Give two examples of obtaining oxides by decomposition of complex substances and combustion of substances. Write the reaction equations.

Obtaining oxides by decomposition of complex substances:
Cu (OH) 2 = CuO + H2O
CaCO3 = CaO + CO2
Obtaining oxides by burning substances:
S + O2 = SO2,
2ZnS + 3O2 = 2ZnO + 2SO2

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