The scientific study of the character and composition of elements and compounds whether metallic, non-metallic, organic or inorganic is called chemistry. It studies the changes in their structure, behavior and properties whenever they undergo a chemical reaction. The study of energy and entropy is crucial in chemistry as it helps in determining the state of a reaction. Chemical substances involved in these reactions are classified on the basis of their structure, phase and composition. The discipline of chemistry is further divided into various branches such as organic chemistry, inorganic chemistry, nuclear chemistry and analytical chemistry. Different approaches, evaluations and methodologies have been included in this book. It is a valuable compilation of topics, ranging from the basic to the most complex theories and principles in the field of chemistry. For someone with an interest and eye for detail, this book covers the most significant topics in the field of chemistry.