. What are exothermic and endothermic reactions? Give examples.

Best Answer

Exothermic reactions--- The reactions in which heat is evolved along with the products are known as exothermic reactions.

For example: (1) burning of natural gas.

CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g) + Heat 

Endothermic reactions--- The reactions in which heat is absorbed are known as Endothermic reactions.

For example--- (1) Formation of carbon disulphide 

     C   +          S      + Heat           →            CS₂     

  Carbon     Sulphur                                      Carbondi –Sulphide