What I have learne Chemical equation is a written representation using symbols and numbers of the process that occurs in a chemical also a chemical change that involves the production of a new substances. A chemical reaction has five types namely of substances to form a compound, compound, combustion is a reaction with replacement where a free element compound, and finally a reaction where there is an exchange of ions in the compounds that react in must always be balanced to attain the law of conservation of mass. a break down of single an element from a a A chemical equation​