Exothermic reactions

2.  In exothermic reaction the heat is released
along with the formation of products.
 Ex:-
Zn+2HCl ZnCl22 H2+Heat
2Mg+O2 2 MgO +Energy

3. Making
Of Ice

4. Formation Of
Snow In Clouds

9.  An reaction accompled by absorption of heat
energy is known as endothermic reaction.