I don't include all substances when I say compounds. Compounds are different from molecules. In molecules there are two or more atoms stuck together, that stay together, and act as one unit. Compounds don't have molecules.
In order to understand how compounds are formed and why they stay together you will need to know about how charges are created, how they interact with each other, and how they interact with other materials.
In addition it will be very helpful to know a few things about the periodic table so that it can be used to predict what compounds can be formed and what their formulas will be.
The lessons in this section are: