1. Combination Reactions:
Combination reactions involve the combination of two or more elements or compounds to form a single product.
- Example 1:
- Hydrogen + Oxygen → Water
- 2H₂ + O₂ → 2H₂O
- Example 2:
- Iron + Sulfur → Iron(II) sulfide
- Fe + S → FeS
- Example 3:
- Carbon + Oxygen → Carbon dioxide
- C + O₂ → CO₂
- Example 4:
- Sodium + Chlorine → Sodium chloride
- 2Na + Cl₂ → 2NaCl
- Example 5:
- Magnesium + Oxygen → Magnesium oxide
- 2Mg + O₂ → 2MgO

2. Decomposition Reactions:
Decomposition reactions involve the breakdown of a single compound into two or more simpler substances.
- Example 1:
- Hydrogen peroxide → Water + Oxygen
- 2H₂O₂ → 2H₂O + O₂
- Example 2:
- Calcium carbonate → Calcium oxide + Carbon dioxide
- CaCO₃ → CaO + CO₂
- Example 3:
- Ammonium nitrate → Nitrogen + Water
- NH₄NO₃ → N₂ + 2H₂O
- Example 4:
- Silver oxide → Silver + Oxygen
- 2Ag₂O → 4Ag + O₂
- Example 5:
- Hydrogen iodide → Hydrogen + Iodine
- 2HI → H₂ + I₂

3. Single Replacement Reactions:
Single replacement reactions involve an element reacting with a compound to form a new compound and element.
- Example 1:
- Zinc + Hydrochloric acid → Zinc chloride + Hydrogen gas
- Zn + 2HCl → ZnCl₂ + H₂
- Example 2:
- Copper + Silver nitrate → Copper nitrate + Silver
- Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
- Example 3:
- Iron + Copper(II) sulfate → Iron(II) sulfate + Copper
- Fe + CuSO₄ → FeSO₄ + Cu
- Example 4:
- Aluminum + Hydrochloric acid → Aluminum chloride + Hydrogen gas
- 2Al + 6HCl → 2AlCl₃ + 3H₂
- Example 5:
- Magnesium + Copper(II) sulfate → Magnesium sulfate + Copper
- Mg + CuSO₄ → MgSO₄ + Cu

4. Double Replacement Reactions:
Double replacement reactions involve two compounds swapping ions to form two new compounds.
- Example 1:
- Sodium hydroxide + Hydrochloric acid → Sodium chloride + Water
- NaOH + HCl → NaCl + H₂O
- Example 2:
- Silver nitrate + Sodium chloride → Silver chloride + Sodium nitrate
- AgNO₃ + NaCl → AgCl + Na