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Combustion Reactions. Combustion Reactions: At the conclusion of our time together, you should be able to: 1.Identify a basic combustion reaction 2.Balance.

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Presentation on theme: "Combustion Reactions. Combustion Reactions: At the conclusion of our time together, you should be able to: 1.Identify a basic combustion reaction 2.Balance."— Presentation transcript:

1 Combustion Reactions

2 Combustion Reactions: At the conclusion of our time together, you should be able to: 1.Identify a basic combustion reaction 2.Balance a combustion reaction

3 5. Combustion Reactions Combustion reactions occur when a hydrocarbon reacts with oxygen gas. Combustion reactions occur when a hydrocarbon reacts with oxygen gas. This is also called burning!!! In order to burn something you need the 3 things in the “fire triangle”: This is also called burning!!! In order to burn something you need the 3 things in the “fire triangle”: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark) 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark)

4 Combustion Reactions In general: C x H y + O 2  CO 2 + H 2 O In general: C x H y + O 2  CO 2 + H 2 O Products in combustion are ALWAYS carbon dioxide and water. (although incomplete burning does cause some by- products like carbon monoxide) Products in combustion are ALWAYS carbon dioxide and water. (although incomplete burning does cause some by- products like carbon monoxide) Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C 8 H 18 ) Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C 8 H 18 )

5 Combustion Reactions In general: C x H y + O 2  CO 2 + H 2 O In general: C x H y + O 2  CO 2 + H 2 O They are always exothermic They are always exothermic (they give off heat) (they give off heat)

6 Combustion Reactions Combustion Reactions Edgar Allen Poe’s drooping eyes and mouth are potential signs of CO poisoning.

7 Combustion of Methane CH 4 + O 2  CH 4 + O 2  CO 2 + H 2 O 1 2 2

8 Combustion of Pentane: Predict the products and balance the reaction: Predict the products and balance the reaction: C 5 H 12 + O 2  CO 2 + H 2 O CO 2 + H 2 O 56 8

9 Predict the products and balance the reaction: Predict the products and balance the reaction: C 3 H 7 OH + O 2  CO 2 + H 2 O Combustion of Propanol 2 68 9

10 Redox and Combustion: Let’s see if you can: 1.Identify a basic combustion reaction 2.Balance a combustion reaction

11 Practice Predict the products and balance the reaction of hexene burning in air: C 6 H 12 + O 2  C 6 H 12 + O 2  CO 2 + H 2 O 669

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