What is the difference between a chemist and a chemical engineer?

Each year, the American Chemical Society does a salary survey. The results of this year's survey were published in the June 4 edition of Chemical and Engineering News. Here is their data for the median annual salary of people who graduated in 2011 with full time employment with several levels of education:

B.S./B.A.: Chemists $36,000, Chemical Engineers $65,000

M.S.: Chemists $51,800, Chemical Engineers $77,000

Ph.D.: Chemists $75,000, Chemical Engineers $92,800