ACS Gen Chem 2 Final Exam Study Guide ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS

ACS Gen Chem 2 Final Exam Study Guide ACTUAL UPDATED QUESTIONS AND
CORRECT ANSWERS

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