(a) (i) Define the term decomposition reaction. Write one chemical equation each for decomposition reaction…
(a) (i) Define the term decomposition reaction. Write one chemical equation each for decomposition reaction where energy is supplied in the form of heat, light or electricity.
(ii) Decomposition of vegetable matter into compost is considered an exothermic reaction. Why ?
Solution
(a) (i) A single reactant (substance) breaks down to give two or more products.
• CaCO3 (s) —Heat→ CaO(s) + CO2(g)
• 2AgCl (s) —Sunlight→ 2Ag(s) + Cl2(g)
• 2H2O (l) —Electric Current→ 2H2(g) + O2(g)
(any other suitable example)
(ii) because energy (heat) is released.