rusting of ironcombustion (burning) of woodmetabolism of food in the bodymixing an acid and a base, such as hydrochloric acid (HCl) andsodium hydroxide (NaOH)cooking an eggdigesting sugar with the amylase in salivamixing baking soda and vinegar to produce carbon dioxide gasbaking a cakeelectroplating a metalusing a chemical batteryexplosion of fireworksrotting bananasgrilling a hamburgermilk going sour