This book provides an important opportunity for students to learn some of the complicated concepts of chemistry and understand how those concepts make easy. I strive to make chemistry, as a discipline, interesting and accessible to students. With this objective in mind, the content of this book has been developed and arranged to provide a logical progression of the fundamental concepts of chemical science. Topics are introduced within the context of familiar experiences whenever possible, treated with an appropriate rigor to satisfy the intellect of the learner, and reinforced in subsequent discussions of related content. Introduction to Chemistry book adheres to the scope and sequence of most of the chemistry courses. This book intended to help the student of physical chemistry clarify his concept by solving problems, which can not be satisfactorily done in the textbook. Each chapter begins with a brief introduction to the topic, laying special emphasis on mathematical relationship and some problems have been solved to illustrate the subject. This is then followed by exercises. In the study of physical chemistry complicated concepts better be clarified in this book.