Le Chatelier's Principle (Leaving Cert Chemistry): Flashcards
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Le Chatelier's Principle
Le Chatelier's Principle
System at equilibrium adjusts to counteract stress
3 stresses affecting equilibrium
3 stresses affecting equilibrium
Concentration, temperature, pressure
Effect of increasing reactant concentration
Effect of increasing reactant concentration
Shifts equilibrium towards products
Effect of increasing product concentration
Effect of increasing product concentration
Shifts equilibrium towards reactants
Effect of increasing pressure on gases
Effect of increasing pressure on gases
Favours side with fewer gas molecules
Effect of decreasing pressure on gases
Effect of decreasing pressure on gases
Favours side with more gas molecules
Effect of increasing temperature
Effect of increasing temperature
Favours endothermic direction
Effect of decreasing temperature
Effect of decreasing temperature
Favours exothermic direction
Effect of catalysts on equilibrium position
Effect of catalysts on equilibrium position
No effect; only increase rate to reach equilibrium
Haber process: pressure used
Haber process: pressure used
Around 200 atm
Haber process: temperature used
Haber process: temperature used
400-500°C
Haber process: catalyst used
Haber process: catalyst used
Iron catalyst
Contact process: temperature used
Contact process: temperature used
450°C
Contact process: catalyst used
Contact process: catalyst used
Vanadium oxide ()
Industrial use of Le Chatelier's Principle
Industrial use of Le Chatelier's Principle
Maximise production of desired products