🎯 Common Question Types:
- "State the conditions" — name temperature, pressure, catalyst (3 marks)
- "Explain why 450°C is used" — rate vs yield compromise (2 marks)
- "Explain the effect of increasing pressure" — Le Chatelier + economic reason (2 marks)
- "State one use of ammonia" — fertilisers (1 mark)
📝 Key Command Words:
- State: Give a fact with no explanation needed
- Explain: Give a reason — always address both rate AND equilibrium/yield in Haber questions
- Describe: Give the key features of the process
⚠️ Common Mistakes to Avoid:
- Saying "the catalyst increases yield" — it only increases rate
- Forgetting to mention recycling of unreacted gases
- Saying hydrogen comes from air — nitrogen comes from air, hydrogen from methane/natural gas
- Not explaining WHY the compromise exists — just saying "450°C is a compromise" without explaining rate vs yield
This exam tips covers Exam Tips within The Haber Process & Fertilisers for GCSE Chemistry. Revise The Haber Process & Fertilisers in Rates of Reaction for GCSE Chemistry with 6 exam-style questions and 6 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 12 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for The Haber Process & Fertilisers
In the Haber process, where is the nitrogen obtained from?
State the equation for the Haber process and give the conditions used. Include the catalyst.
Quick recall flashcards
State the three conditions used in the Haber process.
1. Temperature: ~450°C
2. Pressure: ~200 atmospheres
3. Catalyst: iron
Unreacted N₂ and H₂ are recycled.
Write the equation for the Haber process.
N₂ + 3H₂ ⇌ 2NH₃
The ⇌ shows the reaction is reversible.
The forward reaction is exothermic.