OCHEM 1 LAB FINAL EXAM QUESTIONS
WITH VERIFIED ANSWERS
\.In the distillation experiment, the purpose of a fractionating column was to -
ANSWERS✔-Give a better separation for the mixture to be distilled
\.Which liquid would be most easily separated from water by fractional
distillation?
1. BP=97 deg C
2. BP=82 deg C
3. BP= 65 deg C
4. BP=118 deg C
5. BP=80 deg C - ANSWERS✔-3's BP is the farthest from 100 deg C
\.Which alkyl halide would react the fastest in a nucleophilic substitution using
silver nitrate? in EtOH (weak nucleophile, protic solvent)? - ANSWERS✔-3-bromo-
3-methylpentane, because it is the most highly substituted and SN1 rxn
\.In the recrystallization experiment, you determined the identity of your
unknown from: - ANSWERS✔-its melting point
\.Refluxing - ANSWERS✔-heats without loss of solvent
, \.Which alkyl halid would react fastest in a Nucleophilic substitution using NaI in
Acetone? (strong nucleophile, aprotic solvent)? - ANSWERS✔-1-bromopentane
(least substituted, SN2)
\.In the transfer hydrogenation of olive oil experiment, the source of hydrogen
was - ANSWERS✔-cyclohexene
\.Why was cyclohexene used in the transfer hydrogenation of olive oil experiment,
instead of actual H2? - ANSWERS✔-H2 is explosive
\.Which would be the most effective way to separate two miscible liquids whose
BP's are 25 degrees C apart? - ANSWERS✔-Fractional distillation
\.Be able to draw and name the important parts of a distillation apparatus -
ANSWERS✔-round bottom flask
distillation head
condenser
side arm
thermometer
short stem funnel
graduated cylinder
\.List the 4 general factors that affect the separation obtained on gas
chromatography - ANSWERS✔-column temperature
column length
WITH VERIFIED ANSWERS
\.In the distillation experiment, the purpose of a fractionating column was to -
ANSWERS✔-Give a better separation for the mixture to be distilled
\.Which liquid would be most easily separated from water by fractional
distillation?
1. BP=97 deg C
2. BP=82 deg C
3. BP= 65 deg C
4. BP=118 deg C
5. BP=80 deg C - ANSWERS✔-3's BP is the farthest from 100 deg C
\.Which alkyl halide would react the fastest in a nucleophilic substitution using
silver nitrate? in EtOH (weak nucleophile, protic solvent)? - ANSWERS✔-3-bromo-
3-methylpentane, because it is the most highly substituted and SN1 rxn
\.In the recrystallization experiment, you determined the identity of your
unknown from: - ANSWERS✔-its melting point
\.Refluxing - ANSWERS✔-heats without loss of solvent
, \.Which alkyl halid would react fastest in a Nucleophilic substitution using NaI in
Acetone? (strong nucleophile, aprotic solvent)? - ANSWERS✔-1-bromopentane
(least substituted, SN2)
\.In the transfer hydrogenation of olive oil experiment, the source of hydrogen
was - ANSWERS✔-cyclohexene
\.Why was cyclohexene used in the transfer hydrogenation of olive oil experiment,
instead of actual H2? - ANSWERS✔-H2 is explosive
\.Which would be the most effective way to separate two miscible liquids whose
BP's are 25 degrees C apart? - ANSWERS✔-Fractional distillation
\.Be able to draw and name the important parts of a distillation apparatus -
ANSWERS✔-round bottom flask
distillation head
condenser
side arm
thermometer
short stem funnel
graduated cylinder
\.List the 4 general factors that affect the separation obtained on gas
chromatography - ANSWERS✔-column temperature
column length
