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AAMC Test 3 exam with 100% correct answers 2025

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For a thermodynamic mixture of isomeric products correct answersthe relative mole ratio of products is directly related to the relative stability of these products #2. What can be inferred from the results of scheme A about the relative thermodynamic stabilities of Compounds 4a and 4b A. Comp...

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  • January 22, 2025
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  • 2024/2025
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AAMC Test 3

For a thermodynamic mixture of isomeric products correct answersthe
relative
ratio mole
of products is directly related to the relative stability of
these products
#2. What can be inferred from the results of scheme A about
the relative
thermodynamic stabilities of Compounds 4a
and 4b
A. Compound 4a is less stable than
Compound
B. They are4b. equally
stable.
C. Nothing can be inferred about relative thermodynamic
stabilities.
D. Compound 4a is more stable than Compound 4b. correct
answersCompound
more stable than 4a is
4b
The image shows that 4a is produced 60% and
4b 40%.
--So 4a will be more stable among the two thermodynamic
products
#3. Which of the following compounds is most likely to be a major product
in step
the aldol2 if
condensation is NOT followed by a dehydration reaction? correct
answersAns
in
image
--coz if there is no dehydration, then the OH would be present instead of
the double
bon
d
#4. Compound X is shown below.
(image)
If compound 2 is replaced with compound X, what will be the structure
of the final
product in steps 1 and 2? (Note: assume that the yields of steps 1 and
2 are notby substitution) correct answersAns in
affected
image
--coz this is the product of Michael addition followed by
intramolecular(Robinson
condensation aldol
annulation)
#5. What is the total amount of charge and energy, respectively, that the
capacitor
store will
if it is connected to the battery on the railcar? correct
answers1.20C and 7.20J
C=Q/
V
Energy stored by a capacitor = Ue = (1//2)CV^2 = (1/2)QV =
(1/2)Q^2V
Give
n
V=
12V
C = 100 x 10^-
3F

,Q = VC = (12)(100 x 10^-3) =
1.20 C
Ue = (1/2)QV = (1/2)(1.20)(12) =
7.20J
#6. Suppose that the railcar passes by a horn that is emitting a sound with
a frequency
f. Which of the following describes f' that the person on the railcar
hears? correct
answersf' > f before passing the horn, f' < f after
passing it
Due to doppler effect, the frequency that the person on the railcar hears
before
the hornpassing
is larger than the actual frequency of the sound emitted, while the
person
a hearslower than the actual frequency after passing
frequency
the horn
--Before passing the horn, the object(rail car) is coming closer to the
source (horn) so
f'
>f
--After passing the horn, the object(railcar) is moving away from the source
(horn) so f<f'
Doppler effect correct answersThe apparent frequency (f') of the source is
increased
the sourceas approaches the observer, and is decreased as the sources
leaves the
observe
r
f' = ((V+_ Vo)/(V-
+Vs))f
#7. A railcar has a decelerating force of 1000 N. if no braking occurs, a
total ofpower
much how would be required to keep the railcar moving
at 40 m/s?
A. 16
kW
B. 40
kW
C. 600
kW
D. 800 kW correct answersPower = work
done/done
Work time =
v= d/t --> d
Fd
=vt
W= Fd -->
Fvt
P = Fv = (1000N)(40) = 40000 W =
40 kW
There are lot of force values given in the passage but we use 1000N coz
the powermust match the work done by the friction force that tends to
required
slow down the
railca
r
#10. Raadioactive tritium (3H) labeleed guanine has been used to measure
the rate of processes that involve its building or
biochemical
incorporation
Given that water is the solvent for this type of experiment, what is the best
site for tritum
labeling? correct
answersI

, Because the best site for tritium labeling would not exchange the tritium
ions for protons
in water. All of the N-H sites (II-IV) would readily exchange tritium protons
due to their
lone pair-facilitating protonation and subsequent tritium exchange with
water, but the C-
#8. If a generator-brake system alone were engaged when the railcar
H site (I), lacking a lone pair, would retain its
was
which moving,
tritium of the following graphs would most accurately represent the
label
subsequent
the speed of
railcar? correct answersAns
Image-->
Coz the speed of the car decreases in time such that the decelerating
force declines
linearly with speed, according to the passage. Because the decelerating
force is directly
proportional to the deceleration acceleration, it follows that the decelerating
acceleration
itself declines linearly with speed. Finally, because the decelerating
acceleration
rate of change is the
of velocity, or the slope of the velocity vs. time graph, then
slope of
the graph must decrease in
time
#9. The relative thermodynamic stability of isomeric organic compounds can
be inferred
from which of the following types of
experimental data?
A. Boiling
points
B. UV-visible absorption
spectra
C. Mass spectroscopic fragmentation
patterns
D. Heats of combustion correct answersD. Heats of
combustion
The relative thermodynamic stability of isomers can be determined
based onofthe
amount heat produced when the compounds are combusted; less
heat, greater
stabilit
y
#14. The energy of activation for the reaction described in the passage is
given byof:the
energy correct answersThe activated complex minus the energy of
the reactants
The activation energy for the reaction presents the minimum energy
barrier
to necessaryby the reactants on the path to
be overcome
products
#16. What type of reaction is occurring between I2 and Zn? correct
answersOxidation-
reductio
n
because both Zn and I2 change oxidation states during the
reaction
#18. What is the period of the voltage source that operates the plasma
pencil? correct
answers1000
ns
Because the period of a time-varying signal is the shortest repitition time.
According
fig 2, eachto pulse is on for 500ns, then off for 500ns. Thus the time between
consecutive
pulse is 500ns + 500ns =
1000ns

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