100年 - 100 台灣聯合大學系統_學士班轉學生考試試題_A1A5：普通化學#139137

1. A beam of light with an intensity of 15 W is. incident on a copper plate (work function is7.43xl0-19 J). Electrons with a minimum wavelength of 3.75x10 ^－10 m are ejected from the surface of the copper. Calculate the frequency of the incident light. [Hint: Plank constant = 6.626 x 10^－34J·s] (A)3.7lx10¹⁵Hz (B) 3.71 x 10¹⁶ Hz,(C) 3.71 x 10¹⁷ Hz,(D) 3.71 x 10¹⁸Hz(E) none of above

2. If a new light source (its energy is7.19x10^-19 J) with an intensity of 35 Wis incident on the copper surface, what is the maximum number of electrons that can be ejected from a 6.0 second pulse of light? (A)O, (B) 3.71x10 ¹⁶ ,(C) 3.7lx10 ¹⁷,(D) 3.7lx10 ¹⁸,(E) none of above

3. Order the following atoms and ions in order of increasing atomic radius: Cl,Te,Te^2-,S (A) Cl< Te< S < Te^2-, (B) Cl< S < Te^2- <Te, (C) Te^2- <Te< S <CL, (D) Cl< S <Te< Te²
 (E)none of above

4. How many electrons in a single atom can have the following two quantum numbers: n = 7, m_I =－3? (A)2, (B)4, (C)6, (D)8, (E) none of above

5. Calculate the pH in a,solution prepared by dissolving 0.050 mol of acetic acid (CH₃COOH) and 0.20 mol of sodium acetate (NaCH3COO) in water and adjusting the volume to 500 mL. The pKa for acetic (CH₃COOH) is 4.75.

[Hint: log(0.25) = -0.602] (A)4.35, (B)S.35, (C)6.35, (D)7.35, (E) none of above

6. A 10.0 mL sample of 0.20 M HNO_{2(aq )} solution is titrated with 0.10 M NaOH_(aq)• (Ka of HNO₂ is 4.3x10 ^-4 ).Initial mol of NO₂^- is 0.0667 M. Calculate_ the pH at the equivalence point. (Hint: log(I.Z47x 10^-6＝－5．9I (A)S.1, (B)6.1, (C)7.1, (D)S.1, (E) none of above

7. . Consider the formation of MgO_{( s)} • Assume that △H° and △S° are independent of temperature. Calculate the temperature at which the formation of MgO switches. from spontaneous to non-spontaneous or vice versa?

 [Hint: Mg_(s) 十➔MgO_(s） ；△H° = -602kJ I mo!; △S° = -1081 I K · mol] (A)2,574K, (B)3,574K, (C)4,574K, (D)5,574K, (E) none of above

8. Oxygen at pressures that are not too high obeys the equation P(V - b) = RT, Where P is pressure; V is volume, R is 8.314 JK^-1mol^-¹, T is temperature, b =0.021dm³/mol, Estimate the fugacity of oxygen at 25°C and 1 bar pressure. 

[Hint: The equation of state is Where P₁ is 0 bar]  (A) (B) (C)(D) (E)

9.The equilibrium constant for an association reaction A+B ABis 1.8x10³ dm³ / mol at 25°C and 3.45×10³ dm³ / molat 40°C. Assuming AHto be independent of temperature, calculate △H⁰=? [Hint: =0.651 (A)33.67 J/mol; (B) 336.7 J/mol; (C) 3367 J/mol; (D) 33.67 kJ/mol; (E) 336.7 kJ/mol;

10. A solution contains 1.50 g of solute in 30.0 g of benzene and its freezing point is 3.74°C. The freezing point of pure benzene is 5.48°C. Calculate the molar mass of the solute. [Hint: Freezing point depression constant (K_f) for benzene is 4.9°C.kg/ mol] (A)1.47g/mol, (B)14.7g/mol, (C)147g/mol, (D)1,470g/mol, (E)14.7kg/mol

11. Toluene (methylbenzene) and water are immiscible. If boiled together under an atmosphere pressure of 755.0 Torr at 83°C, what is the ratio of toluene to water (W_toluene/W_water)in the distillate? The vapor pressure of pure toluene and water 83°C are 322.0 Torr and 400.6 Torr, respectively. (W_toluene/W_water)=(A) 1.11, (B) 2.11, (C) 3.11, (D) 4.11, (E) 5.11

12. An aqueous solution of gold(III) nitride, Au(NO₃)₃, was electrolyzed with a current of0.0250A until 1.200g of Au (atomic weight 197.0) had been deposited at the cathode. Calculate the quantity of electricity passed.

[Hint: The reaction at the cathode is 3e^- + Au³⁺ → Au; The equation for the libration of O₂ is 2H₂O→O₂+4H⁺ +4e^-] (A)1.76 C, (B) 17.6C, (C) 176C, (D) 1,760C, (E) 17,600C

13. The Electromotive Force (emf) ofthe cell Pt,H₂(lbar)|HCI(0.01m) AgCl(s)|Ag is 0.2002V at 25°C, is –8.665×10^-5V/K.

 [Hint: The electrode reactions of cell are ；The cell reaction is + AgCl_(s) → Ag + H⁺ +Cl^-; e =1.602x10^-19C]

The Gibbs energy change of the cell reaction is △ G = (A) -1.932 J/mol ,(B) -19.32 J / тol ,(C) -193.2 J/mol,(D) -1,932 J/mol ,(E) -19,320 J/ mol

14. What is the degree of the degeneracy if the three quantum numbers m,n,and n, can have the values 1, 2, and 3? (A) 2, (B) 4, (C) 6, (D) 8, (E) 10

15. KF has an ionic bond with a bond length of 0.217nm. Calculate the AE in kj/mol, for the formation of a KF bond from the neutral atoms K and F. For this calculation, assume that the potassium and fluorine ions are point charges. Ionization Energy and Electron Affinity for K and F are provided in the table below.

