Week 6 of the Science Enrichment Program covered inorganic chemistry, the study of the chemical reactions and behavior of inorganic and organometallic compounds. The students learned that inorganic chemical compounds do not contain carbon, but instead are primarily composed of transition metals (e.g. platinum), alkali earth metals (e.g. calcium), and alkali metals (e.g. sodium). The students learned that organometallic compounds contain carbon and a metal and are commonly used as catalysts for chemical reactions. The importance of inorganic chemistry was demonstrated by providing examples of the many important chemical compounds inorganic chemists help create that are critically important to our high standard of living: rubber, plastics, fuel additives, lubricants, medicines, cosmetics, dyes, agrichemicals, detergents, and coatings. For the hands-on activities, we performed an electrochemical reaction during which the iron in a metal spoon was dissolved by passing electrical current from a 9 volt battery through the spoon and the salt water solution in which it was suspended. The students observed the removal of copper oxides from tarnished pennies using vinegar and lemon juice to restore the currency to "mint" condition. Lastly, the students made Prussian blue pigment by reacting iron freed from vinegar-treated ammonium iron (III) sulfate with potassium hexacyanoferrate(II). These experiments demonstrated the various types of chemical reactions of the transition metals iron and copper.