The following are the indicators that there are chemical changes that took place:
Formation of a gas
* When gas bubbles are formed it is often a sign that a chemical reaction is taking place.
Formation of heat and light together
*When heat and light are given off together it is often a sign that a chemical reaction is taking place.
Formation of a precipitate
*A precipitate is a solid that appears after two liquids are mixed together.
Color change
Temperature change
