Combustion
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Combustion. Students will identify and balance combustion reactions. What is a Hydrocarbon?. A hydrocarbon is chemical compound that only contains carbon and hydrogen. What is an Alkane ?. An alkane is a hydrocarbon that has the general formula of C X H 2X + 2

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Combustion

Combustion

Students will identify and balance combustion reactions


What is a hydrocarbon
What is a Hydrocarbon?

  • A hydrocarbon is chemical compound that only contains carbon and hydrogen


What is an alkane
What is an Alkane?

  • An alkane is a hydrocarbon that has the general formula of CXH2X + 2

  • C3H8 and C5H12 are examples of alkanes.


Names of alkanes
Names of Alkanes

  • Most alkanes are named after the number of carbon atoms.

  • The name

  • C5H12 = pentane

  • C8H18 = octane


Octane ratings
Octane Ratings

  • These numbers are the fuels octane rating.

  • The octane rating is the resistance of the fuel to autoignition



Products in combustion
Products in Combustion molecules.

  • The products (if burned in open air) are water and carbon dioxide


Danger
DANGER! molecules.

  • When hydrocarbons burn in enclosed areas, they can also produce CO which is a deadly gas.


Why do the bubbles float
Why do the bubbles float? molecules.

  • Air is mostly two types of gasses.

  • N2 which has a mass of 28 grams/mole

  • O2 which has a mass of 32 grams/mole

  • Methane (CH4) has a mass of 16grams/ mole

  • FYI: H2 = 2 grams/ mole is the lightest gas

  • Propane C3H8 has a mass of 44grams/mole is heavier than air which makes it more dangerous


Why does the gas burn so slowly
Why does the gas burn so slowly? molecules.

  • CH4 only has a small window of mixtures that burn. Methane only burns in mixtures between

  • 4.4 – 15% methane to air

  • Acetylene burns 2.5 – 82%

  • See Wikipedia http://en.wikipedia.org/wiki/Flammability_limit


Energy diagram
Energy Diagram molecules.

  • The candle supplies the energy to get the methane to start burning.

  • However, ones it starts, it supplies its own energy to react with the oxygen.

POTENTIAL

ENERGY


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