Open main menu

Changes

Haber Process

3,708 bytes added, 22:28, 3 September 2020
no edit summary
===About the Haber Process===
{{#ev:youtube|https://www.youtube.com/watch?v=o1_D4FscMnU}}: In the [[Haber Process]] [[Nitrogen]] and [[Hydrogen]] [[gas]] are passed over an [[Iron]] [[catalyst]] at 450°C and a [[Pressure]] of 20,200,000[[Pascal|Pa]] (200 times normal [[Atmospheric Pressure|atmospheric pressure]]).
: The [[Chemical Reaction|reaction]] in the [[Haber Process]] is a [[Reversible Reaction|reversible reaction]]:
Hydrogen + Nitrogen ⇌ Ammonia
<chemmath> 3H23H_2(g) + N2N_2(g) <=> 2NH3⇌ 2NH_3(g) </chemmath>: The [[Chemical Reaction|reaction]] in the [[Haber Process]] will reach a state of [[Dynamic Equilibrium|dynamic equilibrium]] with an [[Equilibrium Position(Chemistry)|equilibrium position]] which can be changed by altering the [[temperature]] or [[pressure]] of the [[Reaction Mixture|reaction mixture]].
: The [[Yield (Chemistry)|yield]] can be improved by increasing the [[pressure]] inside the [[Reaction Vessel|reaction vessel]] which favours the forward [[Chemical Reaction|forward reaction]].
: The [[Haber Process]] is essential to modern [[agriculture]] as it produces [[Nitrogen]] based [[fertiliser]]s for [[crop]]scrops. Without this the [[soil]] would run out of [[Nitrate]]s and [[plant]]s would not longer be able to [[growth|grow]].===(Higher) Iron Catalyst and the Haber Process===: The [[Iron]] [[catalyst]] increases the [[Rate of Reaction|rate of reaction]].: However, this works for both the [[Forward Reaction|forward]] and [[Back Reaction|back reaction]] so it does not affect the [[Equilibrium Position (Chemistry)|equilibrium position]].
===(Higher) Pressure and the Haber Process===: Using the [[Balanced Symbol Equation|balanced symbol equation]] for this [[Chemical Reaction|reaction]]:: <chemmath> 3H23H_2(g) + N2N_2(g) <=> 2NH3⇌ 2NH_3(g) </chemmath>: It can be seen that 4 [[Mole]]s of [[reactant]]s is needed to [[product|produce]] 2 [[Mole]]s of [[product]]s. This means a higher [[pressure]] will force the [[Equilibrium Position(Chemistry)|equilibrium position]] to favour the [[product]]s over the [[reactant]]s as they take up less [[Volume (Space)|volume]].
===(Higher) Temperature and the Haber Process===: The [[temperature]] affects both the [[Rate of Reaction|rate of reaction]] and the [[Equilibrium Position(Chemistry)|equilibrium position]].
: A higher [[temperature]] increases the [[Rate of Reaction|rate of reaction]] because it causes the [[particle]]s of [[reactant]] to [[Collision Theory|collide]] more frequently.
: A higher [[temperature]] favours the [[Back Reaction|back reaction]] because the [[Forward Reaction|forward reaction]] is [[exothermic]] and the [[Back Reaction|back reaction]] is [[endothermic]].
: To optimise the [[Rate of Reaction|rate of reaction]] and the [[Forward Reaction|forward reaction]] the optimum [[temperature]] is 450°C. This [[temperature]] [[product|produces]] the best [[Yield (Chemistry)|yield]] in the shortest [[time]].
 
===References===
====AQA====
 
:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d149 ''Haber process, page 104, GCSE Chemistry; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Haber process, pages 119, 228-231, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Haber process, pages 266-7, GCSE Chemistry, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Haber process, pages 301-303, GCSE Chemistry, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Haber process, pages 49, 209, 211, 215, 217, 219, 323, 344-5, 347, 349, GCSE Chemistry; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Nitrogen, Haber process, pages 119, 228-231, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']
 
====Edexcel====
 
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Haber process, page 121, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Haber process, pages 120-121, GCSE Chemistry, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Haber process, pages 169, 201-203, '']
:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Haber process, pages 59, 68, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']
 
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Haber process, page 80, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Haber process, pages 196, 200-201, Gateway GCSE Chemistry, Oxford, OCR '']