Chemical Change Examples

Examples of chemical changes

ThoughtCo. / Hugo Lin

Chemical changes involve chemical reactions and the creation of new products. Typically, a chemical change is irreversible. In contrast, physical changes do not form new products and are reversible.

Common Chemical Changes

  • The rusting of iron
  • Combustion (burning) of wood
  • The metabolism of food in the body
  • Mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)
  • Cooking an egg
  • Digesting sugar with the amylase in saliva
  • Mixing baking soda and vinegar to produce carbon dioxide gas
  • Baking a cake
  • Electroplating a metal
  • Using a chemical battery
  • The explosion of fireworks
  • Rotting bananas
  • Grilling a hamburger
  • Milk going sour

While it's not always easy to tell a chemical change has occurred (as opposed to a physical change), there are some telltale signs. Chemical changes may cause a substance to:

  • Change color
  • Change temperature
  • Produce bubbles
  • Produce precipitate (in liquids)

Chemical changes can also be considered to be any phenomenon that allows a scientist to measure chemical properties.