R1.3.1/R1.3.2 Combustion

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8 Terms

1
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Combustion of alkanes

Alkanes react with oxygen to form CO₂ and H₂O.

Exothermic reaction with negative enthalpy change.

Releases large amounts of heat.

2
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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.

<p>Enthalpy values are negative and increase in magnitude with carbon chain length.</p><p> More CO₂ and H₂O produced with longer chains.</p>
3
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Complete combustion of alkanes

Occurs with excess oxygen.

Produces carbon dioxide and water.

Example: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

<p>Occurs with excess oxygen. </p><p>Produces carbon dioxide and water. </p><p>Example: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.</p>
4
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Incomplete combustion of alkanes

Occurs with limited oxygen.

Produces CO and/or C with water.

Less efficient, more pollutants formed.

<p>Occurs with limited oxygen.</p><p>Produces CO and/or C with water. </p><p>Less efficient, more pollutants formed.</p>
5
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Combustion of alcohols
Alcohols react with oxygen to form CO₂ and H₂O. Reaction is exothermic. Involves the hydroxyl functional group.
6
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Complete combustion of alcohols

Occurs in excess oxygen.

Produces CO₂ and H₂O.

<p>Occurs in excess oxygen. </p><p>Produces CO₂ and H₂O. </p>
7
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Incomplete combustion of alcohols

Occurs with limited oxygen.

Produces CO or C with water.

Less energy released than complete combustion.

<p>Occurs with limited oxygen. </p><p>Produces CO or C with water. </p><p>Less energy released than complete combustion.</p>
8
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Enthalpy trend in alcohol combustion

Values are negative and more exothermic with more carbon atoms.

<p>Values are negative and more exothermic with more carbon atoms. </p>