chemical changes happen when chemical reactions occur. They involve the formation of new chemical elements or compounds. Physical properties close physical propertyA property of an element or ...

Physical chemists are focused on understanding the physical properties of atoms and molecules, the way chemical reactions work, and what these properties reveal. Their discoveries are based on ...

since no other compound possesses such an array of interesting physical properties, even if we leave out of account all its chemical reactions. A precedent for monographs of this type has been set ...