Question

Write one equation for decomposition reactions where energy is supplied in the form of heat.

Answer 1

1. \[\ce{\underset{Zinc carbonate}{ZnCO3_{(s)}} ->[\Delta]\underset{Zinc oxide}{ZnO_{(s)}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
2. \[\ce{\underset{(Limestone)}{\underset{Calcium carbonate}{CaCO3_{(s)}}} ->[heat] \underset{(Lime)}{\underset{Calcium oxide}{CaO_{(s)}}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
3. \[\ce{\underset{(Green colour)}{\underset{Ferrous sulphate}{2FeSO4_{(s)}}} ->[heat] \underset{(Brown colour)}{\underset{Ferric oxide}{Fe2O3_{(s)}}} + \underset{dioxide}{\underset{Sulphur}{SO2_{(g)}}} + \underset{trioxide}{\underset{Sulphur}{SO3_{(g)}}}}\]
4. \[\ce{\underset{Potassium chlorate}{2KClO3_{(s)}} ->[Heat][(Decomposition)] \underset{Potassium chloride}{2KCl_{(s)}} + \underset{Oxygen}{3O2_{(g)}}}\]
5. \[\ce{\underset{(Colourless)}{\underset{Lead nitrate}{2Pb(NO3)2_{(s)}}} ->[Heat][(Decomposition)] \underset{(Yellow)}{2PbO_{(s)}} + \underset{(Brown fumes)}{\underset{Nitrogen dioxide}{4NO2_{(g)}}} + \underset{Oxygen}{O2_{(g)}}}\]