Write the balanced chemical equations for the following reactions:
(a) Calcium hydroxide + Carbon dioxide 
Calcium carbonate + Water
(b) Aluminium + Copper chloride 
Aluminium chloride + Copper
(a) Ca(OH)2 +CO2 = CaCO3 + H2O
Calcium hydroxide reacts with Carbon dioxide to give Calcium carbonate and water.
(b) 2Al + 3CuCl2
2AlCl3 + 3Cu
2 moles of aluminum reacts with 3 moles of Copper chloride to give 2 Aluminum chloride and 3 copper element.
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