MCAT101 AAMC 150
(Chem/phy/bioc/bio/psych/social) 2025
Expert Verified | Ace the Test
Consider the reaction rate described by the following equation.
Rate = k[A]m[B]n
The overall reaction is said to be second order when:
A k is constant, m=0, and n=0.
B k is constant, m=1, and n=1.
C k is constant, m=2, and n=2.
D k=2, and m and n are variable. - 🧠ANSWER ✔✔B k is constant, m=1,
and n=1, m+n=2nd order
,A student plans to add HCl to a solution containing Pb(NO3)2(aq). To
determine how MUCH Pb2+ will precipitate from solution when the HCl is
added, the student needs to know which of the following?
A Ka for HCl
B Ka for HNO3
C Ksp for PbCl2
D Keq for the reaction Pb2+ + 2 e- <=>Pb - 🧠ANSWER ✔✔C Ksp for
PbCl2; will tell how much ions or concentration will dissolve
if Q>Ksp, will shift backwards (precipitate)
if Q<Ksp, will shift forward until Ksp is reached (dissolution)
*Ksp=shows dissolved/precipitate concentration (for ions)
pKa=shows dissociation direction (for acids)
Keq=shows concentration at equilibrium (for general prod/react)
Which of the following electron configurations of nitrogen is the most
stable?
,A 1s^2, 2s^1, 2p^4
B 1s^2, 2s^2, 2p^3
C 1s^1, 2s^2, 2p^4
D 1s^2, 2s^2, 2p^2, 3s^1 - 🧠ANSWER ✔✔B 1s^2, 2s^2, 2p^3;
stable Nitrogen has 7electrons (fills S->P)
*e- peels off from the S->P->D->F orbitals
When a weak acid (HA) is titrated with sodium hydroxide in the presence of
an indicator (HIn), the pH at which a color change is observed depends on
the:
A final concentration of HA.
B final concentration of HIn.
C initial concentration of HA.
D pKa of HIn. - 🧠ANSWER ✔✔D pKa of HIn;
the indicator changes color only when you bypass it's threshold (pka) and
release/obtain H+
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, *indicator are usually weak acids with a (+/-) 1 buffer range
Approximately how many moles of Al3+ are reduced when 0.1 faraday of
charge passes through a cell during the production of Al? (Note: Assume
there is excess Al3+ available and that Al3+ is reduced to Al metal only.)
A 0.033 mol
B 0.050 mol
C 0.067 mol
D 0.10 mol - 🧠ANSWER ✔✔A 0.033 mol
Al+3 needs (3mol e) per reduction,
0.1faraday gives 0.1 e mol (1:1 ratio)
0.1given/3 mol need=0.033
*use the fence (0.1fara/1)(1e/1fara)(1Al+3/3e)= 0.033mol e
The following reaction occurs spontaneously. Cd(s) + 2 H+(aq) →
Cd2+(aq) + H2(g) Which of the following has the highest electron affinity?
(Chem/phy/bioc/bio/psych/social) 2025
Expert Verified | Ace the Test
Consider the reaction rate described by the following equation.
Rate = k[A]m[B]n
The overall reaction is said to be second order when:
A k is constant, m=0, and n=0.
B k is constant, m=1, and n=1.
C k is constant, m=2, and n=2.
D k=2, and m and n are variable. - 🧠ANSWER ✔✔B k is constant, m=1,
and n=1, m+n=2nd order
,A student plans to add HCl to a solution containing Pb(NO3)2(aq). To
determine how MUCH Pb2+ will precipitate from solution when the HCl is
added, the student needs to know which of the following?
A Ka for HCl
B Ka for HNO3
C Ksp for PbCl2
D Keq for the reaction Pb2+ + 2 e- <=>Pb - 🧠ANSWER ✔✔C Ksp for
PbCl2; will tell how much ions or concentration will dissolve
if Q>Ksp, will shift backwards (precipitate)
if Q<Ksp, will shift forward until Ksp is reached (dissolution)
*Ksp=shows dissolved/precipitate concentration (for ions)
pKa=shows dissociation direction (for acids)
Keq=shows concentration at equilibrium (for general prod/react)
Which of the following electron configurations of nitrogen is the most
stable?
,A 1s^2, 2s^1, 2p^4
B 1s^2, 2s^2, 2p^3
C 1s^1, 2s^2, 2p^4
D 1s^2, 2s^2, 2p^2, 3s^1 - 🧠ANSWER ✔✔B 1s^2, 2s^2, 2p^3;
stable Nitrogen has 7electrons (fills S->P)
*e- peels off from the S->P->D->F orbitals
When a weak acid (HA) is titrated with sodium hydroxide in the presence of
an indicator (HIn), the pH at which a color change is observed depends on
the:
A final concentration of HA.
B final concentration of HIn.
C initial concentration of HA.
D pKa of HIn. - 🧠ANSWER ✔✔D pKa of HIn;
the indicator changes color only when you bypass it's threshold (pka) and
release/obtain H+
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, *indicator are usually weak acids with a (+/-) 1 buffer range
Approximately how many moles of Al3+ are reduced when 0.1 faraday of
charge passes through a cell during the production of Al? (Note: Assume
there is excess Al3+ available and that Al3+ is reduced to Al metal only.)
A 0.033 mol
B 0.050 mol
C 0.067 mol
D 0.10 mol - 🧠ANSWER ✔✔A 0.033 mol
Al+3 needs (3mol e) per reduction,
0.1faraday gives 0.1 e mol (1:1 ratio)
0.1given/3 mol need=0.033
*use the fence (0.1fara/1)(1e/1fara)(1Al+3/3e)= 0.033mol e
The following reaction occurs spontaneously. Cd(s) + 2 H+(aq) →
Cd2+(aq) + H2(g) Which of the following has the highest electron affinity?
