MCAT101 AAMC FL1 CHEMISTRY
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thin layer chromatography - 🧠ANSWER ✔✔-separation technique using
silica/cellulose gel
-nonpolar molecules travel up to top
-polar molecules stuck at bottom (hindered by hydrogen bonding)
-cellulose paper pulls water(along with it's dissolved polar molecules) and
slows migration
*Rf= (Δmigration/total), higher Rf higher nonpolarity
,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 - 🧠ANSWER ✔✔A. H-bonds; molecule migration
depends on hinderance by H-bonds (cellulose absorbs primary H2O, pulls
polar solvents along)
*pulling effect similar to Aldo<-salt<-water
Given that Compound A + Cyanohydrin->malic acid->Asp(D).
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. - 🧠ANSWER ✔✔C. Compound A and cyanide were
available on primitive Earth.
*Use PoE. A.) is irrelevant, b.) has extreme words, D) psg didn't mention
water as catalyst. Lastly requires skimming to confirm if CompoundA+cyan
was an reactant
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
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STATEMENT. ALL RIGHTS RESERVED
, D. 10 - 🧠ANSWER ✔✔A.) R= (2/10)= 0.20
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. - 🧠ANSWER ✔✔D.) The reaction is
stereospecific; This rxn is tertiary dehydration with carbocation forming
racemic mixture. Only primary/secondary alcohols are stereospecific
(inverted product) thus D.) is false.
*Use PoE. A.) and C.) same answers so it's wrong. B.) is wrong.
Dehydration always release a H2O.
What type of functional group is formed when aspartic acid reacts with
another amino acid to form a peptide bond?
(analysis) 2025 Expert Verified | Ace the
Test
thin layer chromatography - 🧠ANSWER ✔✔-separation technique using
silica/cellulose gel
-nonpolar molecules travel up to top
-polar molecules stuck at bottom (hindered by hydrogen bonding)
-cellulose paper pulls water(along with it's dissolved polar molecules) and
slows migration
*Rf= (Δmigration/total), higher Rf higher nonpolarity
,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 - 🧠ANSWER ✔✔A. H-bonds; molecule migration
depends on hinderance by H-bonds (cellulose absorbs primary H2O, pulls
polar solvents along)
*pulling effect similar to Aldo<-salt<-water
Given that Compound A + Cyanohydrin->malic acid->Asp(D).
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. - 🧠ANSWER ✔✔C. Compound A and cyanide were
available on primitive Earth.
*Use PoE. A.) is irrelevant, b.) has extreme words, D) psg didn't mention
water as catalyst. Lastly requires skimming to confirm if CompoundA+cyan
was an reactant
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
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, D. 10 - 🧠ANSWER ✔✔A.) R= (2/10)= 0.20
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. - 🧠ANSWER ✔✔D.) The reaction is
stereospecific; This rxn is tertiary dehydration with carbocation forming
racemic mixture. Only primary/secondary alcohols are stereospecific
(inverted product) thus D.) is false.
*Use PoE. A.) and C.) same answers so it's wrong. B.) is wrong.
Dehydration always release a H2O.
What type of functional group is formed when aspartic acid reacts with
another amino acid to form a peptide bond?
