ACS GEN CHEM 2 FINAL EXAM WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS RATED A+ LATEST
UPDATE
C
Where is the hydrophilic (attracted to water) region of the molecule?
(A) Region 1
(B) Region 2
(C) Region 3
(D) The three regions are equally hydrophilic
C
Which molecule is most soluble in water?
D
A solution of NaCl in water has a concentration of 20.5% by mass. What is the molal
concentration of the solution?
Molar Mass NaCl = 58.44 g/mol
(A) 0.205 m
(B) 0.258 m
(C) 3.51 m
(D) 4.41 m
B
What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C2H5OH?
Molar Mass C2H3OH = 46 g/mol
(A) 0.11
(B) 0.24
(C) 0.32
(D) 0.76
D
,A mixture of 100 g of K2Cr2O7 and 200 g of water is stirred at 60 degrees C until no more of the
salt dissolves. The resulting solution is poured off into a separate beaker, leaving the
undissolved solid behind. The solution is now colled to 20 degrees C. What mass of K2Cr2O7
crystallizes from the solution during the cooling?
(A) 9 g
(B) 18 g
(C) 31 g
(D) 62 g
A
Carbonated beverages have a fizz because of gas dissolved in the solution. What increases the
concentration of gas in a solution?
(A) cooling the solution
(B) heating the solution
(C) increasing the volume of solution
(D) decreasing the volume of solution
D
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the freezing point was
lowered by 6.36 degrees C. What is the identity of this unknown compound?
Kf for water = 1.86 degrees C/m
(A) CsCl
(B) KCl
(C) LiF
(D) NaCl
A
Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl
B
,What is the rate law of this reaction?
2H2 (g) + 2NO (g) --> N2 (g) + 2H2O (g)
(A) rate = k[H2]^2 [NO]
(B) rate = k[H2] [NO]^2
(C) rate = k[H2]^2 [NO]^2
(D) rate = k[N2] [H2O]^2 / [H2]^2 [NO]^2
B
The rate law for the reaction
A + B --> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the
reaction will
(A) remain the same
(B) be increased by a factor of 2
(C) be increased by a factor of 4
(D) be increased by a factor of 8
C
The half-life for the first order conversion of cyclobutene to ethylene,
C4H8 (g) --> 2C2H4 (g)
is 22.7 s at a particular temperature. How many seconds are needed for the partial pressure of
cyclobutane to decrease from 100 mmHg to 10 mmHg?
(A) 0.101 s
(B) 52.0 s
(C) 75.5 s
(D) 5233 s
A
The half-life for the first-order radioactive decay of 32P is 14.3 days. How many days would be
required for a sample of a radio pharmaceutical containing 32P to decrease to 20.0% of its initial
activity?
(A) 33.0 d
(B) 49.2 d
, (C) 71.0 d
(D) 286 d
D
Plots are shown for the reaction N02 (g) --> NO (g) + 1/2 O2 (g)
What is the rate law for the reaction?
(A) rate = k
(B) rate = k x 1/[NO2]
(C) rate = k[NO2]
(D) rate = k[NO2]^2
A
What changes when a catalyst is added to the reaction described by this energy diagram?
(A) I and II
(B) I and III
(C) I only
(D) III only
C
Which statement regarding chemical reactions is true according to collision theory?
(A) All molecular collisions result in chemical equations.
(B) Catalysts make individual collisions more effective, increasing reaction rates.
(C) Proper orientation of molecules is required for collision to result in chemical reactions.
(D) Increasing the temperature of a reaction decreases the kinetic energy of molecules, making
collisions more effective.
B
The activation energy for a particular reaction is 83.1 kJ/mol. By what factor will the rate
constant increase when the temperature is increased from 550.0 degrees C to 60.0 degrees C?
(A) 2.53
(B) 1.00
(C) 0.927
(D) 0.395
QUESTIONS AND VERIFIED ANSWERS RATED A+ LATEST
UPDATE
C
Where is the hydrophilic (attracted to water) region of the molecule?
(A) Region 1
(B) Region 2
(C) Region 3
(D) The three regions are equally hydrophilic
C
Which molecule is most soluble in water?
D
A solution of NaCl in water has a concentration of 20.5% by mass. What is the molal
concentration of the solution?
Molar Mass NaCl = 58.44 g/mol
(A) 0.205 m
(B) 0.258 m
(C) 3.51 m
(D) 4.41 m
B
What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C2H5OH?
Molar Mass C2H3OH = 46 g/mol
(A) 0.11
(B) 0.24
(C) 0.32
(D) 0.76
D
,A mixture of 100 g of K2Cr2O7 and 200 g of water is stirred at 60 degrees C until no more of the
salt dissolves. The resulting solution is poured off into a separate beaker, leaving the
undissolved solid behind. The solution is now colled to 20 degrees C. What mass of K2Cr2O7
crystallizes from the solution during the cooling?
(A) 9 g
(B) 18 g
(C) 31 g
(D) 62 g
A
Carbonated beverages have a fizz because of gas dissolved in the solution. What increases the
concentration of gas in a solution?
(A) cooling the solution
(B) heating the solution
(C) increasing the volume of solution
(D) decreasing the volume of solution
D
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the freezing point was
lowered by 6.36 degrees C. What is the identity of this unknown compound?
Kf for water = 1.86 degrees C/m
(A) CsCl
(B) KCl
(C) LiF
(D) NaCl
A
Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl
B
,What is the rate law of this reaction?
2H2 (g) + 2NO (g) --> N2 (g) + 2H2O (g)
(A) rate = k[H2]^2 [NO]
(B) rate = k[H2] [NO]^2
(C) rate = k[H2]^2 [NO]^2
(D) rate = k[N2] [H2O]^2 / [H2]^2 [NO]^2
B
The rate law for the reaction
A + B --> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the
reaction will
(A) remain the same
(B) be increased by a factor of 2
(C) be increased by a factor of 4
(D) be increased by a factor of 8
C
The half-life for the first order conversion of cyclobutene to ethylene,
C4H8 (g) --> 2C2H4 (g)
is 22.7 s at a particular temperature. How many seconds are needed for the partial pressure of
cyclobutane to decrease from 100 mmHg to 10 mmHg?
(A) 0.101 s
(B) 52.0 s
(C) 75.5 s
(D) 5233 s
A
The half-life for the first-order radioactive decay of 32P is 14.3 days. How many days would be
required for a sample of a radio pharmaceutical containing 32P to decrease to 20.0% of its initial
activity?
(A) 33.0 d
(B) 49.2 d
, (C) 71.0 d
(D) 286 d
D
Plots are shown for the reaction N02 (g) --> NO (g) + 1/2 O2 (g)
What is the rate law for the reaction?
(A) rate = k
(B) rate = k x 1/[NO2]
(C) rate = k[NO2]
(D) rate = k[NO2]^2
A
What changes when a catalyst is added to the reaction described by this energy diagram?
(A) I and II
(B) I and III
(C) I only
(D) III only
C
Which statement regarding chemical reactions is true according to collision theory?
(A) All molecular collisions result in chemical equations.
(B) Catalysts make individual collisions more effective, increasing reaction rates.
(C) Proper orientation of molecules is required for collision to result in chemical reactions.
(D) Increasing the temperature of a reaction decreases the kinetic energy of molecules, making
collisions more effective.
B
The activation energy for a particular reaction is 83.1 kJ/mol. By what factor will the rate
constant increase when the temperature is increased from 550.0 degrees C to 60.0 degrees C?
(A) 2.53
(B) 1.00
(C) 0.927
(D) 0.395
