CHE 233 Final UKY Questions With Complete Solutions

Unsaturated fatty acids - have one or more C=C bonds Saturated fatty acids - Have no C=C bonds What are the ways that biodiesel is produced commercially? Which method is the predominant method? - 1) Base-catalyzed transesterification of the oil with methanol and one used in lab. 2)Acid-catalyzed esterification of the oil with methanol 3) Saponification of the oil to yield free fatty acids, followed by acid catalyzed esterification. Match the products and catalyst for the following transesterification reaction. - R groups are switched from products to reactants and catalyzed by an acid or base. FAMEs - fatty acid methyl esters NMR - nuclear magnetic resonance Biodiesel limiting reagent - Triglyceride Biodiesel excess reagent - methanol The excess reagent in this Biodiesel reaction is required to shift the equilibrium to the right? T/F - T The addition of water to sodium methoxide produces... - Methanol and Sodium Hydroxide How will you characterize the product in this Biodiesel experiment? What specific differences will you be looking for? - 1H-NMR of the FAMEs produced. How is Le-Chatelier's principle applicable to the transesterification reaction in the preparation of FAMEs? - In the preparation of FAMEs, there is a large amount of alcohol that is used to shift equilibrium to the products that will then increase the percent yield for the product. Chemical Waste in biodiesel lab - Glycerol and FAMEs are generated and disposed in the organic liquid hazardous chemical waste. What is the purpose of adding base in the aldol condensation reaction? - Deprotonate αlpha-carbon to generate nucleophile Hexynide lithium reacts with 6,13-pentacenequinone via: -