OCHEM LAB FINAL EXAM REVIEW
QUESTIONS COMPLETE WITH 100%
VERIFIED ANSWERS
\.Which technique will you use to determine the purity of a solid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - ANSWERS✔-melting point
\.In the meling 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 - ANSWERS✔-mixed melting point
\.will an impurity increase or decrease the melting point temperature of a pure
sample?
a. increase
b. decrease - ANSWERS✔-decrease
,\.will an impurity increase or decrease the melting point range of a pure sample?
a. increase
b. decrease - ANSWERS✔-increase
\.Which technique will you use to determine the identity of a liquid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - ANSWERS✔-boiling point
\.What should the melting 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 - ANSWERS✔-1-2 degrees C
\.In this experiment, the thermometer bulb should be positioned in the vapor and
not in the liquid to determine the boiling point of your liquid.
a. True
b. False - ANSWERS✔-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 - ANSWERS✔-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 - ANSWERS✔-higher boiling point
\.Will strong IMFs result in a higher melting point for a solid or a lower melting
point for a solid?
a. higher melting point
b. lower melting point - ANSWERS✔-higher melting point
\.In the melting/boiling point lab, What is the Melting Range (in C) of Unknown
Sample A? - ANSWERS✔-95
\.In the melting/boiling point lab, What is the Melting Range (in C) of Unknown
Sample B? - ANSWERS✔-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 - ANSWERS✔-lower
\.In the melting/boiling point lab, What is the Melting Range (in C) of the Pure
Unknown? - ANSWERS✔-78
\.In the melting/boiling point lab, What is the Melting Range (in C) of the Pure
Unknown mixed with Benzoic Acid? - ANSWERS✔-123
\.In the melting/boiling point lab, What is the Melting Range (in C) of the pure
Unknown mixed with Salicylic Acid? - ANSWERS✔-115.5
\.In the melting/boiling point, What is the identity of your unknown compound in
your melting point experiment?
a. Benzoic acid
b. salicylic acid - ANSWERS✔-Benzoic acid
\.In the melting/boiling point lab, What is the Boiling Point Range (in C) of the
Unknown Sample? - ANSWERS✔-78
\.In the melting/boiling point, What is the identity of your unknown liquid in your
melting point experiment?
a. methanol
b. tetrahydrofuran
QUESTIONS COMPLETE WITH 100%
VERIFIED ANSWERS
\.Which technique will you use to determine the purity of a solid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - ANSWERS✔-melting point
\.In the meling 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 - ANSWERS✔-mixed melting point
\.will an impurity increase or decrease the melting point temperature of a pure
sample?
a. increase
b. decrease - ANSWERS✔-decrease
,\.will an impurity increase or decrease the melting point range of a pure sample?
a. increase
b. decrease - ANSWERS✔-increase
\.Which technique will you use to determine the identity of a liquid sample?
a. mixed melting point
b. melting point
c. boiling point
d. mixed boiling point - ANSWERS✔-boiling point
\.What should the melting 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 - ANSWERS✔-1-2 degrees C
\.In this experiment, the thermometer bulb should be positioned in the vapor and
not in the liquid to determine the boiling point of your liquid.
a. True
b. False - ANSWERS✔-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 - ANSWERS✔-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 - ANSWERS✔-higher boiling point
\.Will strong IMFs result in a higher melting point for a solid or a lower melting
point for a solid?
a. higher melting point
b. lower melting point - ANSWERS✔-higher melting point
\.In the melting/boiling point lab, What is the Melting Range (in C) of Unknown
Sample A? - ANSWERS✔-95
\.In the melting/boiling point lab, What is the Melting Range (in C) of Unknown
Sample B? - ANSWERS✔-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 - ANSWERS✔-lower
\.In the melting/boiling point lab, What is the Melting Range (in C) of the Pure
Unknown? - ANSWERS✔-78
\.In the melting/boiling point lab, What is the Melting Range (in C) of the Pure
Unknown mixed with Benzoic Acid? - ANSWERS✔-123
\.In the melting/boiling point lab, What is the Melting Range (in C) of the pure
Unknown mixed with Salicylic Acid? - ANSWERS✔-115.5
\.In the melting/boiling point, What is the identity of your unknown compound in
your melting point experiment?
a. Benzoic acid
b. salicylic acid - ANSWERS✔-Benzoic acid
\.In the melting/boiling point lab, What is the Boiling Point Range (in C) of the
Unknown Sample? - ANSWERS✔-78
\.In the melting/boiling point, What is the identity of your unknown liquid in your
melting point experiment?
a. methanol
b. tetrahydrofuran
