Chemistry - 15 Using Our Resources - 15.5 Making Ammonia - the Haber Process & 15.6 The Economics of the Haber Process
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18 Terms
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Haber process
industrial process for producing ammonia
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What are the reactants of the Haber process? [2]
- nitrogen
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What are the conditions for the Haber process? [3]
iron catalyst
450°C temperature
200 atmospheres pressure
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Why do plants need nitrogen?
to make proteins for growth
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Why can't plants absorb N₂ from the air?
it is insoluble in water
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What form do plants absorb nitrogen in? [2]
through the roots
soluble ions
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Haber process symbol equation
N₂ + 3H₂ ⇌ 2NH₃
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What does the yield of ammonia depend on? [2]
temperature
pressure
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The forward reaction of the Haber process is (exothermic/endothermic)
exothermic
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Where is the hydrogen for the Haber process obtained?
from reacting methane (CH₄) from natural gas with steam at a very high temperature
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Obtaining hydrogen from methane word equation:
methane + steam → hydrogen + carbon monoxide
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Where is the nitrogen for the Haber process obtained?
from the air
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Haber process [5]
nitrogen and hydrogen are pumped in
they are compressed and heated in a compressor
they are pumped through iron catalyst beds
ammonia
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extra hydrogen and nitrogen are recycled through a reflux tube
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Ideal conditions for maximum yield in Haber process [2]:
low temperature
very high pressure
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Why is a low temperature NOT used in the Haber process
and what is done instead? [2]
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Why is a very high pressure NOT used in the Haber process
and what is done instead? [2]
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What is the function of the iron catalyst?
increases the rate of the Haber process
Note 
Flashcards (185)