ACS Gen Chem 2 Final Exam
(ANSWERED) CORRECTLY TO SCORE A+
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 - Correct
Answers ✅C, region 3
Which molecule is most soluble in water? - Correct Answers
✅C
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*10^-3 m
(D) 4.41+10^-3 m - Correct Answers ✅C, 3.51*10^-3 m
What is the mole fraction of water in 200 g of 89% (by mass)
ethanol, C2H5OH?
,ACS Gen Chem 2 Final Exam
(ANSWERED) CORRECTLY TO SCORE A+
Molar Mass C2H3OH = 46 g/mol
(A) 0.11
(B) 0.24
(C) 0.32
(D) 0.76 - Correct Answers ✅B, 0.24
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) 1.8 g
(C) 3.1 g
(D) 6.2 g - Correct Answers ✅D, 6.2 g
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
, ACS Gen Chem 2 Final Exam
(ANSWERED) CORRECTLY TO SCORE A+
(D) decreasing the volume of solution - Correct Answers
✅A, the cooling solution
Which 0.1 molal aqueous solution will have the lowest
freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl - Correct Answers ✅A, Al(NO3)3
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 - Correct
Answers ✅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
(ANSWERED) CORRECTLY TO SCORE A+
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 - Correct
Answers ✅C, region 3
Which molecule is most soluble in water? - Correct Answers
✅C
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*10^-3 m
(D) 4.41+10^-3 m - Correct Answers ✅C, 3.51*10^-3 m
What is the mole fraction of water in 200 g of 89% (by mass)
ethanol, C2H5OH?
,ACS Gen Chem 2 Final Exam
(ANSWERED) CORRECTLY TO SCORE A+
Molar Mass C2H3OH = 46 g/mol
(A) 0.11
(B) 0.24
(C) 0.32
(D) 0.76 - Correct Answers ✅B, 0.24
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) 1.8 g
(C) 3.1 g
(D) 6.2 g - Correct Answers ✅D, 6.2 g
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
, ACS Gen Chem 2 Final Exam
(ANSWERED) CORRECTLY TO SCORE A+
(D) decreasing the volume of solution - Correct Answers
✅A, the cooling solution
Which 0.1 molal aqueous solution will have the lowest
freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl - Correct Answers ✅A, Al(NO3)3
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 - Correct
Answers ✅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
