GCSE Chemistry Haber process 6 mark question

Last updated 12 months ago

3 questions

Ammonia is manufactured from nitrogen and hydrogen by the Haber process:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
The forward reaction is exothermic.
The conditions used in the Haber process are:
- 200 atmospheres pressure
- 450 °C
- iron catalyst
Use the equation and your knowledge of reversible reactions to explain why these conditions are used in the Haber process. To get full marks, you must consider both yield and rate of reaction in your answer.

200 atmospheres pressure 
• high pressure gives a _________  yield of ammonia.
• 4 moles of gas become 2 (or __________  moles of gas in products) 
• high pressure ___________  to maintain 
• a higher pressure will cause the rate to be ___________
• _________  particles in same volume  so more _____________collisions. 

Other Answer Choices:

costly

frequent

higher

fewer

More

high

Ammonia is manufactured from nitrogen and hydrogen by the Haber process:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
The forward reaction is exothermic.
The conditions used in the Haber process are:
- 200 atmospheres pressure
- 450 °C
- iron catalyst
Use the equation and your knowledge of reversible reactions to explain why these conditions are used in the Haber process. To get full marks, you must consider both yield and rate of reaction in your answer.
450 °C
high temperature ______________  the rate of reaction
•   particles are moving faster so there are more _____________collisions. 
•   The particles have more ____________ energy so a greater proportion of the collisions exceed the _______________  energy and are successful.
forward reaction is _______________  so a high yield of ammonia requires a ________  temperature
450 °C is a compromise temperature 
Too low a temperature causes the _________  of reaction to be too slow and too high a temperature causes the __________  to be too low.

Other Answer Choices:

yield

exothermic

kinetic

rate

low

activation

frequent

increases

Ammonia is manufactured from nitrogen and hydrogen by the Haber process: 
N₂(g) + 3H₂(g) ⇌ 2NH₃(g) The forward reaction is exothermic. 

The conditions used in the Haber process are:
200 atmospheres pressure
450 °C
iron catalyst 
iron catalyst 
• a catalyst ___________  up the reaction (by providing an ________________  pathway of lower _______________  energy so that a greater proprtion of the collisions exceed the activation energy so there are more _____________sucssful collisions)
• an iron catalyst allows a __________  temperature to be used (saving energy and so is more ________________ )
• iron catalyst increases the rate of reaction equally in both reactions so does not affect the __________  (allows equilibrium to be achieved more quickly).
Note the  underacted nitrogen and hydrogen is recycled separated using fractional distillation which improves the sustainability