CHM2211L Final Exam UF questions
well answered
What effect do soluble impurities have on the melting point range of an organic compound? -
ANS ✔✔It decreases and broadens the range
Inaccurate melting point determinations are often made due to poor heat transfer to the
sample. - ANS ✔✔True
Consider the acid catalyzed hydration reaction shown below.
If you started this reaction with 29.24 mL of cyclohexene (MW 82.14 g/mol, density 0.81 g/mL),
what is the theoretical yield of cyclohexanol in grams (MW 100.16 g/mol, density 0.96 g/mL)?
Report your answer to two decimal places. - ANS ✔✔28.88
Use the dropdown boxes below to complete the statement describing how to record the
melting point of a sample:
When measuring the melting point of a sample, always report the melting point as a range,
where the lower number of the range is the temperature where the first droplets of liquid are
observed and the upper number is the temperature where the last bit of solid sample melts . -
ANS ✔✔the first droplets of liquid are observed
!the last bit of solid sample melts
An ideal recrystallization solvent dissolves your material at [ Select ] ["high", "low", "any"]
temperature and does not dissolve it at [ Select ] ["any", "high", "low"] temperature. - ANS
✔✔high , low
Lily notices that there is some activated carbon in her acetophenetidin crude product just as she
is starting her recrystallization. What is the best way to remove the activated carbon so that Lily
,can obtain the highest quality acetophenetidin crystals? - ANS ✔✔She can do a quick hot
gravity filtration after the crude product is dissolved.
Assume that you carried out a recrystallization of Tylenol using ethanol. If you started with 6.11
grams of crude Tylenol and isolated 3.71 grams of pure Tylenol, what is your percent recovery?
Report your answer to the nearest 0.01%. - ANS ✔✔60.72
pure/crude x100
Richard, a cat owner on a budget, wants to switch his cat's food from a name brand to a generic
one. However, knowing how picky his cat is, he wants to test whether his cat can tell the
difference between them before he buys the generic in wholesale. He sets up four bowls with
the name brand, and another four with generic cat food in a random arrangement for the cat to
eat. Assume that the consumption only depends on the cat's preference, and if the cat finishes
the bowl, he likes the food. Select all that apply: - ANS ✔✔The 5% rule is the common cutoff
that is used in many statistical analyses.
Correct! If the cat finished the four bowls of the name brand but did not touch the generic,
Richard can say his cat can tell the difference, based on Fisher's rule.
Two new vaccines for Covid-19 were made by a laboratory at Harvard, namely AnCOV-A and
AnCOV-B. An experiment for testing the effectiveness of those two vaccines for COVID-19 was
conducted. AnCOV-A was applied to a group of 10 people, while AnCOV-B was applied to a
group of 30 people. The people were monitored regularly for 6 months and the results were
sent back to CDC. Probability of success in case of AnCOV-A was 98% while that of AnCOV-B was
97%.
Assuming that the head of CDC needs to decide which vaccine will be given the permission to
be released to the market. Is the following statement true or false?
Selecting AnCOV-B has better overall reliability due to a larger sample size compared to AnCOV-
A. - ANS ✔✔True
The density of a solvent will determine its position relative to another solvent in the separatory
funnel. - ANS ✔✔true
, Calculate the degrees of unsaturation (also known as index of hydrogen deficiency, IHD) for
testosterone, which has the molecular formula C19H28O2. - ANS ✔✔6
True or False: You can separate the following two compounds using a 10% NaOH solution. - ANS
✔✔False
Which of the following would be a reasonable mechanism by which photolysis of bilirubin
allows it to convert into the more soluble isomer? - ANS ✔✔UV light provides energy for π
electrons to be promoted to π*, and the resulting species can rotate to form the other isomer.
If the Rf value of chlorophyll a is smaller than b-carotene, this means: - ANS ✔✔Chlorophyll a is
more polar than b-carotene
You conducted a TLC experiment and found that your compound traveled 5.97 cm and the
eluting solvent traveled 9.19 cm. What is the Rf value for your compound? Report your answer
to two decimal places (i.e., 0.01). - ANS ✔✔0.65
distance (spot)/distance (solvent)
When Taxol is used as a treatment for breast cancer, the medication is delivered in 500
milligrams doses. Each patient typically requires four doses of Taxol over the course of their
treatment. How many grams of Taxol would be required to treat 3,886 patients? Report your
answer to the nearest gram. - ANS ✔✔500^-3x3886x4
The role of benzene in an EAS reaction is to act as an electrophile, while a halogen like iodine
serves as a nucleophile. - ANS ✔✔False
In an EAS iodination reaction, 0.84 grams of phenol (MW: 94.11 g/mol) was reacted with 2.53
grams of sodium iodide (MW: 149.89 g/mol) . If 0.53 grams of product (MW: 220.01 g/mol) was
collected, what was the percent yield (%) of the reaction? Report your answer to one decimal
place (i.e., 23.1%). - ANS ✔✔27%
well answered
What effect do soluble impurities have on the melting point range of an organic compound? -
ANS ✔✔It decreases and broadens the range
Inaccurate melting point determinations are often made due to poor heat transfer to the
sample. - ANS ✔✔True
Consider the acid catalyzed hydration reaction shown below.
