In the ball and stick models below, carbon atoms are black and hydrogen atoms are white.
Crude oil is a finite resource because it is made extremely slowly over millions of years, or is no longer being made. However, crude oil is an important source of:
A feedstock is a raw material used to provide reactants for an industrial reaction. A petrochemical is a substance made from crude oil using chemical reactions. For example, ethene is produced from crude oil. It is used as feedstock to make poly(ethene), a polymer.