R1.3.1/R1.3.2 Combustion
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8 Terms
Alkanes react with oxygen to form CO₂ and H₂O.
Exothermic reaction with negative enthalpy change.
Releases large amounts of heat.
Enthalpy trend in alkane combustion
Enthalpy values are negative and increase in magnitude with carbon chain length.
More CO₂ and H₂O produced with longer chains.
Complete combustion of alkanes
Occurs with excess oxygen.
Produces carbon dioxide and water.
Example: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
Incomplete combustion of alkanes
Occurs with limited oxygen.
Produces CO and/or C with water.
Less efficient, more pollutants formed.
Occurs in excess oxygen.
Produces CO₂ and H₂O.
Occurs with limited oxygen.
Produces CO or C with water.
Less energy released than complete combustion.
Values are negative and more exothermic with more carbon atoms.
Note 
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