Ⅰ First Steps in Chemistry
1 Chemistry and Our Life
2 Amount of substance and chemical reaction formula

Ⅱ The World of Atomics
1 Structure of an atom
Periodic properties of two elements

Ⅲ The World of Chemical Bonds and Molecules
1. Compound bond
Structure and properties of two molecules

Ⅳ Dynamic chemical reactions
1 Dynamic equilibrium in chemical reactions
2 Chemical reactions and heat input and output