CHM2211L Final Exam UF
What effect do soluble impurities have on the melting point It decreases and broadens the range
range of an organic compound?
Inaccurate melting point determinations are often made True
due to poor heat transfer to the sample.
Consider the acid catalyzed hydration reaction shown 28.88
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.
Use the dropdown boxes below to complete the statement the first droplets of liquid are observed
describing how to record the melting point of a sample: !the last bit of solid sample melts
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 .
An ideal recrystallization solvent dissolves your material at high , low
[ Select ] ["high", "low", "any"] temperature and does not
dissolve it at [ Select ] ["any", "high", "low"] temperature.
Lily notices that there is some activated carbon in her She can do a quick hot gravity filtration after the crude product is dissolved.
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?
Assume that you carried out a recrystallization of Tylenol 60.72
using ethanol. If you started with 6.11 grams of crude pure/crude x100
Tylenol and isolated 3.71 grams of pure Tylenol, what is
your percent recovery? Report your answer to the nearest
0.01%.
Richard, a cat owner on a budget, wants to switch his cat's The 5% rule is the common cutoff that is used in many statistical analyses.
food from a name brand to a generic one. However, Correct! If the cat finished the four bowls of the name brand but did not touch the
knowing how picky his cat is, he wants to test whether his generic, Richard can say his cat can tell the difference, based on Fisher's rule.
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:
Two new vaccines for Covid-19 were made by a laboratory True
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.
, CHM2211L Final Exam UF
The density of a solvent will determine its position relative true
to another solvent in the separatory funnel.
Calculate the degrees of unsaturation (also known as 6
index of hydrogen deficiency, IHD) for testosterone, which
has the molecular formula C19H28O2.
True or False: You can separate the following two False
compounds using a 10% NaOH solution.
Which of the following would be a reasonable mechanism UV light provides energy for π electrons to be promoted to π*, and the resulting
by which photolysis of bilirubin allows it to convert into the species can rotate to form the other isomer.
more soluble isomer?
If the Rf value of chlorophyll a is smaller than b-carotene, Chlorophyll a is more polar than b-carotene
this means:
You conducted a TLC experiment and found that your 0.65
compound traveled 5.97 cm and the eluting solvent distance (spot)/distance (solvent)
traveled 9.19 cm. What is the Rf value for your compound?
Report your answer to two decimal places (i.e., 0.01).
When Taxol is used as a treatment for breast cancer, the 500^-3x3886x4
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.
The role of benzene in an EAS reaction is to act as an False
electrophile, while a halogen like iodine serves as a
nucleophile.
In an EAS iodination reaction, 0.84 grams of phenol (MW: 27%
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%).
Melting Point temperature at which the solid phase is in equilibrium with the liquid phase
Pure Compound sharp melting point, range is narrow (1-2 degrees)
Why does the presence of a soluble impurity in a sample because the impurity disrupts the crystalline lattice of the sample so less energy is
has the effect of lowering and broadening the melting point required to convert the solid phase into a liquid phase
range?
What effects does insoluble impurity like sand and glass no effect
has on MP?
Errors of taking melting points: 1. improper amount of sample in capillary tube 2) mistaking sagging or shrinking
sample as melting 3) presence of solvent cause crystals to "sweat"
What effect do soluble impurities have on the melting point It decreases and broadens the range
range of an organic compound?
Inaccurate melting point determinations are often made True
due to poor heat transfer to the sample.
Consider the acid catalyzed hydration reaction shown 28.88
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.
Use the dropdown boxes below to complete the statement the first droplets of liquid are observed
describing how to record the melting point of a sample: !the last bit of solid sample melts
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 .
An ideal recrystallization solvent dissolves your material at high , low
[ Select ] ["high", "low", "any"] temperature and does not
dissolve it at [ Select ] ["any", "high", "low"] temperature.
Lily notices that there is some activated carbon in her She can do a quick hot gravity filtration after the crude product is dissolved.
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?
Assume that you carried out a recrystallization of Tylenol 60.72
using ethanol. If you started with 6.11 grams of crude pure/crude x100
Tylenol and isolated 3.71 grams of pure Tylenol, what is
your percent recovery? Report your answer to the nearest
0.01%.
Richard, a cat owner on a budget, wants to switch his cat's The 5% rule is the common cutoff that is used in many statistical analyses.
food from a name brand to a generic one. However, Correct! If the cat finished the four bowls of the name brand but did not touch the
knowing how picky his cat is, he wants to test whether his generic, Richard can say his cat can tell the difference, based on Fisher's rule.
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:
Two new vaccines for Covid-19 were made by a laboratory True
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.
, CHM2211L Final Exam UF
The density of a solvent will determine its position relative true
to another solvent in the separatory funnel.
Calculate the degrees of unsaturation (also known as 6
index of hydrogen deficiency, IHD) for testosterone, which
has the molecular formula C19H28O2.
True or False: You can separate the following two False
compounds using a 10% NaOH solution.
Which of the following would be a reasonable mechanism UV light provides energy for π electrons to be promoted to π*, and the resulting
by which photolysis of bilirubin allows it to convert into the species can rotate to form the other isomer.
more soluble isomer?
If the Rf value of chlorophyll a is smaller than b-carotene, Chlorophyll a is more polar than b-carotene
this means:
You conducted a TLC experiment and found that your 0.65
compound traveled 5.97 cm and the eluting solvent distance (spot)/distance (solvent)
traveled 9.19 cm. What is the Rf value for your compound?
Report your answer to two decimal places (i.e., 0.01).
When Taxol is used as a treatment for breast cancer, the 500^-3x3886x4
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.
The role of benzene in an EAS reaction is to act as an False
electrophile, while a halogen like iodine serves as a
nucleophile.
In an EAS iodination reaction, 0.84 grams of phenol (MW: 27%
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%).
Melting Point temperature at which the solid phase is in equilibrium with the liquid phase
Pure Compound sharp melting point, range is narrow (1-2 degrees)
Why does the presence of a soluble impurity in a sample because the impurity disrupts the crystalline lattice of the sample so less energy is
has the effect of lowering and broadening the melting point required to convert the solid phase into a liquid phase
range?
What effects does insoluble impurity like sand and glass no effect
has on MP?
Errors of taking melting points: 1. improper amount of sample in capillary tube 2) mistaking sagging or shrinking
sample as melting 3) presence of solvent cause crystals to "sweat"
