Chemistry is a branch of science which studies the composition, structure, and properties of all the matter around us. Chemistry is an umbrella discipline which comprises of organic chemistry, inorganic chemistry, physical chemistry, biochemistry and many other subfields. Modern day chemistry is much more advanced; it finds its applications in many areas such as, manufacturing of dyes, medicines, fertilizers, detergents, preservatives, etc. This book traces the progress of this field and highlights some of its key concepts and applications. For all those who are interested in learning the concepts of chemistry, it will prove to be an essential guide. This book aims to serve as a valuable source of reference for engineers, scholars, researchers and students across the globe.