Ochem Lab Final Exam- Organic Chemistry LAB EXAM
LATEST 2026-2027 250 QUESTIONS AND 100% Verified
ANSWERS
In the melTing and boiling point lab, which technique did you use to determine the identity of a solid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - answer>>mixed melting point
In the Acetaminophen lab, the reactant is
a. water
b. acetic anhydride
c. p-aminophenol - answer>>p-aminophenol
In the Acetaminophen lab, What TWO steps will be used first to isolate the product of the reaction?
a. dehydration and filtration
b. crystallization and filtration
c. crystallization and distillation
d. distillation and filtration - answer>>crystallization and filtration
In the Acetaminophen lab,
a. distillation
b. filtration
c. crystallization
d. recrystallization - answer>>recrystallization
What is the purpose of refluxing your reaction?
,a. To heat the reaction
b. Add thermal energy
c. Help to break bonds
d. A,B, and C - answer>>A,B, and C
Will you determine the limiting reagent by comparing weights or moles?
a. weights
b. moles - answer>>moles
In the Acetaminophen lab, Select TWO methods that you will use in this lab to characterize your product.
a. IR spectroscopy
b. TLC
c. boiling point
d. melting point - answer>>Ir spectroscopy and melting point
Suppose, the mass of the starting p-aminophenol is 152 mg. Calculate the number of moles of the starting p-
aminophenol.
Molar mass of p-aminophenol = 109.1 g/mol - answer>>1.39 x*10^-3 moles
Suppose, the volume of acetic anhydride used is 0.3 mL. How many moles of acetic anhydride is this?
Density of acetic anhydride = 1.08 g/mL
Molar mass of acetic anhydride = 102.1 g/mol - answer>>3.17 * 10^-3 moles
In the Acetaminophen lab, Based on the number of moles of p-aminophenol and acetic anhydride, which is the
limiting reactant or reagent?
a. p-aminophenol
b. Acetic anhydride - answer>>p-aminophenol
,Suppose, the mass of crude acetaminophen obtained is 128 mg. Calculate the number of moles of crude product
obtained.
Molar mass of acetaminophen = 151.2 g/mol - answer>>8.46 * 10^-4 moles
Suppose, the mass of the pure acetaminophen is 90 mg. Calculate the number of moles of the pure product
obtained.
Molar mass of acetaminophen = 151.2 g/mol - answer>>5.95 * 10^-4 moles
We can't calculate the _____ of a reaction by taking the ratio of the _______ of the product to the mass of the
limiting reagent/reactant. In other words, we have to convert the masses into ____ . This is because different
chemicals have different molecular ____. - answer>>
The IR spectrum of the pure acetaminophen product is shown above. Identify the peak at 3321 cm^-1. -
answer>>N-H (amide)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 3125 cm^-1. -
answer>>O-H (alcohol)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 1649 cm^-1. -
answer>>C=O (amide)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 1608 cm^-1. -
answer>>Benzene ring
In the Acetaminophen lab, p-acetylaminophenol is the
a. desired product
b. side product
c. by product - answer>>desired product
In the Acetaminophen lab, p-aminophenyl acetate is the
a. desired product
, b. side product
c. by product - answer>>side product
In the Acetaminophen lab, acetic acid is the
a. desired product
b. side product
c. by product - answer>>by product
True or False?
Formation of side products reduce the chemical yield of a reaction but formation of by-products don't. -
answer>>True
In the Acetaminophen lab, Water is the solvent for your reaction. What is the temperature (in C) of the reaction
under reflux?
a. 50
b. 100
c. 150
d. 200 - answer>>
What is the name of the procedure where a reaction mixture is heated, the liquid/solvent boils, its vapors are
condensed and drips back into the reaction vessel so that no liquid is lost?
a. distillation
b. condensation
c. filtration
d. reflux - answer>>reflux
Select the correct answer for why most reactions have an activation energy and have to be heated.
a. Because new bonds have to be made before old bonds can be broken.
