Key Points: Chemical Reactions and Equations
- Combination: A + B → AB
- Decomposition: AB → A + B
- Displacement: A + BC → AC + B
- Double displacement: AB + CD → AD + CB
- Oxidation: gain of oxygen or loss of hydrogen
- Reduction: loss of oxygen or gain of hydrogen
- Example (combination): CaO + H₂O → Ca(OH)₂
- Example (decomposition): 2H₂O → 2H₂ + O₂ (electrolysis)
- Example (displacement): Fe + CuSO₄ → FeSO₄ + Cu
- Example (double displacement): Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2NaCl