Chemical reactions happen when one atom is added to or removed from another atom. Organic molecules are made of atoms of carbon, hydrogen, oxygen, and nitrogen. Inorganic molecules contain atoms from different chemical elements. Organic chemicals include fat, amino acids, sugars, nucleic acids, proteins, and other organic substances that form the basic building blocks of living organisms.

Organic chemicals are the raw materials of all living cells and organisms. Inorganic chemicals are used in industry to create a variety of things including fertilizers, pesticides, dyes, and drugs. Most drugs used to treat humans are synthetic and have been created with the help Inorganic chemicals of inorganic chemistry.

Organic chemicals, including fats, proteins, sugars, and nucleic acids are the building blocks of all living organisms. The organic molecules found in living cells are made of carbon, hydrogen, oxygen, and nitrogen atoms. Most drugs are man-made and are organic in nature. Pharmaceutical companies create drugs by chemically combining small organic molecules called chemical compounds. These compounds are the basic building blocks of the new chemical drugs. There are two main reasons why pharmaceutical companies make drugs using organic chemistry. First, it is cheaper to produce large quantities of a drug than it is to produce a smaller amount. Second, organic chemistry has a long history of being used for synthesizing drugs.