Choosing Reaction Conditions (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards
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Effect of lowering temp on ammonia equilibrium (exothermic)
Effect of lowering temp on ammonia equilibrium (exothermic)
Shifts equilibrium towards ammonia production
Nature of forward reaction in ammonia production
Nature of forward reaction in ammonia production
Exothermic
Problem with very low temp in ammonia production
Problem with very low temp in ammonia production
Reduces reaction rate, decreasing overall yield
Compromise temperature used for ammonia production
Compromise temperature used for ammonia production
450°C
Purpose of compromise temp (450°C) in ammonia production
Purpose of compromise temp (450°C) in ammonia production
Balance reaction rate and yield
Effect of increasing pressure on ammonia equilibrium
Effect of increasing pressure on ammonia equilibrium
Shifts to side with fewer moles (ammonia side)
Moles of gas: ammonia side vs reactant side
Moles of gas: ammonia side vs reactant side
2 moles vs 4 moles
Effect of increased pressure on ammonia production
Effect of increased pressure on ammonia production
Favours ammonia production
Reason very high pressures not used for ammonia production
Reason very high pressures not used for ammonia production
Expensive to maintain
Compromise pressure used for ammonia production
Compromise pressure used for ammonia production
200 atm
Purpose of compromise pressure (200 atm) for ammonia
Purpose of compromise pressure (200 atm) for ammonia
Good yield while keeping costs manageable
Optimised conditions for ammonia production
Optimised conditions for ammonia production
450°C and 200 atm