Question

define a chemical reaction. state for observations which help us to determine that a chemical reaction has taken place write one example of each observation with a balanced chemical equation

Answer 1

chemical reaction is occur when two reactive metal are react each other and form new product and balance chemical reaction is defined as when the atoms of reactant equal to atom of product example h2+o2=2h2o. Mey be it help you dear

Answer 2

Chemical reaction is a reaction that occurs when one metal or chemical reacts with other chemical or metal.