CHEM 335 Final Exam Questions and Answers Latest Update Already Passed

CHEM 335 Final Exam Questions and Answers Latest Update Already Passed In this lab, you will be using a separatory funnel and it is very important for you to understand what chemicals each layer in the funnel contains, and to know which layer is the aqueous layer and which is the organic layer. Which layer contains the majority of the product (the acetate ester) in this lab? The aqueous layer, which could be either upper or lower layer. You must test each layer while doing the experiment. The aqueous layer, which is the upper layer. The organic layer, which is the lower layer. The organic layer, which is the upper layer. The organic layer, which could be either upper or lower. You must test each layer while doing the experiment. - Answers Incorrect Incorrect Incorrect Incorrect Correct Suppose that in the synthesis of isoamyl acetate, a student began with 6.049 grams of acetic acid and 3.465 grams of isoamyl alcohol. If the mass of isoamyl acetate obtained were 4.914, what was the percent yield? - Answers 96.0233 Various chemicals are used in this procedure, and it is important that we the purpose of each. What is the reason for using magnesium sulfate? It is a drying agent used to dry the product. Incorrect It is a catalyst. It shifts the equilibrium to the right to favor the product. It aids in expelling the carbon dioxide. It removes the acetic acid. It is used in excess to ensure the equilibrium favors the product. - Answers Correct Incorrect Incorrect Incorrect Incorrect For a research project, the Fisher esterification was to be repeated with a number of different reagents, but all other conditions were to be constant, i.e. the same number of moles of alcohol was to be used for each reaction, but the alcohol used was to be different. Based on your knowledge of the reaction, fill in the blanks in the following proposed experiments. (Select G-Greater than, L-Less than, E-Equal to, N-Not able to determine). Using methanol would result in a percent yield (G,L,E,N) than using isoamyl alcohol. - Answers G For a research project, the Fisher esterification was to be repeated with a number of different reagents, but all other conditions were to be constant, i.e. the same number of moles of alcohol was to be used for each reaction, but the alcohol used was to be different. Based on your knowledge of the reaction, fill in the blanks in the following proposed experiments. (Select G-Greater than, L-Less than, E-Equal to, N-Not able to determine). Using 2-methyl-2-butanol would result in a percent yield (G,L,E,N) than using isoamyl alcohol. - Answers L For a research project, the Fisher esterification was to be repeated with a number of different reagents, but all other conditions were to be constant, i.e. the same number of moles of alcohol was to be used for each reaction, but the alcohol used was to be different. Based on your knowledge of the reaction, fill in the blanks in the following proposed experiments. (Select G-Greater than, L-Less than, E-Equal to, N-Not able to determine). Using 3-methyl-2-butanol would result in a percent yield (G,L,E,N) than using isoamyl alcohol - Answers L A Fisher esterification is performed with methanol and benzoic acid. All the oxygen atoms of the methanol are isotopically labelled oxygen-18 atoms, and none of the oxygen atoms of the benzoic acid are oxygen-18, i.e. in the benzoic acid all the oxygens are oxygen-16. Which of the following products would you expect from this reaction? Methyl benzoate, with both oxygens being oxygen-18. Phenyl acetate, with both oxygens being oxygen-16. Methyl benzoate, with both oxygens being oxygen-16.