CHE 233 Lab Final Exam| 241 Questions| With Complete Solutions

a domestic, renewable fuel for diesel engines derived from natural oils like soybean oil, and which meets certain requirements specified by international standards correct answer: general definition of biodiesel a fuel comprising of long-chain fatty acid methyl esters (FAMEs) derived from vegetable oils or animal fats, designated B100 and meeting standard requirements correct answer: technical definition of biodiesel what are the three commercial methods for making fatty acid methyl esters (FAMEs)? correct answer: -base-catalyzed transesterification of the oil with methanol -acid-catalyzed esterification of the oil with methanol -saponification of the oil to yield free fatty acids, followed by acid catalyzed esterification what commercial method did we use in biodiesel lab? correct answer: base-catalyzed transesterification of the oil with methanol carboxylic acids whose unbranched non polar hydrocarbon R-group is 8-18 carbon atoms long correct answer: fatty acids how long are the fatty acids found in common cooking oils such as canola, olive, and vegetable oil? correct answer: 16-20 carbons long what type of fatty acid has one or more C=C bond in the chain? correct answer: unsaturated true or false: naturally occurring unsaturated fats usually contain Z (cis) C=C bonds, and artificial transfers contain E (trans) C=C bonds. correct answer: true type of fatty acids that do NOT have C=C bonds in the chain correct answer: saturated fatty acids fatty acids follow this rule for unsaturation correct answer: CnHn+2 name the major component fatty acids in the plant oils that are used in the biodiesel experiment correct answer: a-linolenic, linoleic, oleic, and palmitic acids true or false: palmitic is an 18 carbon acid correct answer: false; palmitic is a 16-carbon acid, while the others contain 18 carbons how are triglycerides biosynthesized? correct answer: triglycerides are synthesized by phosphorylated glycerol and enzyme functionalized fatty acid esters how are triglycerides produced? correct answer: enzymatic transesterification true or false: base-catalyzed biodiesel production utilizes transesterification correct answer: true definition: transformation of an ester into another ester through interchange of the alkoxy group correct answer: transesterification starting materials in transesterification correct answer: ester and alcohol true or false: tranesterification is an irreversible process correct answer: false; transesterification is a reversible process. it is also a slow reaction.