Question

classify the following reactions are endothermic and exothermic reaction:- 1) Electrolysis of water
2) burning of natural gas.
3) decomposition of calcium carbonate.
4)burning of magnesium ribbon in air

Answer 1

1 and 4 are endothermic reaction and other two are exothermic reaction

Answer 2

Endothermic :- involve heat

Exothermic :- Evolve heat

1 ) Endothermic Coz , Electricity as heat is needed.

2 ) Exothermic Coz , heat is released while burning Natural gas.

3 ) Endothermic Coz, Heat is needed to break down.

4 ) Exothermic Coz , While reacting with oxygen it release heat .