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

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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


Octane ratings are based on the combustion of these two molecules

Octane Ratings are based on the combustion of these two molecules.


Products in combustion

Products in Combustion

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


Danger

DANGER!

  • 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?

  • 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?

  • 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

  • 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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