Undergo Chemical Change can be defined as a process in which one or more substances are changed into one or more new substances. The term is often used in chemistry to describe a chemical reaction, which is a process that involves the rearrangement of atoms and molecules. In this crossword, the solution for the term Undergo Chemical Change is 'REACT', which is an appropriate term to describe the process. Reacting is the action of undergoing a chemical change, and it is the result of a chemical reaction.