This course presents the fundamental concepts of general chemistry, organic chemistry, and biochemistry. It covers the structure of matter, chemical bonds, chemical reactions, and the properties and reactivity of the main organic compounds. The biochemistry section focuses on the chemical composition of living organisms, biomolecules (carbohydrates, lipids, proteins, and nucleic acids), enzymes, and the main metabolic pathways. This course provides the necessary foundation for understanding chemical and biological phenomena in the fields of health, biology, and applied sciences.