Here's why:
* Chemical reactions involve the rearrangement of atoms: When substances react, their atoms break and form new bonds, creating entirely new substances with different properties.
* New substances are formed: The products of a chemical reaction are chemically distinct from the reactants.
* Energy is involved: Chemical reactions either release energy (exothermic) or require energy (endothermic) to proceed.
Examples of chemical reactions:
* Burning wood: Wood (cellulose) reacts with oxygen to produce carbon dioxide, water, and heat.
* Baking a cake: Flour, sugar, eggs, and other ingredients undergo chemical changes when heated, forming a cake.
* Rusting iron: Iron reacts with oxygen and water to form iron oxide (rust).
Let me know if you want more details about specific types of chemical reactions!
