Classifying Reactions

5 Types of Reactions Synthesis Decomposition Single-replacement Double-replacement Combustion

Synthesis Two Reactants combine to make One Product Examples: Products A + B  AB Mg + Cl2  MgCl2 Iron reacts with sulfur to produce … iron (III) sulfide 3 2 Fe + S  Fe2S3

Decomposition One Reactant breaks down into Two Products Examples: Reactants Products AB  A + B CaO + CO2 CaCO3  Mercury (II) oxide reacts to form … mercury and oxygen 2 HgO  2 Hg + O2

Single-replacement Single metal swaps with the compound’s metal Examples: Reactants Products B + AC A + BC  Mg + Zn(NO3)2  Mg(NO3)2 + Zn Iron (III) reacts with copper (II) sulfate to form … iron (III) sulfate and copper 3 3 2 Fe + CuSO4  Fe2(SO4)3 + Cu

Double-replacement Both metals switch Examples: Reactants Products AB + CD  CB + AD K2CO3 + BaCl2  2KCl + BaCO3 Sodium sulfide reacts with cadmium (II) nitrate to produce … sodium nitrate and cadmium (II) sulfide Na2S + Cd(NO3)2  CdS + NaNO3 2

Combustion Hydrocarbon and Oxygen React to form Carbon Dioxide and Water Examples: Products Reactants CH4 + 2O2  CO2 + H2O C6H6 reacts with air to produce . . . carbon dioxide and water 2 C6H6 + O2  15 12 CO2 + H2O 6