Flashcards
C2: The Haber process
Cards in this deck (15)
- 1What is the symbol equation for the Haber process?N2 + 3H2 <--> 2NH3
- 2What is the word equation for the Haber process?nitrogen + hydrogen <--> ammonia
- 3What is ammonia used for?It is used for fertilisers.
- 4What is the optimum temperature?450C, which is reasonably low for a industrial process.
- 5What is the optimum pressure?200 atmospheres/ 20 MPa, this is quite high.
- 6Name two other optimum conditions.Use a iron catalyst, and recycle the unreacted hydrogen and nitrogen.
- 7Why are optimum conditions used?They make the process as efficient as possible, this meaning nothing is wasted and the process is cheap.
- 8What is percentage yield?A 100% yield means that no product has been lost, while a 0 per cent yield means that no product has been made. So, it means the percentage of product made from the materials.
- 9What does rate of reaction mean?This is the speed of how quickly the reaction happens.
- 10Why is a iron catalyst used?It increases the rate of reaction, but not the percentage yield.
- 11What does a high pressure do?It increases the the percentage yield of ammonia.
- 12A high temperature increases what?It increases the rate of reaction.
- 13A high temperature decreases what?The percentage yield.
- 14Why is the temperature 450c?It is a compromise, the best of a "bad balance". The yield is not high, but the the rate is fairly quick.
- 15Why do chemical plants not aim for the best yield?Costs increase when the temperature and pressure increase, this making it not cost effective. They aim for the best economical yield.
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- All information is sourced from the Collins revision textbook, GCSE OCR Gateway B Higher.
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- Georgia Bruyel
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- Created by Ella Maggs · Apr 30, 2016
- Copied by Georgia Bruyel · Feb 28, 2017
- Copied by Georgia Bruyel · Feb 28, 2017
- Copied by Georgia Bruyel · Feb 28, 2017
- Copied by Georgia Bruyel · Feb 28, 2017
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