ACS Gen Chem 2 Final Exam Study Guide
Study online at https://quizlet.com/_7nki6q
1. 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
2. C: Which molecule is most soluble in water?
3. 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
4. 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
5. 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
6. 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
, ACS Gen Chem 2 Final Exam Study Guide
Study online at https://quizlet.com/_7nki6q
(C) increasing the volume of solution
(D) decreasing the volume of solution
7. 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
8. A: Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl
9. 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
10. 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
11. 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
Study online at https://quizlet.com/_7nki6q
1. 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
2. C: Which molecule is most soluble in water?
3. 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
4. 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
5. 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
6. 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
, ACS Gen Chem 2 Final Exam Study Guide
Study online at https://quizlet.com/_7nki6q
(C) increasing the volume of solution
(D) decreasing the volume of solution
7. 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
8. A: Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl
9. 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
10. 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
11. 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
