1. Combustion Reactions
Element or compound reacts with oxygen, releasing energy (heat, light)
O2 always a reactant
Hydrocarbon often other reactant
Products = CO2 and H2O (when reactant = hydrocarbon)

2. Hydrocarbons Alkanes (CnH2n + 2) Methane Hexane Ethane Heptane
Propane Octane
Butane Nonane
Pentane Decane

3. COMPLETE combustion of a hydrocarbon…  CO2 + H2O + energy/heat
What happens if O2 is limited?

4. Combustion of heptane Combustion of glucose C6H12O6 + O2  CO2 + H2O
C7H O2  CO H2O
Combustion of glucose
C6H12O O2  CO H2O
Combustion of ethanol
C2H5OH

5. Some combustion reactions are also combination reactions.
2Mg O2  MgO
S O2  SO2