Q5 of 35 Page 42

Write an equation for decomposition reaction where energy is supplied in the form of teat/ light/ electricity. (AS1)

On heating calcium carbonate, it decomposes to calcium oxide and carbon dioxide. The reaction is:

CaCO3→ CaO + CO2


The above reaction is an example of thermal decomposition reaction in which decomposition take places in the presence of heat.


Note: Decomposition reaction is a reaction in which only one reactant decomposes into two or more products.


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