ACS Gen Chem 2 Final Exam Study Guide with Complete Solutions

ACS Gen Chem 2 Final Exam Study Guide with Complete Solutions C - ️️ Correct-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 - ️️ Correct-Which molecule is most soluble in water? D - ️️ Correct-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 - ️️ Correct-What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C2H5OH? TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 2/22 Molar Mass C2H3OH = 46 g/mol (A) 0.11 (B) 0.24 (C) 0.32 (D) 0.76 D - ️️ Correct-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 - ️️ Correct-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 TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 3/22 (D) decreasing the volume of solution D - ️️ Correct-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 - ️️ Correct-Which 0.1 molal aqueous solution will have the lowest freezing point? (A) Al(NO3)3 (B) CaCl2 (C) C2H5OH (D) NaCl B - ️️ Correct-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 TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 4/22 (C) rate = k[H2]^2 [NO]^2 (D) rate = k[N2] [H2O]^2 / [H2]^2 [NO]^2 B - ️️ Correct-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 - ️️ Correct-The half-life for the first order conver