a science that deals with the composition, structure, and properties of substances and of the transformations they undergo
Chemistry is divided into several branches. Physical chemistry deals with the principles of chemistry and its basis in physics. Organic chemistry deals with the structures and reactions of compounds of carbon; inorganic chemistry with the properties of all the other elements. Biochemistry deals with the compounds and reactions that participate in the processes of life. These divisions are becoming increasingly blurred — Professor Peter Atkins
an instinctive affinity or attraction between people
the composition and chemical properties of a substance
chemical processes and phenomena, e.g. of an organism
blood chemistry
the complex nature of a relationship, feeling, phenomenon, etc, esp seen as inexplicable or instinctive