Answer:
Chemical reactions takes place
Step-by-step explanation:
Chemical energy stored in bonds of chemical compound are released when chemical reactions takes place. 
Chemical energy is a form of potential energy that is found in chemical bonds. 
- When chemical reactions occur, bonds are broken and formed again. 
- The process of breaking and forming new bonds releases chemical energy. 
- In this manner most chemical reactions are often accompanied by energy changes 
- The energy changes is due to the formation of new bonds.