Pure Chemistry and Applied Chemistry are related, they have very unique differences. The ability to study something for your own knowledge benefit is pure chemistry. On the other hand the process of using your knowledge for an intended purpose or application is applied chemistry. Generally a substance is pure if it has a homogeneous chemical composition in Chemistry. Iron, steel, and water are the examples of pure substances. Applied Chemistry has four areas of study: physical chemistry, materials chemistry, chemical engineering, and environmental chemistry. In general the manufacture of pharmaceuticals and drugs are examples of Applied Chemistry.