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Types of Chemical Reactions (3.2) Combustion Reactions

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Presentation on theme: "Types of Chemical Reactions (3.2) Combustion Reactions"— Presentation transcript:

1 Types of Chemical Reactions (3.2) Combustion Reactions

2 The Fire Triangle for a combustion reaction to occur, 3 things must be present: Fuel Oxygen Heat

3 a hydrocarbon is a compound that is composed only of the elements carbon and hydrogen
ex: methane gas CH4(g) combustion of a hydrocarbon always produces the compounds, carbon dioxide and water. ex: CH4(g) O2(g)  CO2(g) H2O(g)

4 Hydrocarbons A general formula for a hydrocarbon is CxHy
Hydrocarbons are often used as fuels Examples Name Formula methane CH4(g) propane C3H8(g) butane C4H10(g) acetylene C2H2(g)

5 Combustion Reactions Combustion of hydrocarbons can be complete or incomplete. the products depend on the amount of O2 present

6 Complete Combustion occurs when a sufficient amount of O2 is present
all the C atoms and H atoms react to form CO2 and H2O In general: hydrocarbon + oxygen  carbon dioxide + water CxHy + O2(g)  CO2(g) + H2O(g)

7 Incomplete Combustion
occurs if there is not a sufficient amount of O2 ie. fuel is not completely converted into carbon dioxide and water products include H2O as well as any combination of the following: CO C CO2 examples: 2 CH4(g) O2(g)  2 CO(g) + 4 H2O(g) 2C3H8(g)+ 7O2(g)  2C(s) + 2CO(g) + 2CO2(g) + 8H2O(g)


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