This book presents in detail the chapters "Intermolecular Forces - States of Matter - Additive Properties", "Thermochemistry", "Chemical Kinetics" and "Chemical Equilibrium" of Chemistry for the 3rd Grade of High School, Orientation Group of Positive Sciences and Health Studies. The structure of the school book is faithfully followed.

It contains:
- Detailed theory for a complete understanding of the material.
- Theory questions with the correct answer, which cover the "difficult points" of the 2nd topic of the Panhellenic exams.
- Multiple choice questions with justification for the theory, according to the 1st and 2nd topic of the Panhellenic exams, for the student to answer.
- Basic exercises solved exemplarily according to the corresponding methodology.
- Exercises and problems for solving, whose quantity and diversity ensure the proper preparation of the student.
- Tests after each section of the chapter, according to the topics of the Panhellenic exams.
- Combined topics in the sections being examined.
- Appendix with the answers to all the topics.

The great advantage of this work is that it exhausts the material of the 2020-2021 school year required by the detailed program and thus is within the philosophy of the Panhellenic exams without, however, expanding into details that tire the student and the teacher and that in reality concern another educational level.