📖 Theory & Concepts ▼

Types of Chemical Reactions

Type General Form Example
Combination A + B → AB CaO + H₂O → Ca(OH)₂
Decomposition AB → A + B 2FeSO₄ → Fe₂O₃ + SO₂ + SO₃
Displacement A + BC → AC + B Fe + CuSO₄ → FeSO₄ + Cu
Double Displacement AB + CD → AD + CB Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

Key Observations

  • Combination: Heat release, steam evolution (exothermic)
  • Decomposition: Color change (green→brown), pungent gas smell
  • Displacement: Solution color fades (blue→green), metal deposits
  • Double Displacement: White precipitate (BaSO₄) forms instantly
Did you know? Quicklime (CaO) absorbs moisture from air so aggressively that it's used as a desiccant in food packaging!

Lab Manual

Core Theory

Select a reaction module to view specific theoretical principles.

Procedure

💡 All reactions are conducted under standard laboratory conditions.

⚠️ Safety

  • Adding water to quicklime (CaO) is strongly exothermic — it spits and steams; add water slowly and keep your face away.
  • Heating ferrous sulphate releases choking SO₂ / SO₃ gases — work in a fume cupboard and point the tube mouth away from everyone.
  • Barium chloride and its solutions are toxic if swallowed; wash hands after use and collect the barium waste separately.
  • Handle hot apparatus with a holder; wear goggles for every reaction.
  • Never taste or directly sniff the chemicals — waft gases gently if a smell is needed.
Reaction occurring...

Observations

Waiting for activity...
Classification PENDING
A + B → AB