MCAT AAMC FL 1 Chem and Physics || Questions and 100% Accurate Answers.
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MCAT AAMC FL 1 Chem and Physics
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MCAT AAMC FL 1 Chem And Physics
In the chromatography of the reaction mixture, water absorbed on cellulose functioned as the stationary phase. What was the principal factor determining the migration of individual components in the sample?
A.Hydrogen bonding
B.Solute concentration
C.Stationary phase concentration
D.Thickness...
MCAT AAMC FL 1 Chem and Physics || Questions and
100% Accurate Answers.
In the chromatography of the reaction mixture, water absorbed on cellulose functioned as the
stationary phase. What was the principal factor determining the migration of individual
components in the sample?
A.Hydrogen bonding
B.Solute concentration
C.Stationary phase concentration
D.Thickness of paper - The correct answer is A.
This is an Organic Chemistry question that falls under the content category "Separation and
purification methods." The answer to this question is A because the relative amount of hydrogen
bonding to the stationary phase will determine the relative rate of migration of the various
components in the sample. It is a Scientific Reasoning and Problem Solving question because
you are asked to evaluate an argument about causes and consequences (the primary reason for
chemical separation during a chromatographic separation on cellulose).
What assumption is being made if scientists conclude that aspartic acid was formed by the
prebiological synthesis in the passage?
A.Aspartic acid is unstable at temperatures below 150°C.
B.All of the malic acid underwent the dehydration reaction to form fumaric/maleic acid.
C.Compound A and cyanide were available on primitive Earth.
D.The reaction between ammonia and fumaric acid was catalyzed by the presence of water. -
The correct answer is C.
This is an Organic Chemistry question that falls under the content category "Structure, function,
and reactivity of biologically-relevant molecules." The answer to this question is C since, in
order for the experimental reaction sequence to be relevant to the primordial formation of
aspartic acid, the starting materials used (Compound A and cyanide) are assumed to have been
available. It is a Reasoning About the Design and Execution of Research question because you
are asked to reason about the appropriateness of particular research designs to evaluate a natural
sciences question
According to the developed chromatography plate shown below, what is the approximate Rf
value of aspartic acid?
A.0.20
B.0.50
C.5
D.10 - This is an Organic Chemistry question that falls under the content category "Separation
and purification methods." The answer to this question is A (0.20) because Rf is the ratio of the
,distance travelled by the analyte relative to the solvent front during a chromatographic
separation. Aspartic acid travelled two units, while the solvent front travelled ten units, giving an
Rf of 2/10 = 0.20 for aspartic acid. It is a Data-based and Statistical Reasoning question because
you are asked to analyze and interpret data presented in a figure to draw a conclusion.
Which of the following statements does NOT correctly describe the dehydration of malic acid to
fumaric acid and maleic acid?
A.The reaction occurs most readily with tertiary alcohols.
B.The reaction involves the loss of a water molecule.
C.The reaction has a carbocation intermediate.
D.The reaction is stereospecific. - The correct answer is D.
This is an Organic Chemistry question that falls under the content category "Nature of molecules
and intermolecular interactions." The answer to this question is D because the fact that both
fumaric and maleic acid are produced means that the dehydration of malic acid is NOT
stereospecific. It is a Data-based and Statistical Reasoning question because you are asked to
analyze and interpret data (the outcome of a particular organic chemical reaction) in order to
draw a conclusion.
What type of functional group is formed when aspartic acid reacts with another amino acid to
form a peptide bond?
A.An amine group
B.An aldehyde group
C.An amide group
D.A carboxyl group - The correct answer is C.
This is an Organic Chemistry question that falls under the content category "Structure, function,
and reactivity of biologically-relevant molecules." The answer to this question is C because the
functional group that forms during peptide bond formation is known as an amide group. It is a
Knowledge of Scientific Concepts and Principles question since you are asked to recognize the
structural relationship between free amino acids and peptides.
If 2-pentanol replaces 1-pentanol in the reaction shown in Figure 3, the rate of substitution is less
because:
A.the C-O bond in 2-pentanol is stronger than the C-O bond in 1-pentanol.
B.there is a competing elimination reaction that slows the rate of substitution.
C.there is more steric hindrance at the oxygen atom in 2-pentanol than in 1-pentanol, making
protonation less likely.
D.there is more steric hindrance at the 2-position of 2-pentanol than at the 1-position of 1-
pentanol. - The correct answer is D.
This is an Organic Chemistry question that falls under the content category "Structure, function,
and reactivity of biologically-relevant molecules." The answer to this question is D because the
, rate of substitution of protonated alcohols is subject to steric hindrance. This inhibits the ability
of nucleophiles to collide with the reacting electrophilic center and slows the rate of reaction. It
is a Scientific Reasoning and Problem Solving question because you are asked to evaluate an
argument about causes and consequences (the reason a reaction proceeds more slowly when a
different reactant is used).
If Experiment 2 is repeated with HCl and the compound shown below, which of the following
compounds is NOT a direct product (without rearrangement)? - Solution: The correct answer is
A.
This is an Organic Chemistry question that falls under the content category "Structure, function,
and reactivity of biologically-relevant molecules." The answer to this question is A because the
structure shown in this response requires an additional shift of hydride atoms prior to elimination
and is therefore NOT a direct product. It is a Scientific Reasoning and Problem Solving question
because you are asked to bring together theory and observations to draw a conclusion.
If a solution containing the compounds shown in Figure 4, is injected into a gas-liquid
chromatograph, the first peak observed in the gc trace is attributable to which compound? -
Solution: The correct answer is B.
This is an Organic Chemistry question that falls under the content category "Separation and
purification methods." The answer to this question is B because 2-methyl-2-butene will exhibit
the lowest molecular weight and also the weakest intermolecular forces of attraction. This
substance will therefore migrate the fastest and be the first peak in the gas chromatograph (gc)
trace. It is a Scientific Reasoning and Problem Solving question because you are asked to bring
together theory and observations to draw a conclusion.
What is the product of the reaction of Compound 1 (shown below) with HBr by the pathway
shown in Figure 3? - The correct answer is C.
This is an Organic Chemistry question that falls under the content category "Nature of molecules
and intermolecular interactions." The answer to this question is C because the incoming
nucleophile displaces the leaving group form the opposite side of the reacting center during an
SN2 reaction. It is a Scientific Reasoning and Problem Solving question because you are asked
to bring together theory and observations to draw a conclusion.
Acetic acid and ethanol react to form an ester product as shown below. In determining which
reactant loses the -OH group, which of the following isotopic substitutions would be most
useful? - The correct answer is D.
This is an Organic Chemistry question that falls under the content category "Structure, function,
and reactivity of biologically-relevant molecules." The answer to this question is D because this
experiment involves labeling a group which does not exchange with other groups present prior to
reaction and will therefore give information about the true identity of the groups, which are
exchanged during the reaction. It is a Reasoning about the Design and Execution of Research
question because you are asked to reason about the appropriateness of particular research designs
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