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Unformatted text preview: 1) Pure Organic molecules has which of the following? a. broad melting range. b. low melting point. c. narrow melting range. d. eutectic point 2) A 3mL sample of chlorobenzene weighs 3.321g. What is the density? a. 0.90 b. 1.107 c. 9.963 d. 6.321 3) If benzoic acid is added into a Fask containing aqueous acid and diethyl- ether, where will it reside? a. aqueous acid layer b. precipitate at the bottom c. diethyl ether layer d. dichloromethane layer 4) If ethyl 4-amino benzoate is added into a Fask containing aqueous acid and diethyl-ether, which layer will it mostly be in? a. aqueous acid layer b. precipitate at the bottom c. ethyl ether layer d. dichloromethane layer 5) Ethyl 4-amino benzoate contains which type of functional group(s)? a. acidic b. basic c. aqueous d. it has no functional groups 6) A Vigreux column is used for what type of purication? a. sublimation b. liquid/liquid extraction c. simple distillation d. fractional distillation 7) A separatory funnel is used for what technique? a. distillation b. sublimation c. liquid extraction d. condensation 8) At 20 degrees C the velocity of light is 3 x 10 8 m/s. In diiodomethane the ve- locity of light is 1.72 x 10 8 m/s. What is the refractive index of diiodomethane? a. 1.35 b. 1.58 c. 0.825 d. 1.74 9) Sublimation involves a change of what states? a. solid to liquid b. solid to gas c. gas to liquid d. liquid to gas 10) Refractive index is important to or- ganic chemist, because? a. it allows one to calculate density b. it accounts for light bending c. it can be used to identify sub- stances d. it sounds cool Chemistry and Biochemistry page 1 of 6 Chem 6a University of California at Santa Barbara, Name of TA Student Name Quiz 11) A sharp and narrow melting point range is observed: a. When the compound is pure b. When the compound is impure c. At the eutectic point d. a and c. 12) Which item was not used in the dis- tillation set-up: a. Round-bottomed fask b. Boiling chip c. Claisen adapter d. Condenser 13) Which item is not considered a dry- ing agent: a. Sodium sulFate b. Sodium hydroxide c. Calcium chloride d. Molecular sieves 14) Sublimation is a technique used to: a. PuriFy liquids b. PuriFy solids c. PuriFy gases d. None oF the above 15) Circle the compound that is least soluble in water: a. RNH3+ Cl- b. RCOO- Na+ c. RCOOH d. NaCl 16) What apparatus is used For liquid-...
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- Fall '05