How a system at equilibrium responds to disturbance — and fights back.
⚖️ The Referee of Chemistry
Imagine a packed stadium crowd. A streaker runs on the pitch — chaos! But the referee (Le Chatelier's Principle) immediately responds: "You disturbed the balance. The system will shift to oppose you."
Le Chatelier's Principle
"When a system at equilibrium is disturbed, it will shift to oppose the change and restore equilibrium."
🔬 Our Star Reaction: The Haber Process
N₂(g)+3H₂(g)
forward⇌reverse
2NH₃(g)
1 mole N₂ + 3 moles H₂ = 4 moles total gas
RIGHT side moles
2 moles NH₃ = 2 moles total gas
💡 This mole imbalance (4 vs 2) is why pressure changes matter!