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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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Combustion reactions

Combustion Reactions

And Their Products


Combustion

Combustion

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


Combustion reactions

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


Combustion reactions

  • Matter is conserved in all chemical processes


Combustion of methane gas

Combustion of Methane Gas

  • CH4 + O2CO2 + H2O

  • REACTANTS = PRODUCTS

  • Oxides produced are released into the atmosphere as emissions


Balancing hydrocarbon combustion reactions

Balancing Hydrocarbon Combustion Reactions

  • Start with the Carbons

  • Then the Hydrogens

  • Lastly balance the Oxygen's


Example

Example

  • CH4 + O2CO2 + H2O

  • 1CH4 + O21CO2 + H2O

  • 1CH4 + O21CO2 + 2H2O

  • 1CH4 + 2 O21CO2 + 2H2O


Importance of co 2

Importance of CO2

  • Photosynthesis

  • Cellular Respiration

  • Greenhouse Gas

  • Global warming

  • Increase CO2 , increases temperatures

  • Carbon Cycle


Examples

Examples

  • C2H6+ O2 CO2 + H2O

  • C5H12 + O2 CO2 + H2O

  • C4H8 + O2 CO2 + H2O

  • C4H10 + O2 CO2 + H2O

  • Combustion of C8H18


Carbon monoxide

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


Problems with c arbon monoxide

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


Oxides of sulfur

Oxides of Sulfur

  • product of burning fuels

  • Coal

  • Crude oil

  • tar sands

  • natural gas


Combustion reactions

  • 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


Combustion reactions

  • 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


Flaring process

Flaring Process

  • H2S + O2SO2 + H2O

  • SO2 + O2SO3

  • sulfur dioxide

  • sulfur trioxide


Facts

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)


Oxides of nitrogen

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


Common sources of no x

Common Sources of NOx

  • High temperature combustion processes

  • above 650 ‘c

  • Automobiles

  • Furnaces


Monitoring emissions in alberta

Monitoring Emissions in Alberta

  • Alberta Environment

  • show -- MAML movie (Mobile Air Monitoring Lab)


Homework

Homework

  • read pages 152-162

  • Do the following questions;

  • page 164 #1-10

  • student hand-out (teacher provided0


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