Ammonia and the Haber Process

Ammonia is a molecule that is made out of four atoms: three of the atoms are hydrogen atoms and they are all joined to a nitrogen atom.

The spinning molecule shown here gives us an idea of what the ammonia molecule is like ... the white balls stand for the hydrogen atoms and the middle, blue ball represents the nitrogen atom.

Ammonia is used to make chemical fertilisers for use on farms and gardens


Now fill in these missing words ...

Ammonia is a that is made out of four . Three of the atoms are atoms and the final, fourth atom is a atom.
Ammonia is used in the manufacture of for use on farms.

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The Haber Process


Ammonia is a very useful chemical but, for many years, people couldn't make large amounts of it.

Then, in 1908, a chemist called Fritz Haber invented a process for manufacturing ammonia on a large scale. That process is called the Haber Process after its inventor.

If nitrogen and hydrogen are mixed together in the right conditions they will react to form ammonia.

The chemical reaction has to be carried out at 450oC with the pressure at 200 times the normal air pressure.

Finally, the reaction needs a catalyst of iron to make it work.

Most of the Nitrogen and Hydrogen gas aren't used at first so they are put into the reaction vessel again and again until they are all used up. The chemical equation for the reaction is this:

N2 + 3H2 = 2NH3


Use the diagram and writing to answer these questions ...

The Ammonia is made out of how many atoms ?

How many Hydrogen atoms are there in an ammonium molecule ?

How many Nitrogen atoms are there in an ammonium molecule ?

Pick the most common use of ammonia ?

Who invented the Haber Process ?

What does the Haber process produce ?

What temperature (in oC) is the reaction ?

What about the pressure inside the reaction vessel ?

What type of catalyst is used ?

What happens to the gases that aren't used first time ?

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