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Combustion Reactions

Combustion Reactions. And Their Products. Combustion. a chemical reaction that occurs in the presence of OXYGEN and the release of ENERGY. combustion reactions involve the burning of hydrocarbons an organic compound containing only carbons and hydrogen atoms.

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Combustion Reactions

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  1. Combustion Reactions And Their Products

  2. Combustion • a chemical reaction that occurs in the presence of OXYGEN and the release of ENERGY

  3. combustion reactions involve the burning of hydrocarbons an organic compound containing only carbons and hydrogen atoms

  4. Matter is conserved in all chemical processes

  5. Combustion of Methane Gas • CH4 + O2CO2 + H2O • REACTANTS = PRODUCTS • Oxides produced are released into the atmosphere as emissions

  6. Balancing Hydrocarbon Combustion Reactions • Start with the Carbons • Then the Hydrogens • Lastly balance the Oxygen's

  7. Example • CH4 + O2CO2 + H2O • 1CH4 + O21CO2 + H2O • 1CH4 + O21CO2 + 2H2O • 1CH4 + 2 O21CO2 + 2H2O

  8. Importance of CO2 • Photosynthesis • Cellular Respiration • Greenhouse Gas • Global warming • Increase CO2 , increases temperatures • Carbon Cycle

  9. Examples • C2H6+ O2 CO2 + H2O • C5H12 + O2 CO2 + H2O • C4H8 + O2 CO2 + H2O • C4H10 + O2 CO2 + H2O • Combustion of C8H18

  10. Carbon Monoxide • CO (g) is another common product of combustion • Carbon monoxide is produced when there is an incomplete combustion. • When the quantity of oxygen is limited • Automobile emissions

  11. Problems with carbon monoxide • inhaling – competes with the oxygen molecule on the hemoglobin • thus, decreases the availability of oxygen to your body • Furnace in your home - CO detectors

  12. Oxides of Sulfur • product of burning fuels • Coal • Crude oil • tar sands • natural gas

  13. Natural gas is another energy source that commonly contains sulfur, but in a form of hydrogen sulphide • H2S • present in Sour gas, • toxic to humans • If combined with water forms an acidic solution

  14. processing natural gas often involves the removal of hydrogen sulphide • This is called SWEETENING • 40 % of natural gas in Alberta contain sour gas, thus removal of H2S is vital

  15. Flaring Process • H2S + O2SO2 + H2O • SO2 + O2SO3 • sulfur dioxide • sulfur trioxide

  16. Facts • Burning coal in Alberta contains less sulfur than the coal burned in eastern Canada • emissions of SO2also comes from the refining of metal ores (nickle)

  17. Oxides of NITROGEN • 78.1 % of earth’s atmosphere contains N2 (nitrogen gas) • N2 + O2 2NO • 2NO + O2 2 NO2 • These are commonly referred to Nox compounds

  18. Common Sources of NOx • High temperature combustion processes • above 650 ‘c • Automobiles • Furnaces

  19. Monitoring Emissions in Alberta • Alberta Environment • show -- MAML movie (Mobile Air Monitoring Lab)

  20. Homework • read pages 152-162 • Do the following questions; • page 164 #1-10 • student hand-out (teacher provided0

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