When a scientist works out a chemical formula, each side of the equation must balance for it to be correct. This is one of the most basic ideas learned when studying chemistry, and it is a good way for students to be able to check their own work. Unfortunately, many students fail questions when they forget to follow this rule. Those who learn it will have an easier time advancing through a basic class, and they might be the students who will take it up when they attend a college or university.
Chemicals in solid or liquid form interact with each other, and much of the study of this subject is devoted to understanding the reactions that can be caused by mixing them. Differing amounts can create end products that vary widely, so there is much for the student to learn when attending a chemistry class. It is a subject that has become increasingly important as the world requires more advanced products.