The aim of this guide is not to be your teacher. Think of it as a road map. A way to navigate the world of chemistry and enjoy the scenery as you do so. And believe me, there is a lot to see. Atoms, the periodic table, chemical equations, acids, the Arrhenius theory; all these and many other concepts, as well as the minds behind them, are vital to understanding the world we inhabit. Our destination? Your success in the tests and exams that come your way. We want you to understand these concepts in a concise manner so that they are easy to remember. However, speeding by won't accomplish much with anything in life. This guide is structured for your knowledge of the topic to aggregate incrementally. The more you learn, the easier things become. Do not let the strange words and confusing equations cloud your mind. Take these chapters one by one, and enjoy the trip.