Chemical reactions are the interactions between chemicals that result in the formation of new compounds with differing properties. Simply said, a chemical reaction is the process of transforming reactants into products. The chemical characteristics of an element or compound—the ways in which a compound or element experiences changes in composition—determine how chemicals react. Chemical reactions occur all the time in our environment; everything from an iron fence rusting to a human cell's metabolic pathways are examples of chemical reactions.
Reaction Engineering explains the ideas and models of reaction engineering in a simple and concise manner, then applies them to real-world reactor construction. Chemical reaction engineering is concerned with the reactions that take place in chemical reactors. It's a branch of engineering that looks at the rates and mechanisms of chemical reactions, as well as the design of the reactors in which they occur.