Question

What chemical reactions release energy?

Answer 1

Answer:

Explanation:Exothermic reactions

Ex:- nuclear fission, Reaction of zinc with H2SO4

Answer 2

All the exothermic reactions involve release of energy in the form of heat.

Some reactions such as of combustion involve heat and light both which are a form of energy.

For ex: 1) CaO+ H2O-------> Ca(OH)2+ HEAT

            2) 2C2H6+ 7O2--------> 4CO2+ 6H2O+ HEAT + LIGHT