Making Ammonia Flashcards
What are the raw materials for the Haber process?
Nitrogen and hydrogen
Where is nitrogen obtained from?
The air
Where is the hydrogen obtained from?
Natural gas or other sources
What is the catalyst made from that the purified gases are passed over?
Iron
What conditions are the purified gases passed over the iron catalyst at?
High temperature (450oc) and high pressure (200 atmospheres)
Why doesn’t all of the nitrogen and hydrogen react to form ammonia?
The reaction is reversible so ammonia breaks down again into hydrogen ans nitrogen
On cooling, ammonia…
Liquefies, so it can be removed
What happens to any remain nitrogen and hydrogen?
They’re recycled
When a reversible reaction occurs in a closed system, equilibrium is reached when…
The reactions occur at exactly the same rate in each direction
What do the relative amounts of all the reacting substances depend on?
The conditions of the reaction
When the temperature is raised, the yield from the endothermic reaction…
Increases
When the temperature is raised, the yield from the exothermic reaction…
Decreases
If the temperature is lowered, the yield from the endothermic reaction…
Decreases
If the temperature is lowered, the yield from the exothermic reaction…
Increases
In gaseous reactions, what will an increase in pressure favour?
The reaction that produces the least number of molecules (shown in the symbol equation)
