A chemical reaction is a process in which one or more substances, which are the reactants, are converted to one or more different substances, which are the products. The substances in a chemical reaction are either chemical elements or compounds. There are different observations that indicate a chemical reaction has taken place. Formation of precipitate, which is a solid formed in a chemical reaction. Precipitate can take place when solutions containing ionic compounds are mixed and an insoluble product forms. An example is mixing is mixing silver nitrate and sodium chloride in water, which will cause silver chloride to precipitate out of the solution as a solid. Color change can also indicate a chemical reaction has taken place. An example
