QUESTION 2 The condenser is wrapped with a moist pipe cleaner ... to aid in the condensation of the vapors during the reflux. to decorate the condenser column. to absorb any vapors that may escape during the reflux. to decrease the boiling point of the solvent. QUESTION 3 A reflux ... is used to evaporate a solution to dryness. allows sustained heating without the loss of volatile solvents. is used to purify liquids. cannot be done with a steam bath as the heat source. QUESTION 4 Given the following stoichiometric information for a generic reaction and that A is the limiting reagent, calculate the theoretical yield of E in moles. Reaction: 2A + B + C E + 2F Moles (mol) 0.125 0.100 0.075 ? 0.125 mole O 0.0625 mole O 0.250 mole O 0.075 mole QUESTION 5 If the theoretical yield in grams for the product of a reaction is 0.585 g and the actual yield is 0.404 g, what is the percent yield? O 69.1 % O 30.9 % O 14.5 % 40.8 % QUESTION 6 Given the following stoichiometric information for a generic reaction, determine which reagent A, B or C is limiting. Reaction 2 A B + с E + F Moles (mol) 0.158 0. 0973 0.150 Ο Α ов с O None are limiting. QUESTION 7 Identify whether each of the following statements are True or False with respect to 30% hydrogen peroxide (it may be helpful to refer to the MSDS information): It is flammable. A. True. It causes skin burns. B. False. It may be used at the lab benches. 4 It is destructive to mucous membranes. Alt poses a carcinogenic risk to humans. QUESTION 8 The phrase "in situ” means... O That the situation in which the chemical is used may be harmful. O That one must be sitting down when using this chemical. That the necessary reactant is produced in the reaction itself rather than added separately. None of the above. QUESTION 9 The Bromination of Stilbene experiment is "green" because... O a. The color of the product is green. ob. The reagents used are less toxic than other reactant typically used. c. The reagents are recycled and used again. O d. One of the products of the reaction is water. O Both b and d are correct. O Both a and care correct. QUESTION 10 The concentration of concentrated hydrobromic acid is... O 36% O 100% O 55% O 48%
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