Ochem Lab Final Exam Review| Ques ons and answers
| Updated RATED A+ | NEW 2026
Which technique will you use to determine the purity of a solid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
mel ng point
In the meling and boiling point lab, which technique did you use to determine the iden ty of a
solid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
mixed mel ng point
will an impurity increase or decrease the mel ng point temperature of a pure sample?
a. increase
b. decrease
decrease
will an impurity increase or decrease the mel ng point range of a pure sample?
a. increase
b. decrease
increase
Which technique will you use to determine the iden ty of a liquid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
boiling point
,What should the mel ng point range be for a pure substance?
a. 3-5 degrees C
b. 2-4 degrees C
c. 5-10 degrees C
d. 1-2 degrees C
1-2 degrees C
In this experiment, the thermometer bulb should be posi oned in the vapor and not in the
liquid to determine the boiling point of your liquid.
a. True
b. False
True
What is the purpose of wrapping the boiling point apparatus with aluminum foil?
a. to maximize heat loss
b. to maximize cooling
c. to minimize heat loss
d. to protect from light
to minimize heat loss
Will strong IMFs result in a higher boiling point for a liquid or a lower boiling point for a liquid?
a. higher boiling point
b. lower boiling point
higher boiling point
Will strong IMFs result in a higher mel ng point for a solid or a lower mel ng point for a solid?
a. higher mel ng point
b. lower mel ng point
higher mel ng point
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of Unknown Sample A?
95
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of Unknown Sample B?
123
The impure sample should at least start to melt at a much . temperature than the pure.
Which of the following fits the blank?
,a. lower
b. higher
lower
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the Pure Unknown?
78
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the Pure Unknown mixed
with Benzoic Acid?
123
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the pure Unknown mixed
with Salicylic Acid?
115.5
In the mel ng/boiling point, What is the iden ty of your unknown compound in your mel ng
point experiment?
a. Benzoic acid
b. salicylic acid
Benzoic acid
In the mel ng/boiling point lab, What is the Boiling Point Range (in C) of the Unknown Sample?
78
In the mel ng/boiling point, What is the iden ty of your unknown liquid in your mel ng point
experiment?
a. methanol
b. tetrahydrofuran
c. ethanol
d. cyclohexene
ethanol
In the mel ng/boiling point lab, What are the two most important intermolecular forces
present in your unknown solid that needs to be broken in order to melt a solid sample of it?
a. ion-dipole forces
b. Hydrogen bonding
, c. London dispersion forces
d. covalent boding
Hydrogen bonding and London dispersion forces
In the mel ng/boiling point lab,What are the two most important intermolecular forces present
in your unknown liquid that need to be broken in order to boil a liquid sample of it?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. covalent bonding
Hydrogen bonding and London dispersion forces
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between acetone and isopropanol (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. hydrophobic interac ons
hydrogen bonding
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between acetone and isobutane (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. hydrophobic interac ons
dipole-dipole forces
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between 1-hexanol and nonanal (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. A or C
ion-dipole forces or London dispersion forces
| Updated RATED A+ | NEW 2026
Which technique will you use to determine the purity of a solid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
mel ng point
In the meling and boiling point lab, which technique did you use to determine the iden ty of a
solid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
mixed mel ng point
will an impurity increase or decrease the mel ng point temperature of a pure sample?
a. increase
b. decrease
decrease
will an impurity increase or decrease the mel ng point range of a pure sample?
a. increase
b. decrease
increase
Which technique will you use to determine the iden ty of a liquid sample?
a. mixed mel ng point
b. mel ng point
c. boiling point
d. mixed boiling point
boiling point
,What should the mel ng point range be for a pure substance?
a. 3-5 degrees C
b. 2-4 degrees C
c. 5-10 degrees C
d. 1-2 degrees C
1-2 degrees C
In this experiment, the thermometer bulb should be posi oned in the vapor and not in the
liquid to determine the boiling point of your liquid.
a. True
b. False
True
What is the purpose of wrapping the boiling point apparatus with aluminum foil?
a. to maximize heat loss
b. to maximize cooling
c. to minimize heat loss
d. to protect from light
to minimize heat loss
Will strong IMFs result in a higher boiling point for a liquid or a lower boiling point for a liquid?
a. higher boiling point
b. lower boiling point
higher boiling point
Will strong IMFs result in a higher mel ng point for a solid or a lower mel ng point for a solid?
a. higher mel ng point
b. lower mel ng point
higher mel ng point
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of Unknown Sample A?
95
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of Unknown Sample B?
123
The impure sample should at least start to melt at a much . temperature than the pure.
Which of the following fits the blank?
,a. lower
b. higher
lower
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the Pure Unknown?
78
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the Pure Unknown mixed
with Benzoic Acid?
123
In the mel ng/boiling point lab, What is the Mel ng Range (in C) of the pure Unknown mixed
with Salicylic Acid?
115.5
In the mel ng/boiling point, What is the iden ty of your unknown compound in your mel ng
point experiment?
a. Benzoic acid
b. salicylic acid
Benzoic acid
In the mel ng/boiling point lab, What is the Boiling Point Range (in C) of the Unknown Sample?
78
In the mel ng/boiling point, What is the iden ty of your unknown liquid in your mel ng point
experiment?
a. methanol
b. tetrahydrofuran
c. ethanol
d. cyclohexene
ethanol
In the mel ng/boiling point lab, What are the two most important intermolecular forces
present in your unknown solid that needs to be broken in order to melt a solid sample of it?
a. ion-dipole forces
b. Hydrogen bonding
, c. London dispersion forces
d. covalent boding
Hydrogen bonding and London dispersion forces
In the mel ng/boiling point lab,What are the two most important intermolecular forces present
in your unknown liquid that need to be broken in order to boil a liquid sample of it?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. covalent bonding
Hydrogen bonding and London dispersion forces
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between acetone and isopropanol (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. hydrophobic interac ons
hydrogen bonding
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between acetone and isobutane (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. hydrophobic interac ons
dipole-dipole forces
In the mel ng/boiling point lab, Which intermolecular force do you think is primarily
responsible for the difference in boiling point between 1-hexanol and nonanal (structures
below)?
a. ion-dipole forces
b. Hydrogen bonding
c. London dispersion forces
d. A or C
ion-dipole forces or London dispersion forces
