Choosing Reaction Conditions (AQA GCSE Chemistry): Flashcards
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Effect of lowering temp on ammonia yield
Effect of lowering temp on ammonia yield
Increases yield
Why lower temp increases ammonia yield
Why lower temp increases ammonia yield
Forward reaction is exothermic
Problem with too low temp in ammonia production
Problem with too low temp in ammonia production
Reduces reaction rate, lowers yield
Compromise temp for ammonia production
Compromise temp for ammonia production
450°C
Reason for 450°C compromise
Reason for 450°C compromise
Balances rate and yield
Effect of increasing pressure on ammonia
Effect of increasing pressure on ammonia
Favours ammonia production
Moles: ammonia side vs reactants
Moles: ammonia side vs reactants
2 moles vs 4 moles
Why pressure increase favours ammonia
Why pressure increase favours ammonia
Shifts to side with fewer moles
Compromise pressure for ammonia
Compromise pressure for ammonia
200 atm
Why not use very high pressure?
Why not use very high pressure?
Expensive to maintain
Optimised conditions for ammonia
Optimised conditions for ammonia
450°C and 200 atm
Goal of optimised conditions
Goal of optimised conditions
Maximise production efficiently and economically