If you started this reaction with 29.24 mL of cyclohexene (MW 82.14 g/mol, density 0.81 g/mL),
what is the theoretical yield of cyclohexanol in grams (MW 100.16 g/mol, density 0.96 g/mL)?
Report your answer to two decimal places. - ANS ✔✔28.88
Use the dropdown boxes below to complete the statement describing how to record the
melting point of a sample:
When measuring the melting point of a sample, always report the melting point as a range,
where the lower number of the range is the temperature where the first droplets of liquid are
observed and the upper number is the temperature where the last bit of solid sample melts . -
ANS ✔✔the first droplets of liquid are observed
!the last bit of solid sample melts
An ideal recrystallization solvent dissolves your material at [ Select ] ["high", "low", "any"]
temperature and does not dissolve it at [ Select ] ["any", "high", "low"] temperature. - ANS
✔✔high , low
Lily notices that there is some activated carbon in her acetophenetidin crude product just as she
is starting her recrystallization. What is the best way to remove the activated carbon so that Lily
,can obtain the highest quality acetophenetidin crystals? - ANS ✔✔She can do a quick hot
gravity filtration after the crude product is dissolved.
Assume that you carried out a recrystallization of Tylenol using ethanol. If you started with 6.11
grams of crude Tylenol and isolated 3.71 grams of pure Tylenol, what is your percent recovery?
Report your answer to the nearest 0.01%. - ANS ✔✔60.72
pure/crude x100
Richard, a cat owner on a budget, wants to switch his cat's food from a name brand to a generic
one. However, knowing how picky his cat is, he wants to test whether his cat can tell the
difference between them before he buys the generic in wholesale. He sets up four bowls with
the name brand, and another four with generic cat food in a random arrangement for the cat to
eat. Assume that the consumption only depends on the cat's preference, and if the cat finishes
the bowl, he likes the food. Select all that apply: - ANS ✔✔The 5% rule is the common cutoff
that is used in many statistical analyses.
Correct! If the cat finished the four bowls of the name brand but did not touch the generic,
Richard can say his cat can tell the difference, based on Fisher's rule.
Two new vaccines for Covid-19 were made by a laboratory at Harvard, namely AnCOV-A and
AnCOV-B. An experiment for testing the effectiveness of those two vaccines for COVID-19 was
conducted. AnCOV-A was applied to a group of 10 people, while AnCOV-B was applied to a
group of 30 people. The people were monitored regularly for 6 months and the results were
sent back to CDC. Probability of success in case of AnCOV-A was 98% while that of AnCOV-B was
97%.
Assuming that the head of CDC needs to decide which vaccine will be given the permission to
be released to the market. Is the following statement true or false?
Selecting AnCOV-B has better overall reliability due to a larger sample size compared to AnCOV-
A. - ANS ✔✔True
The density of a solvent will determine its position relative to another solvent in the separatory
funnel. - ANS ✔✔true
, Calculate the degrees of unsaturation (also known as index of hydrogen deficiency, IHD) for
testosterone, which has the molecular formula C19H28O2. - ANS ✔✔6
True or False: You can separate the following two compounds using a 10% NaOH solution. - ANS
✔✔False
Which of the following would be a reasonable mechanism by which photolysis of bilirubin
allows it to convert into the more soluble isomer? - ANS ✔✔UV light provides energy for π
electrons to be promoted to π*, and the resulting species can rotate to form the other isomer.
If the Rf value of chlorophyll a is smaller than b-carotene, this means: - ANS ✔✔Chlorophyll a is
more polar than b-carotene
You conducted a TLC experiment and found that your compound traveled 5.97 cm and the
eluting solvent traveled 9.19 cm. What is the Rf value for your compound? Report your answer
to two decimal places (i.e., 0.01). - ANS ✔✔0.65
distance (spot)/distance (solvent)
When Taxol is used as a treatment for breast cancer, the medication is delivered in 500
milligrams doses. Each patient typically requires four doses of Taxol over the course of their
treatment. How many grams of Taxol would be required to treat 3,886 patients? Report your
answer to the nearest gram. - ANS ✔✔500^-3x3886x4
The role of benzene in an EAS reaction is to act as an electrophile, while a halogen like iodine
serves as a nucleophile. - ANS ✔✔False
In an EAS iodination reaction, 0.84 grams of phenol (MW: 94.11 g/mol) was reacted with 2.53
grams of sodium iodide (MW: 149.89 g/mol) . If 0.53 grams of product (MW: 220.01 g/mol) was
collected, what was the percent yield (%) of the reaction? Report your answer to one decimal
place (i.e., 23.1%). - ANS ✔✔27%
