Question

Write one equation each for decomposition reactions where energy is supplied in the form of (a) heat (b) light, and (c) electricity.

Answer 1

Answer:

Heat.......

caco3--heat->cao +co2

light.....

2agcl-----sunlight--->2ag +cl2

electricity/.........

2h20--------electicity------> 2h2 +o2

Decomposition reaction is a chemical reaction in which one reactant is converted to two or more than two products. The breaking of bonds require absorption of energy and thus all decomposition reactions are endothermic in nature.

Thermal decomposition is decomposition carried by using heat, Photo decomposition is decomposition carried by using light and Electrolytic decomposition is decomposition carried by using electricity.

Answer 2

Explanation:

Sunlight

AgCl ---------------> Ag + Cl

Electrolysis

H2O ---------------------> H2 +O2

∆(Heat)

CaCO3 -----------------> CaO + CO2