OChem Lab Final 3106 Exam
Questions & Answers (Grade A+)
What gas fills the balloon in this experiment? -
correct answer ✅hydrogen
What physical property would help you determine the layers? -
correct answer ✅density
How much magnesium sulfate is needed to dry the
dichloromethane? -
correct answer ✅just enough that some of the solid remains free
flowing
Why is the organic layer washed with a saturated NaCl solution
(brine)? -
correct answer ✅it draws out water dissolved in the organic layer
If 102 mg of methyl cinnamte is reduced to give the product shown
in Scheme 4 and 87 mg of product is isolated, what is the precent
yield? Give only the number and not a % or the word percent. -
correct answer ✅84.0
, OChem Lab Final 3106 Exam
Questions & Answers (Grade A+)
During which step of a free-radical chain-growth polymerization
does the polymer actually grow or chain extend? -
correct answer ✅Propagation
What gas is produced in the reaction thus necessitating the need
for loosely capped vials to allow it to escape? (polymerization) -
correct answer ✅oxygen
What happens if two radicals react with each other to form a new
covalent bond during the reaction instead of a radical reacting with
a C=C to form a new covalent bond and a new radical? -
correct answer ✅The reaction terminates.
In the first step of hydroboration mechanism, why is an arrow
drawn from the pi bond of the alkene to the B atom of the borane
reagent signifying the pi electrons are used to make a new C-B
bond? See the background information presented with Part I. -
correct answer ✅The boron atom is a lewis acid.
Which of the following are hazards associated with 3.0 M NaOH
(aq)? Choose all that apply. -
correct answer ✅causes severe skin burns, causes severe eye
damage
Questions & Answers (Grade A+)
What gas fills the balloon in this experiment? -
correct answer ✅hydrogen
What physical property would help you determine the layers? -
correct answer ✅density
How much magnesium sulfate is needed to dry the
dichloromethane? -
correct answer ✅just enough that some of the solid remains free
flowing
Why is the organic layer washed with a saturated NaCl solution
(brine)? -
correct answer ✅it draws out water dissolved in the organic layer
If 102 mg of methyl cinnamte is reduced to give the product shown
in Scheme 4 and 87 mg of product is isolated, what is the precent
yield? Give only the number and not a % or the word percent. -
correct answer ✅84.0
, OChem Lab Final 3106 Exam
Questions & Answers (Grade A+)
During which step of a free-radical chain-growth polymerization
does the polymer actually grow or chain extend? -
correct answer ✅Propagation
What gas is produced in the reaction thus necessitating the need
for loosely capped vials to allow it to escape? (polymerization) -
correct answer ✅oxygen
What happens if two radicals react with each other to form a new
covalent bond during the reaction instead of a radical reacting with
a C=C to form a new covalent bond and a new radical? -
correct answer ✅The reaction terminates.
In the first step of hydroboration mechanism, why is an arrow
drawn from the pi bond of the alkene to the B atom of the borane
reagent signifying the pi electrons are used to make a new C-B
bond? See the background information presented with Part I. -
correct answer ✅The boron atom is a lewis acid.
Which of the following are hazards associated with 3.0 M NaOH
(aq)? Choose all that apply. -
correct answer ✅causes severe skin burns, causes severe eye
damage
