ACS GEN CHEM 2 FINAL EXAM STUDY
GUIDE WITH COMPLETE SOLUTIONS 100%
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 1 / 3
(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 2 / 3
(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
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