Karteikarten
C2: The Haber process
Karten in diesem Stapel (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.
Informationen
- Beschreibung
- All information is sourced from the Collins revision textbook, GCSE OCR Gateway B Higher.
- Erstellt von
- Ella Maggs
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