Types of Chemical Reactions

Synthesis Reactions

Fe + O2 Fe2O34 3 2

A + B AB

Decomposition Reactions

H2Oelectricity

H2 + O22 2

AB A + B

Single Displacement Reactions

Mg + Ag Ag+

Mg(NO3)22 2NO3

A + B AC+B

Remember that in deciding which element is replaced (displaced),we use the generalrule that metal replacing metal and non-metal replacing non-metal.

Br2 + Ca CaBr2+I2

CB

I2I2

Double Displacement Reactions

Pb + KI PbI2KNO3 +2 2(NO3)2

Combustion Reactions

H2 + O2 H2O22

C + O2 CO2

Combustion of Ethane (C2H6)

Complete combustion…

Only two products in the complete combustionof a hydrocarbon.

C2H6 + O2 CO2 + H2O6472

Incomplete Combustion

C24H50 + 26O2 → 5C + 8CO2

+ 25H2O + 11CO

Four products result in the incomplete combustionof a hydrocarbon.

General Formulas

• SynthesisA + B AB

• DecompositionAB A + B

• Single DisplacementA + BC B + AC

• Double DisplacementAB + CD AD + CB

More General Formulas

• Complete combustion of hydrogenH2 + O2 H2O

• Complete combustion of carbonC + O2 CO2

• Complete combustion of a hydrocarbonCxHy + O2 CO2 + H2O

• Incomplete combustion of a hydrocarbonCxHy + O2 C + CO + CO2 + H2O

Try These...

• p240