc.
Characteristics of goodfuel:
(i) Itshould easily be available.
(ii) Itshould be cheap.
(iii) It should generate large amount of heat.
(iv) Itshould not leave any unwanted matter after combustion.
9. Ideal Fuel
(i) The fuel which satisfies all the characteristics of good fuel is termed as an ideal fuel.
(ii) Probably, there is as such no ideal fuel present.
Make a list of fuels familiar to you.
Group them as solid, liquid, and gaseous fuels as in Table 6.3.
Table 6.3 Types of Fuels
S. No. Solid Fuels Liquid Fuels Gaseous fuels
1. Coal Kerosene oil Natural gas
2. Wood Petrol LPG
3. Coke Diesel Biogas
Fuel Efficiency
The amount of heat energy produced on complete combustion of 1 kg of a fuel is
called its calorific value. The more is the calorific value of a fuel, more is the
efficiency of the fuel.
The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).
Calorific values of some fuels are given in Table 6.4.
10. Burning of Fuels Leads toHarmful Products
The increasing fuel consumption has harmfuleffects on the environment.
1. Carbon fuels like wood, coal, petroleum release unburnt carbon particles. These fine
particles are dangerous pollutants causing respiratory diseases, such as asthma.
2. Incomplete combustion of these fuels gives carbon monoxide gas. Itis a very poisonous
gas. Itis dangerous to burn coal in a closed room. The carbon monoxide gas produced can
kill persons sleeping in that room.
3. Combustion of most fuels releases carbon dioxide in the environment. Increased
concentration of carbon dioxide in the air is believed to cause global warming.
4. Burning of coal and diesel releases sulphur dioxide gas. Itis an extremely suffocating and
corrosivegas. Moreover, petrolengines give off gaseous oxides of nitrogen. Oxides of
sulphur and nitrogen dissolvein rain water and form acids. Such rain is called acid rain. Itis
very harmfulfor crops, buildings and soil.
Global Warming Acids Rain
The use of diesel andpetrol as fuels inautomobiles is being replacedby CNG
(CompressedNatural Gas), because CNG produces the harmful products invery small
amounts. CNG is a cleaner fuel.
12. NCERT Solution for Combustion and Flame
QUESTIONS FROM TEXTBOOK
Q.1. List conditions under which combustion can take place. Ans. Conditions necessary for
combustion are:
(i) Presence of a combustible substance.
(ii) Attainment of ignition temperature.
(iii) Proper supply of air to provide oxygen.
Q.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_________.
Ans. (a) pollution (b) kerosene.
(c) ignition temperature (d) water.
Q.3. Explain how the use of CNG in automobiles has reduced pollution in our cities. The
use of CNG in place of petrol and diesel reduce pollutions in following ways:
(i) Itproduces less carbon monoxide gas.
(ii) It produces less carbon dioxide gas.
(iii) Itproduces less amount of sulphur dioxide and nitrogen dioxide which cause acid rain.
(iv) No residueremains after combustion.
Q.4. CompareLPG and wood as fuels.
Ans. Differences:
13. Q.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
aluminium pipe does not.
Ans. (a) Water is a good conductor of electricity. Itconducts electricity and may result
electric shock.
(b) LPG has morecalorific value and produces no pollution. So it is better domestic
fuel than wood.
(c) The ignition temperature of paper is less, so it catches fire easily. Itdoes not
catch fire when wrapped around aluminium pipe because aluminium absorbs theheat, so
paper does not attain its ignition temperature.
Q.6. Make a labelled diagramof candle flame.
Ans.
Fig. 6.2 Different zones of Candle flame
Q.7. Name the unit in which the calorific value of a fuel is expressed.
Ans. Kilojoules per kg (kJ/kg)
Q.8. Explain how CO2 is able to control fires.
Ans. (i) CO2 forms a blanket around fire due to which supply of air is stopped.
(ii) CO2 also brings down the temperature of the fuel.
Q.9. Itis difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Ans. 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 haveno water, so they catch
fire easily.
14. Q.10. Which zoneof a flame does a goldsmith usefor melting gold and silver and why?
Ans. A goldsmith uses the outer zone(non-luminous zone) of a candle flame to melt gold
and silver because it is the hottest zone and has more temperature.
Q.11. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was
measured to be 180,000kJ. Calculate the calorific value of the fuel.
Ans. Total mass of fuel = 4.5 kg
Total heat produced = 180,000kJ
Heat produced by burning 1 kg of fuel = 180,000kJ/4.5 kg =40,000 kJ/kg.
So, calorific value of fuel = 40,000 kJ/kg.
Q.12. Can the process of rusting be called combustion? Discuss.
Ans. The process of rusting cannot be called combustion because in this process no
heat and light is produced. Dueto this reason iron is not considered as combustible
substance.
Q.13. 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 partof the candle flame.
Ramesh kept the beaker in the outermostpart of the flame. Whosewater will get heated
in a shorter time?
Ans. The water heated by Ramesh will get heated in a shorter time because he kept
his beaker near the hottest zoneof the flame.
17. CBSE Class 8 Science Chapter 6 MCQ Type Questions
1. Which among the following is a fuel?
(a) Solid, Liquid or gas
(b) Gas only
(c) Liquid only
(d) Solid only
2. What type of reaction is a combustion?
(a) exothermic
(b) endothermic
(c) volatile
(d) none of these
3. Large scale cutting down of trees could result in ___
(a) afforestation
(b) deforestation
(c) both afforestation and deforestation
(d) reforestation
18. 4. What is burning of LPG an example of?
(a) spontaneous combustion
(b) slow combustion
(c) rapid combustion
(d) both slow and spontaneous combustion
online source
https://www.careerlauncher.com/cbse-ncert/class-8/Science/CBSE-CombustionandFlame-
MCQ.html