9. A salt, MY, crystallizes in a body-centered cubic structure with a Y^⁻ anion at each cube corner and an M⁺ cation at the cube center. Assuming that the Y^⁻ anions touch each other and the M⁺ cation at the center, and that the radius of Y^⁻ is 158 pm, what is the radius of M⁺?
(A)65.4 pm
(B)116 pm
(C)79.0 pm
(D)41.1 pm
(E)105.3 pm

5. For which one of the following reactions is the value of ∆Ho rxn equal to ∆Ho f for the product? (A)2Ca(s) + O2(g)→ 2CaO(s) (B)C2H2(g) + H2(g)→ C2H4(g) (C) 2C(graphite) + O2(g)→ 2CO(g) (D)3Mg(s) + N2(g)→ Mg3N2(s) (E) None of these

6. A mole of yellow photons of wavelength 527 nm has ________ kJ of energy. (A)165(B)227 (C) 4.56 × 10-46 (D)6.05 × 10-3 (E)527

 7. Using the following data reactions:Calculate the energy of an H–Cl bond.(A)770kJ(B)856 kJ(C)518 kJ (D)487 kJ(E)428 kJ 

 28. Which of the following has the greatest bond strength? (A)B₂(B)O₂⁻(C)CN⁻ (D)O₂⁺(E)H2

10. When 0.014 mol of a weak acid HA is dissolved in enough water to make 1.0 L of solution, [H ⁺] is 1.8x10-3 M. Calculate the freezing point of this solution. Assume that the molarity concentration is equal to the molality concentration, and assume ideal behavior. *Kf (H₂O) is 1.86°C∙kg/mol. (A)-0.029°C(B)-0.026°C(C)-0.058°C (D)+0.029°C(E)+0.058°C

11. The kinetics of the reaction A + 3B→ C + 2D were studied and the following results obtained, where the rate law is: -∆[A]/ ∆t = k[A]n [B]m. For a run where [A]0= 1.0x10-3 M and [B]0= 5.0 M, a plot of ln[A] versus t was found to give a straight line with slope = -5.0x10-2 s -1 . For a run where [A]0= 1.0x10-3 M and [B]0= 10.0 M, a plot of ln[A] versus t was found to give a straight line with slope = -7.1x10-2 s -1 . Calculate the value of k (ignore units). (A)11(B)10(C)50 (D)1.1(E)22

12. A possible mechanism for the overall reaction: Br2(g) + 2NO(g)→ 2NOBr(g) : NO(g) + Br2(g) ←→ NOBr2(g) (fast; rate constant for forward reaction is k1 and k-1 for reverse reaction) NOBr2(g) + NO(g)→ 2NOBr2(g) (slow; rate constant is k2) The rate law for formation of NOBr based on this mechanism is rate = ________. (A)k1[NO]½ (B)k1[Br₂]½ (C) (k2k1/k-1)[NO]²[Br₂] (D)(k1/k-1)2[NO]² (E)k2[NOBr2][NO]

13. For the reaction CaCO₃(s) ←→ CaO(s) + CO₂(g), Kp = 1.16 at 800.°C. If a 21.1 gram sample of CaCO₃ is put into a 10.0 L container and heated to 800°C, what percent of the CaCO₃ will react to reach equilibrium? (A)32.3%(B)62.5%(C)83.8% (D)41.9%(E)100.0%

14. What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO₃ ? (Ka of HIO₃ = 0.16) (A)1.52(B)0.80(C)0.72 (D)0.89(E)1.10

15. Consider the titration of 100.0 mL of 0.250 M aniline (Kb = 3.8x10-10) with 0.500 M HCl. Calculate the pH of the solution at the stoichiometric point. (A)-0.85(B)8.70(C)2.68 (D)11.62(E)7.00