1. Synthesis Reactions: These reactions involve the combination of two or more reactants to form a single product. They are often represented as:

A + B → AB

* Example: The formation of water from hydrogen and oxygen:

2H₂ + O₂ → 2H₂O

2. Decomposition Reactions: These are the opposite of synthesis reactions. They involve the breakdown of a single reactant into two or more products.

AB → A + B

* Example: The decomposition of calcium carbonate into calcium oxide and carbon dioxide:

CaCO₃ → CaO + CO₂

3. Combustion Reactions: These reactions involve the rapid reaction between a substance with an oxidant, usually oxygen, to produce heat and light.

* Example: The burning of wood in the presence of oxygen:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

These are just a few examples. There are many other types of chemical reactions, such as single displacement, double displacement, and acid-base reactions.