LATEST 2026-2027 250 QUESTIONS AND 100% Verified
ANSWERS
In the melTing and boiling point lab, which technique did you use to determine the identity of a solid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - answer>>mixed melting point
In the Acetaminophen lab, the reactant is
a. water
b. acetic anhydride
c. p-aminophenol - answer>>p-aminophenol
In the Acetaminophen lab, What TWO steps will be used first to isolate the product of the reaction?
a. dehydration and filtration
b. crystallization and filtration
c. crystallization and distillation
d. distillation and filtration - answer>>crystallization and filtration
In the Acetaminophen lab,
a. distillation
b. filtration
c. crystallization
d. recrystallization - answer>>recrystallization
What is the purpose of refluxing your reaction?
,a. To heat the reaction
b. Add thermal energy
c. Help to break bonds
d. A,B, and C - answer>>A,B, and C
Will you determine the limiting reagent by comparing weights or moles?
a. weights
b. moles - answer>>moles
In the Acetaminophen lab, Select TWO methods that you will use in this lab to characterize your product.
a. IR spectroscopy
b. TLC
c. boiling point
d. melting point - answer>>Ir spectroscopy and melting point
Suppose, the mass of the starting p-aminophenol is 152 mg. Calculate the number of moles of the starting p-
aminophenol.
Molar mass of p-aminophenol = 109.1 g/mol - answer>>1.39 x*10^-3 moles
Suppose, the volume of acetic anhydride used is 0.3 mL. How many moles of acetic anhydride is this?
Density of acetic anhydride = 1.08 g/mL
Molar mass of acetic anhydride = 102.1 g/mol - answer>>3.17 * 10^-3 moles
In the Acetaminophen lab, Based on the number of moles of p-aminophenol and acetic anhydride, which is the
limiting reactant or reagent?
a. p-aminophenol
b. Acetic anhydride - answer>>p-aminophenol
,Suppose, the mass of crude acetaminophen obtained is 128 mg. Calculate the number of moles of crude product
obtained.
Molar mass of acetaminophen = 151.2 g/mol - answer>>8.46 * 10^-4 moles
Suppose, the mass of the pure acetaminophen is 90 mg. Calculate the number of moles of the pure product
obtained.
Molar mass of acetaminophen = 151.2 g/mol - answer>>5.95 * 10^-4 moles
We can't calculate the _____ of a reaction by taking the ratio of the _______ of the product to the mass of the
limiting reagent/reactant. In other words, we have to convert the masses into ____ . This is because different
chemicals have different molecular ____. - answer>>
The IR spectrum of the pure acetaminophen product is shown above. Identify the peak at 3321 cm^-1. -
answer>>N-H (amide)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 3125 cm^-1. -
answer>>O-H (alcohol)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 1649 cm^-1. -
answer>>C=O (amide)
The IR spectrum of the pure acetaminophen is shown above in question 10. Identify the peak at 1608 cm^-1. -
answer>>Benzene ring
In the Acetaminophen lab, p-acetylaminophenol is the
a. desired product
b. side product
c. by product - answer>>desired product
In the Acetaminophen lab, p-aminophenyl acetate is the
a. desired product
, b. side product
c. by product - answer>>side product
In the Acetaminophen lab, acetic acid is the
a. desired product
b. side product
c. by product - answer>>by product
True or False?
Formation of side products reduce the chemical yield of a reaction but formation of by-products don't. -
answer>>True
In the Acetaminophen lab, Water is the solvent for your reaction. What is the temperature (in C) of the reaction
under reflux?
a. 50
b. 100
c. 150
d. 200 - answer>>
What is the name of the procedure where a reaction mixture is heated, the liquid/solvent boils, its vapors are
condensed and drips back into the reaction vessel so that no liquid is lost?
a. distillation
b. condensation
c. filtration
d. reflux - answer>>reflux
Select the correct answer for why most reactions have an activation energy and have to be heated.
a. Because new bonds have to be made before old bonds can be broken.
