Chemical Change Examples

Examples of chemical changes
Examples of chemical changes. Illustration by Hugo Lin. ThoughtCo.

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.

Some Common Chemical Changes

  1. The rusting of iron
  2. Combustion (burning) of wood
  3. The metabolism of food in the body
  4. Mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)
  5. Cooking an egg
  6. Digesting sugar with the amylase in saliva
  7. Mixing baking soda and vinegar to produce carbon dioxide gas
  8. Baking a cake
  9. Electroplating a metal
  10. Using a chemical battery
  11. The explosion of fireworks
  12. Rotting bananas
  13. Grilling a hamburger
  14. Milk going sour

Less-familiar chemical reactions are also examples of chemical changes. 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, or (in liquids) produce a precipitate. Chemical changes can also be considered to be any phenomenon that allows a scientist to measure chemical properties.