Combustion Reactions Combustion Reactions At the conclusion of

Combustion Reactions

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

5. Combustion Reactions • • • 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”: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark)

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

Combustion Reactions • In general: Cx. Hy + O 2 CO 2 + H 2 O • They are always exothermic (they give off heat) •

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

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

Combustion of Pentane: Predict the products and balance the reaction: C 5 H 12 + 8 O 2 5 CO 2 + 6 H 2 O

Combustion of Propanol Predict the products and balance the reaction: 2 C 3 H 7 OH + 9 O 2 6 CO 2 + 8 H 2 O

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

Practice Predict the products and balance the reaction of hexene burning in air: C 6 H 12 + O 2 C 6 H 12 + 9 O 2 6 CO 2 + 6 H 2 O