Chapter 7.10Combustion Reactions

By Shakara, Carlee and Alexis

What is a combustion reaction?

• Combustion reaction is a reaction in which oxygen reacts with another element or compound (generally a hydrocarbon) to produce energy in the form of heat and light

Element + O2 “oxide” + ENERGY

Hydrocarbon: organic compound consisting entirely of hydrogen and carbon

The 3 components in a combustion reaction

• Fuel• Oxygen (O2)• Heat

Example: When wood burns(fuel), O2 must be present and it produces heat and energy.

A Candle Burning

Two types of combustion

COMPLETE (Most Common)• Clean combustion with

a hydrocarbon produces carbon dioxide (CO2) and water

INCOMPLETE• Unclean combustion

with a hydrocarbon produces carbon and/or carbon monoxide (CO) as well as carbon dioxide (CO2)

Balancing Equation Review

• In every balanced equation, each side of the equation has the same number of atoms of each element.

• Balance Carbon and Hydrogen FIRST Balance Oxygen LAST

Complete Reaction

CH4 + 2 O2

CO2 + 2 H2O + heatKeyBlue: HydrogenYellow: CarbonRed: Oxygen

Incomplete Reaction

CH3OH + O2 2H20 + CO +heat

KeyBlue: HydrogenYellow: CarbonRed: Oxygen

True or False?1. Complete combustion is when carbon dioxide and water is formed.a. True b. False

2. An incomplete combustion is the most common.a. True b. False

3. The three things needed for a combustion reaction is heat, helium and oxygen.

4. O2 is a must in a combustion reaction.

a. True b. False

a. Trueb. False

PQP Homework Question

Write a balanced equation for the complete combustion of each of these compounds.1. Ethanol, C2H5OH

2. Propane, C3H8