Why Chemical Reactions Release Energy

Chemical reactions release energy when bonds in molecules are broken and reformed.
Breaking bonds requires energy, but forming stronger bonds releases more.
If products have lower energy than reactants, the excess is released.
Exothermic reactions, like combustion, give off heat and sometimes light.
The energy comes from electrons moving to more stable arrangements.
Stored chemical energy in fuels is released during burning.
Even food releases energy when our bodies break down molecules.
Batteries release energy through controlled redox reactions.
Explosives release energy quickly because many weak bonds break at once.
Energy release drives engines, powers life, and fuels our modern world.