PDF Types of Chemical Reactions Worksheet - Ms. Maier's Science Weebly There are 5 major types of reactions simplified by the following equations: Synthesis/Combination A + B AB Decomposition AB A + B Combustion ? + O 2 ? Single Replacement A + BC AC + B orD + EF ED + F Double Replacement AB + CD AD + CB Classify each of the following reactions: 1. Zn + Cl 2