 [Hint: Overall: K+F →KF ； ε₀= 8.854×10^-12 C²/J-m; e =1.602×10^-19 C]

 (A) -5.50×10^-² J/mol, (B) -55 J/mol, (C) -550 J/mol, (D) -550 kJ/mol, (E) -5,500 kJ/mol

16. Among_______ , which one is ionic crystal?(A) NaCl, (B) SiO₂, (C) CH₄, (D) CO₂ and (E) Fe

17. Among ________, which one has highest melting point?(A) NaCl, (B) SiO₂, (C) CH₄, (D) CO₂ and (E) Fe

18. The structure of the amino acid histidine is provided below. For the indicated bond b,

 What could form the bonds ofN-C bond, b? (A)σ(N : 2sp² ; C : 2sp²)(B) π(N: 2p_y;C: 2p_y) (C) π(N:2p_x;C:2p_x), (D) σ(N:2sp³ ;C:2sp³ );(E) σ(O: 2sp³ ;H: ls)

19. Determine the bond order (BO) of the cyanide molecule, CN and the cyanide ion, CN^-1 Bond order (BO) of (A) CN is 0.5; CN^-1 is 1, (B) CN is 1.5; CN^-1 is 2, (C) CN is 2.5; CN^-1 is 3 , (D) CN is 3.5; CN^-1 is 4, (E) CN is 4.5; CN^-1 is 5

20. Consider the reaction below for the conversion nitrogen dioxide to nitric oxide and O₂. Calculate the △H° (per mole of O₂ formed) for the reaction at 298 K.

 [Hint:2NO_2(g) → 2NO_(g) +O_2(g)；△H^0formation  (NO_2(g))= 33k.J I mol；△H^0formation (NO_(g)) = 90k.J /mo/] (A)114.1 J, (B) 1.141 kJ, (C) 11.41 kJ, (D) 114.1 kJ, (E) 1,141 kJ

21. Which of the following has the highest energy per photon? (A) infrared, (B)blue light, (C)green light, (D)orange light, (E)red light

22. Metals rarely lose electrons in chemical reacti(:ms because (A) their electron affinities are too high. (B) their ionic radii become too small. (C) their ionization energies are too small. (D) their size is too small. (E).their ionization energies are too high.

23. What is the shape of ? (A)T-shaped, (B)trigonal pyramidal , (C)seesaw, (D)tetrahedral, (E) trigonal planar

24. A plot of the Maxwell distribution for the same gas against temperature shows that (A) at high temperatures, most molecules have speeds close to their average speed. (B) as the temperature increases, a high proportion of molecules have very slow speeds. (C) as the temperature decreases, the spread of speeds widens.(D)as the temperature decreases, a high proportion of molecules have very high speeds. (E) at low temperatures, most molecules have speeds close to their average speed.

25. Which of the following statements is true? (A) 1,1-Dichloro-2-methyl-1-propene has a. . higher boiling point than trans-2,3-dichloro-2-butene. (B)CH₄ has a higher boiling point than CCl₄. (C)o-Dichlorobe11:zene has a lower boiling point than p-dichlorobenzene.(D)HI has a lower boiling point than HBr. (E) Butane, C₄H₁₀, has a higher boiling point than acetone, CH₃COCH₃. 

26. How do alloys solidify and melt? (A)At precise temperature. (B)Over a range of temperatures. (C)At temperature. (D)At exact low temperature. (E)None of above. strict high

27. Gamma-rays cause radiation damage when they interact with matter by producing (A) ions and free radicals, (B) isotopes, (C) daughter products,(D)oxidation, (E) reduction.

28. Which of the following has the lowest standard molar entropy? (A) C_(graphite), (B) p _4(s), (C) S_8(s), (D) C_60(s), (E) C_(diamond)

29. Which of the following liquids freeze at a lower temperature when pressure is applied? (A)water, (B)acetic acid, (C)benzene, (D)methanol, (E)carbon tetrachloride

30. Which of the following 0.10 M aqueous solutions has the lowest pH? (A) B(OH)3, (B) HIO, (C) C2H5NH3Cl ,(D)C6HsOH

31. Choose the effective pH range of an aniline/anilinium chloride buffer. The value of the Kb for aniline is 4.3 x 10-1u. 一10 (A)3.6"'5.6, (B) 8.4~�0.4, (C) l.1~3.1, (D) 5.1~7.1, (E) 10.1~12.1

32. If the standard potentials for the couples Cu2+ /Cu, Ag+ /Ag, and Fe2+ /Fe are +0.34, +0.80, and -0.44 V, respectively, which is the strongest reducing agent? (A) Fe, (B) Ag, (C) Ag + , (D) Cu, (E) Fe2 +

33. If the rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1, the order of the reaction with respect to this reactant is (A) 1.5, (B) 3, (C) 4,(D)2, (E) 1

34. Which of the foil owing does not act as a Lewis acid? (A) Na20, (B) NO, (C) N02,(D)S03, (E) CO2