1. Combination reactions: Two or more substances combine to form a single product.

* Example: 2H₂ + O₂ → 2H₂O

2. Decomposition reactions: A single substance breaks down into two or more products.

* Example: 2H₂O → 2H₂ + O₂

3. Single-replacement reactions: One element replaces another element in a compound.

* Example: Fe + CuSO₄ → FeSO₄ + Cu

4. Double-replacement reactions: Two compounds exchange ions to form two new compounds.

* Example: AgNO₃ + NaCl → AgCl + NaNO₃

5. Combustion reactions: A substance reacts with oxygen, releasing energy in the form of light and heat.

* Example: CH₄ + 2O₂ → CO₂ + 2H₂O