4. Change the following in to chemical equations and balance them.
a) Hydrogen gas combines with nitrogen to form ammonia.
b) Potassium reacts with water to give potassium hydroxide and hydrogen gas.
c) Aluminium metal reacts with ferric oxide giving aluminium oxide and iron.
d) Ferric oxide reacts with aluminum metal to form aluminum oxide and iron.
e) Barium hydroxide reacts with hydrogen bromide to give barium bromide and water.
f) Calcium carbonate on heating gives calcium oxide and carbon dioxide.
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