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GCSE Chemistry · key term
A colourless, alkaline gas with the formula .
Used by AQA and Edexcel
Specification 4.10.4.1 · Paper 2
A compound of nitrogen and hydrogen with the formula NH₃, used to manufacture nitrogen-based fertilisers.
Revise: The Haber ProcessAmmonia is an important starting material for nitrogen-based fertilisers, which supply crops with nitrogen and can increase agricultural productivity.
Specification 4.15, 5.23C, 9.4C · Paper 1, Paper 2
A gas with the formula NH₃, formed when nitrogen reacts with hydrogen.
Revise: Formation of AmmoniaAmmonia is made by reacting nitrogen with hydrogen. The nitrogen is extracted from the air, while the hydrogen is obtained from natural gas. This industrial manufacture of ammonia is called the Haber process.
A colourless, basic gas with the formula .
When explaining pressure, compare the total gaseous coefficients: four moles of reactant gas form two moles of product gas, so higher pressure favours ammonia.
Do not claim that the catalyst increases the ammonia yield. It increases the rate and allows the system to approach equilibrium faster, but does not change the equilibrium position.
Use ⇌, not →, when writing the reversible reaction that forms ammonia.
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