Written at a level accessible to nonspecialists, including high-school students, college students in introductory courses, and the general public, this encyclopedia’s purpose is to assist users in acquiring knowledge and understanding of chemistry. The 509 alphabetically arranged, signed articles were written by subject specialists and range from concise definitions to multiple-page overviews. Broad areas covered include analytical chemistry applications, biochemistry, biographies, elements, energy, environmental chemistry, medicine, organic chemistry, physical chemistry, reactions, states of matter, and structure.