Question

Why are the decomposition reaction called the opposite of combined reaction? Write one example for each

Answer 1

Decomposition:caco3 gives rise to cao+CO2
Combination:2c+2O2 gives rise to 2co2

Answer 2

it's is because in decomposition reaction a single product divides into two reactants

but in combination reaction two reactants group together to form a single product

ex decomposition
2h2o------2h2+o2
ex combination

ca+cl2------cacl2


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