Combustion and fossil fuels
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Combustion is the process of burning a substance in the presence of oxygen, producing light and heat. It involves exothermic chemical reactions between a fuel and an oxidant. Burning produces light and heat. LPG is useful for cooking. Combustible substances burn to produce light and heat, while non-combustible substances do not. Spontaneous combustion occurs without an ignition source through heat buildup during oxidation. Rapid combustion releases a lot of heat and light quickly, and sometimes gas.
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combustion
The document defines combustion as a chemical process where a substance reacts with oxygen in air to produce heat and light. There are several types of combustion described, including spontaneous, rapid, complete, and incomplete combustion as well as explosions. Rapid combustion occurs when a substance burns quickly, producing heat and flame, often with the introduction of external heat. Incomplete combustion results in only partial burning of a fuel due to a lack of oxygen or low temperature, producing carbon monoxide. For combustion to occur, there must be a combustible substance, a supply of oxygen (air), and enough heat to raise the substance to its ignition temperature.
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• Explain the theories underlying combustion processes
• Describe how fire researchers have identified combustion processes using a variety of different classifications
• Provide a description of the stages and events of fire as it progresses from the initial stage to its final stage
• Explain the causes of flame over, flashover, and backdraft and review the procedures to prevent and protect against such events
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• Explain the theories underlying combustion processes
• Describe how fire researchers have identified combustion processes using a variety of different classifications
• Provide a description of the stages and events of fire as it progresses from the initial stage to its final stage
• Explain the causes of flame over, flashover, and backdraft and review the procedures to prevent and protect against such events
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1. A combustion reaction occurs when a fuel and oxidant react, producing light and heat.
2. The fire triangle refers to the three components needed for combustion - heat, oxygen, and fuel.
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Here are the answers to your questions:
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- Presence of a combustible substance
- Presence of a supporter of combustion like oxygen
- Attainment of ignition temperature of the substance
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3. No, the process of rusting cannot be called combustion because it does not involve burning in the presence of oxygen with the liberation of heat and light. Rusting is a slow oxidation reaction between iron and oxygen/water.
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Ch1,ch2
The weight of a 1 kg mass where the acceleration due to gravity is 9.75 m/s^2 is 9.75 N.
Weight = mass x acceleration due to gravity
= 1 kg x 9.75 m/s^2
= 9.75 N
So the weight of a 1 kg mass in the given conditions is 9.75 N.
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Chapter - 6, Combustion and Flame, Science, Class 8
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COMBUSTION AND TYPES
IGNITION TEMPERATURE
INFLAMMABLE SUBSTANCE
SOURCES OF SOLAR ENERGY
TYPES OF COMBUSTION
FIRE EXTINGUISHER
FLAME
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FUEL EFFICIENCY
GLOBAL WARMING
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Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
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Prepared By
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DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
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Cell No: 9431453730
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Combustion is a chemical process in which a substance reacts rapidly with oxygen and produces heat and light. The process is commonly associated with the formation of a flame. Understanding combustion is crucial in comprehending various natural and human-induced processes.
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Combustion is a reaction that produces heat and light as a substance reacts with oxygen. It requires a combustible or fuel substance, oxygen, and sufficient heat. There are two main types of combustion - rapid combustion which produces heat and light quickly, and spontaneous combustion which causes a material to burst into flames at room temperature without applied heat. For combustion to occur, the necessary conditions are a fuel, an oxidant such as oxygen gas, and an adequate activation energy to reach ignition temperature. Fire can be extinguished by removing one of these necessary conditions like fuel, oxygen or heat by using fire extinguishers such as water or other suppressants.
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Combustion and fossil fuels
- 2. WHAT IS COMBUSTION ? Combustion is defined as the process of burning of a substance in the presence of air or oxygen with the liberation of light and heat. Or Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species.
- 3. LETS SEE SOME IMAGES.
- 4. WHAT DO BURNING A SUBSTANCE PRODUCE ? • Burning a substance produces Light and heat HOW IS LPG USEFUL TO US? • LPG is used for Cooking
- 5. COMBUSTIBLE SUBSTANCES Substances that burn in air to produce light and heat are called combustible substances Eg- Paper , Wood , Kerosene , LPG .
- 6. NON-COMBUSTIBLE SUBSTANCES Substances that do not burn in air to produce light and heat are called combustible substances Eg-Water , Sand , Glass , Cement .
- 7. SPONTANEOUS COMBUSTION Spontaneous combustion is a type of combustion which occurs without an external ignition source. It is usually a slow process that can take several hours of decomposition/oxidation with heat build up to a point of ignition. • Coal can spontaneously ignite when exposed to oxygen which causes it to react and heat up when there is insufficient ventilation for cooling. • Pyrite oxidation is often the cause of coal spontaneous ignition in old Mine tailings. • Pistachio nuts are highly flammable when stored in large quantities, and are prone to self-heating and spontaneous combustion. • Large cow manure piles can spontaneously combust during conditions of extreme heat.
- 8. RAPID COMBUSTION It’s a Type of combustion where lot of heat and light is released in a short time span. Sometimes, a large volume of gas is liberated in combustion besides the production of heat and light.
- 9. COMPLETE COMBUSTION In complete combustion, the reactant burns in oxygen, producing a limited number of products. When a hydrocarbon burns in oxygen, the reaction will only yield carbon dioxide and water. When elements are burned, the products are primarily the most common oxides. Carbon will yield carbon dioxide, nitrogen will yield nitrogen dioxide, sulfur will yield sulfur dioxide, and iron will yield iron(III) oxide.
- 10. INCOMPLETE COMBUSTION Incomplete combustion occurs when there isn't enough oxygen to allow the fuel to react completely to produce carbon dioxide and water. It also happens when the combustion is quenched by a heat sink such as a solid surface or flame trap.
- 11. EXPLOSION The sudden evolution of large quantities of gas creates excessive pressure that produces a loud noise. Combustion need not involve oxygen; e.g., hydrogen burns in chlorine to form hydrogen chloride with the liberation of heat and light characteristic of combustion.