Here's why:
* Chemical reactions involve the rearrangement of atoms: The original substances break apart, and their atoms recombine in new ways to form different molecules.
* New substances have different properties: The products of a chemical reaction have different physical and chemical properties compared to the reactants.
* Energy is involved: Chemical reactions either release energy (exothermic) or require energy input (endothermic).
Examples of chemical reactions:
* Burning wood (combustion)
* Baking a cake
* Rusting of iron
* Photosynthesis in plants
Let me know if you have any other questions!
