OP 2025 CHEM
T
151 EXAM WITH
Q&A 100%
GUARANTEED
ANSWERS A+
SCORE
xam 3
e
Indicators of spontaneity: G is negative, K
is greater than 1, E cell is positive
all of them
6 Fe²⁺ + Cr₂O₇²⁻ + 14 H⁺ → 2 Cr³⁺ + 6 Fe³⁺ +
7 H₂O
ANSWER—Fe2+ is oxidized
hat's the oxidation number of S in the
w
compound Na₂S₂O₅
ANSWER—+4
alculate E°cell for the following reaction
C
given the standard reduction potentials
below?
:Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)
Standard Reduction PotentialsZn2+ (aq) +
2e- → Zn (s) -0.763 VCu2+ (aq) + 2e- →
Cu (s) +0.34 V
ANSWER— +1.1 V
hat is the half-life for the second order
W
decomposition of O3 when the
concentration of O3 is 2.35 × 10−6M? The
rate constant for this second-order reaction
is 50.4 M−1hr−1
ANSWER— 8.4 x 10^3 hr
, three-step mechanism for the reaction of
A
(CH3)3CBr and H2O is proposed?
Step 1 Slow (CH3)3CBr → (CH3)3C+ + Br-
Step 2 Fast (CH3)3C+ + H2O →
(CH3)3COH2+
Step 3 Fast (C
H3)3COH2+ + Br- →
(CH3)3COH + HBr
Which is the rate-determining step?
ANSWER— step 1. slow step
hich of the following is the overall
W
reaction described by the mechanism in
problem 6 above?
ANSWER— (CH3)3CBr + H2O →
(CH3)3COH + HBr
he reaction of NO2(g) and CO(g) is
thought to occur in two steps:
Step 1 NO + NO → N2O2
Step 2 N2O2 + O2 → 2NO2
hich if the following is an intermediate?
W
ANSWER— N2O2
se the method of initial rates to determine
U
the rate law for the reaction of nitrous oxide
and oxygen.
2 NO(g) + O2(g) → 2 NO2(g) Rate =
k[NO]m[O2]n
( view table )
ANSWER—rate = k[NO]2[O2]
hich of the following changes would
W
quadruple the rate of reaction with a rate
law of rate = k[A][B]2?
ANSWER— double [B]
ased on the Figure below, is Reaction A
B
or Reaction B catalyzed? What is the role
of a catalyst
ANSWER—(reaction b has less
activation energy)
reaction b is catalyzed. the catalyst
speeds up a reaction by changing the
T
151 EXAM WITH
Q&A 100%
GUARANTEED
ANSWERS A+
SCORE
xam 3
e
Indicators of spontaneity: G is negative, K
is greater than 1, E cell is positive
all of them
6 Fe²⁺ + Cr₂O₇²⁻ + 14 H⁺ → 2 Cr³⁺ + 6 Fe³⁺ +
7 H₂O
ANSWER—Fe2+ is oxidized
hat's the oxidation number of S in the
w
compound Na₂S₂O₅
ANSWER—+4
alculate E°cell for the following reaction
C
given the standard reduction potentials
below?
:Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)
Standard Reduction PotentialsZn2+ (aq) +
2e- → Zn (s) -0.763 VCu2+ (aq) + 2e- →
Cu (s) +0.34 V
ANSWER— +1.1 V
hat is the half-life for the second order
W
decomposition of O3 when the
concentration of O3 is 2.35 × 10−6M? The
rate constant for this second-order reaction
is 50.4 M−1hr−1
ANSWER— 8.4 x 10^3 hr
, three-step mechanism for the reaction of
A
(CH3)3CBr and H2O is proposed?
Step 1 Slow (CH3)3CBr → (CH3)3C+ + Br-
Step 2 Fast (CH3)3C+ + H2O →
(CH3)3COH2+
Step 3 Fast (C
H3)3COH2+ + Br- →
(CH3)3COH + HBr
Which is the rate-determining step?
ANSWER— step 1. slow step
hich of the following is the overall
W
reaction described by the mechanism in
problem 6 above?
ANSWER— (CH3)3CBr + H2O →
(CH3)3COH + HBr
he reaction of NO2(g) and CO(g) is
thought to occur in two steps:
Step 1 NO + NO → N2O2
Step 2 N2O2 + O2 → 2NO2
hich if the following is an intermediate?
W
ANSWER— N2O2
se the method of initial rates to determine
U
the rate law for the reaction of nitrous oxide
and oxygen.
2 NO(g) + O2(g) → 2 NO2(g) Rate =
k[NO]m[O2]n
( view table )
ANSWER—rate = k[NO]2[O2]
hich of the following changes would
W
quadruple the rate of reaction with a rate
law of rate = k[A][B]2?
ANSWER— double [B]
ased on the Figure below, is Reaction A
B
or Reaction B catalyzed? What is the role
of a catalyst
ANSWER—(reaction b has less
activation energy)
reaction b is catalyzed. the catalyst
speeds up a reaction by changing the
