* Compounds are formed by the chemical combination of two or more different elements. The elements lose their individual properties and form a new substance with unique properties.

* Chemical reactions involve the breaking and forming of chemical bonds. This rearranges atoms and creates new compounds.

Here are some examples:

* Water (H₂O): This compound is formed by the chemical reaction between hydrogen (H) and oxygen (O).

* Salt (NaCl): This compound is formed by the reaction of sodium (Na) and chlorine (Cl).

* Carbon dioxide (CO₂): This compound is formed by the reaction of carbon (C) and oxygen (O).

In summary: Chemical reactions are the foundation for creating compounds. They allow us to combine different elements in specific ways to create new substances with new properties.