Item SC101003: Bubbles of gas forming as a seashell is placed in vinegar is an example of a chemical reaction.

Which of the following is an example of a chemical reaction?

  1. A piece of wax melting and forming a liquid
  2. A piece of chalk making white marks on a chalkboard
  3. Bubbles of gas forming when a seashell is placed in vinegar
  4. A powder dissolving in hot water to make hot chocolate