107年 - 107 高雄醫學大學_學生轉系考：普通化學#86774

1. A correct name for Fe(NO₃)₂ is ________. (A)Iron nitrite(B)Ferrous nitrite(C)Ferric nitrite (D)Iron nitrate(E)Ferrous nitrate

2. A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is (A)CH₂O (B).C₃H₄O(C)CH₄O₃ (D)C₃H₄O₂(E)CH₄O₂

3. Which compound has the atom with the highest oxidation number? (A)CaS(B)Na₃N(C)MgSO₃ (D)Al(NO₂)₃(E)NaCl

4. Which of the following statements is false? (A)The density of a gas is directly proportional to the external pressure.(B)The density of helium gas is double that of hydrogen gas.(C)The density of a gas is indirectly proportional to the temperature in Kelvin. (D)All gases have the same density at STP.(E) All the statements above are correct.

5. For which one of the following reactions is the value of ∆Ho rxn equal to ∆Ho f for the product? (A)2Ca_(s)+ O_2(g)→ 2CaO_(s) (B)C₂H_2(g) + H_2(g)→ C₂H_4(g) (C) 2C(graphite) + O_2(g)→ 2CO_(g)(D)3Mg_(s) + N_2(g)→ Mg₃N_2(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

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

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^-3M and [B]₀= 5.0 M, a plot of ln[A] versus t was found to give a straight line with slope = -5.0x10^-2s^-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^-2s ^-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: Br_2(g) + 2NO_(g)→ 2NOBr_(g) : NO_(g) + Br_2(g)←→ NOBr_2(g)(fast; rate constant for forward reaction is k₁ and k_-1 for reverse reaction) NOBr_2(g)+ NO_(g)→ 2NOBr_2(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[Br_₂]½ (C) (k₂k₁/k_-1)[NO]²[Br₂] (D)(k₁/k_-1)2[NO]² (E)k₂[NOBr₂][NO]

13. For the reaction CaCO_₃(s) ←→ CaO_(s) + CO₂(g), K_p = 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 ? (K_a 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 (K_b = 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

16. The Kf for the complex ion Ag(NH₃) ²⁺ is 1.7x10⁷ . The Ksp for AgCl is 1.6x10^-10. Calculate the molar solubility of AgCl in 1.0 M NH₃. (A)5.2x10^-2 M(B)4.7x10^-2 M(C)2.9x10^-3 M (D)1.3x10^-2M(E)3.5x10^-2 M

17. The equilibrium constant K for the dissociation reaction of a molecule X₂

X_2(g)←→ 2X_(g)

was measured as a function of temperature (in Kelvin). A graph of ln K versus 1/T for this reaction gives a straight line with a slope of –1.352x10⁴ and an intercept of 15.59 K. The value of ∆S for this dissociation reaction is: (A)1.875 J/K mol(B)259.2 J/K mol(C)32.4 J/K mol (D)64.81 J/K mol(E)129.6 J/K mol

18. An excess of finely divided iron is stirred up with a solution that contains Cu²⁺ ion, and the system is allowed to come to equilibrium. The solid materials are then filtered off and electrodes of solid copper and solid iron are inserted into the remaining solution. What is the value of the ratio [Fe²⁺]/[Cu²⁺] at 25°C? The following standard reduction potentials apply: (A)1(B)1.3x10²⁶(C)2.5x10²⁶ (D)4.4x10^-27(E)8.8x10^-27

19. Rubidium–87 decays by beta decay with a half-life of 4.9×10¹⁰ years. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour? (A)9.0×10¹⁶ atoms (B)4.3×10⁻⁴ atoms (C) 2.2×10¹⁸ atoms (D)2.5×10¹⁴ atoms (E)2.6×10¹⁵ atoms

20. What two oxidation states are more frequently observed in the first transition series than in the third? (A)+3 and +7 (B)+2 and +3 (C) +2 and +7 (D)+5 and +6 (E)+2 and +5

21. Give the number of geometrical isomers for the octahedral compound [MA₂B₂C₂], where A, B, and C represent ligands. (A)1(B)2(C)3 (D)5(E)6

22. A particular first order reaction has a rate constant of 1.35×10² s⁻¹ at 25.0 °C. What is the magnitude of k at 75.0 °C if Ea = 55.3 kJ/mol? (A)2.24 × 10⁴(B)3.34 × 10³(C)433 (D)1.05 × 10³(E)2.49 × 10⁶

23. For a particular reaction in a galvanic cell ∆S° is negative. Which of the following statements is true? (A)E⁰will increase with an increase in temperature. (B)E⁰will decrease with an increase in temperature. (C) E⁰will not change when the temperature increases. (D)∆G° > 0 for all temperatures. (E)None of these

24. Consider the reaction: NH₃(g) + HCl(g) → NH₄Cl(s)

Given the following table of thermodynamic data at 298 K, the value of equilibrium constant for the reaction at 25 °C is ________.

Substance ∆Hf o (kJ/mol)) So (J/K・mol) NH3(g) -46.19 192.5 HCl(g) -92.30 186.69 NH4Cl(s) -314.4 94.6 (A)150(B)9.3×1015(C)8.4×10⁴ (D)1.1×10-16(E)7.2×1012

25. The molar enthalpy of vaporization of hexane (C₆H₁₄) is 28.9 kJ/mol, and its normal boiling point is 68.73°C. What is the vapor pressure of hexane at 25°C? (A)4.44 torr(B)117 torr(C)241 torr (D)759 torr(E)171 torr

107年 - 107 高雄醫學大學_學生轉系考：普通化學#86774

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