5. How many of the following compounds have optical isomers?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

6. Which compound has the strongest dispersion force among them? (A) CO2 (B) H2S (C) C6H6 (D) CH4 (E) PH3

7. In an electrolysis cell, a constant current of 1.90 A is passed through an aqueous $CuCl_2$ solution for 15.0 min. At the end of the experiment, 0.468 g of Cu(s) is obtained as the target reduction product. What fraction of the electrons passed through the circuit was successfully used to produce Cu(s)? (A) 20.8% (B) 41.6% (C) 62.4% (D) 83.1% (E) 100%

8. What says the third law of thermodynamics? (A) The entropy of the universe never decreases. (B) The entropy of a perfect crystal at 0 K is zero. (C) Energy is distributed evenly between different degrees of freedom. (D) The total energy of the universe is conserved. (E) Both internal energy U and enthalpy H are state functions.

9. The following data were collected for the reaction between $H_2$ and NO at $700^{\circ}C$: The rate law of this reaction can be written as: $rate = (P{H2})^x(P{NO})^y$. Determine the coefficients x and y. (A) x=1, y=0 (B) x=1, y=1 (C) x=1, y=2 (D) x=2, y=0 (E) x=2, y=1

10. Which compound is expected to have the highest melting point? (A) BaCl2 (B) HClO3 (C) C2H5OH (D) C6H12O6

11. Which of the following polymers is NOT synthesized by addition polymerization? (A) PP (B) PVC (C) PS (D) Teflon (E) PET

12. A gas has a mass of 30.8 grams and occupies \(9.24 \times 10^6\) mm3 at 0.873 atm and 21 °C. Assuming ideal gas behavior, determine the molar mass of this gas. (A) 16.0 g mol-1 (B) 44.1 g mol-1 (C) 70.9 g mol-1 (D) 92.1 g mol-1 (E) 106.2 g mol-1

13. Which graph below describes the vapor pressures (total and individual) of an ethanol (C2H5OH) and hexane (C6H14) mixture? Mixing ethanol and hexane is (A) I; endothermic (B) I; exothermic (C) II; endothermic (D) II; exothermic (E) III; endothermic

14. In the development of the hydrogen economy, one of the most crucial challenges is safely storing hydrogen gas. For example, magnesium metal has the hcp (hexagonal close-packed) lattice structure and can use the empty space between Mg atoms (interstitial sites) to store smaller hydrogen molecules. The overall reaction can be represented as: Mg(s) + H2(g) ⇌ MgH2(s) The equilibrium pressures of hydrogen gas at different temperatures are plotted in the figure to the right. Based on these data, what are the signs of ΔH and ΔS for this reaction? (A) ΔH > 0, ΔS > 0 (B) ΔH < 0, ΔS < 0 (C) ΔH < 0, ΔS > 0 (D) ΔH > 0, ΔS < 0 (E) There is no sufficient information to determine the signs of ΔH and ΔS

15. After adding 10 mL of 0.15 M KOH into 30 mL of 0.08 M HNO2 (Ka = 4.5 x 10-4), which of the following statements is NOT correct? (A) The neutralization reaction between KOH and HNO2 almost reaches completion. (B) The solution has a higher buffer capacity against strong bases than against strong acids. (C) The solution pH is still within the most effective buffer range. (D) The solution pH is approximately 3.57. (E) Compared to the original solution, the percent ionization of HNO2 is decreased. 

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