Chemistry
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The Haber process is the manufacture of what? | Ammonia
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| what two elements are needed to create ammonia? | nitrogen and hydrogen
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| How can nitrogen be obtained? | from the air.
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| how can hydrogen be obtained? | from natural gas or the cracking of hydrocarbons
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| Is the reaction reversible or irreversible? | reversible
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| the equilibirum position can be shifted to the right hand side to produce a: | a high yield of ammonia
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| what conditions must be used in order to obtain a HIGH yield of ammonia? | low temperatures but high pressures
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| However, what's wrong with using low temperatures? | the reaction is very slow
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| so, what's the compromise to produce a high yield? | 450 degrees celcius
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| Also, what's wrong with using high pressures (and why)? | Very expensive as lots of energy would be required to compress the gases.
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| so, what's the compromise? | pressure of 200atms is used.
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| at 450 degrees, the reaction is still: | quite slow
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| UNLESS, | a catalyst is used
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| The most economical catalyst to use for this is what? | Iron
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| Under these conditions, what percentage of ammonia is obtained? | 15%
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| What happens to the remaining nitrogen and hydrogen? | it is reused in the reaction
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| what happens to the ammonia at the end of the reaction? | it leaves the reaction vessel, is cooled down, liquefied and is then tapped off.
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| 3 uses of ammonia? | the manufacture of fertilizers, nitric acid and nylon
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Created by:
eloiseis
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