Chemical Change

Read the "Chemical Change", "Energetics of Chemical Change", and "Dynamics of Chemical Change" sections. The energetics of chemical change will be discussed more thoroughly in Unit 6. To determine if you are dealing with a physical or chemical change, ask yourself if you can reverse the process to recover the original material. For example, ice melting is a physical change because you can re-freeze the water; however, cooking a steak is a chemical change because you cannot recover the raw meat.