9. The van der Waals equation is expressed as = nRT. Which of
the following statement is true?

(A) Compression factor Z ＜ 1 when a/(RT) ＞ b.

(B) Compression factor Z ＜ 1 when a/(RT) ＜ b.

(C) Compression factor Z ＜ 1 when a/(RT²) ＜ b.

(D) Compression factor Z ＜ 1 when a ＜ b(RT).

(E) All of the above is incorrect.

10. Which of the following is "NOT" a correct aspect of the Born-Oppenheimer approximation (A) The electrons in a molecule move much faster than the nuclei. (B) Excited electronic states have the same equilibrium inter-nuclear distance as the ground electronic state. (C) The electronic and vibrational motions of a molecule are approximately (D) Electronic energy curves serve as potential energy functions for nuclear vibrational 3 motions. (E) The typical amplitude of nuclear vibration is much smaller than that characterizing the motion of electrons.

11. The benzene molecule C6H6 has how many vibrational modes (A) 6 (B)12 (C)24 (D)30 (E) 36 separable.

12. For the reaction A + B → product, the reaction rate is first order to A and first order to B. Integrate the rate law. [AJo and [B]o are the initial concentrations for A and B, respectively and [A]o is not equal to [B]o. t = time. (A) (B) (C) (D) (E) All of the above is incorrect. 

13. The normal boiling temperature of ethanol is 78.5℃ and its molar enthalpy change of vaporization at this temperature is 40.3 kJ/mol. Find AU when 3.000 mol of ethanol are vaporized at 78.5℃ at a constant pressure of 1.000 atm. Neglect the volume of the liquid compared with that of the vapor and assume the ethanol vapor as an ideal gas. (A) △U = 120.9 kJ (B) △U = 0.0 kJ (C) △U = -8.77 kJ (D) △U = 130.1 kJ (E) △U= 112.1 kJ

14. The ionization energy for hydrogen atom is 13.6 eV. The ionization Energy for the ground state of is approximately (A)13.6(B)27.2(C)40.8 (D)54.4 (E) 122.4 eV

15. Which of the following is NOT a correct consequence of the Heisenberg Uncertainty principle: (A) The shorter the lifetime of an excited state of an atom, the less accurately can its energy be measured. (B) An electron in an atom cannot be described by a well-defined orbit. (C) The momentum of an electron cannot be measured exactly. (D) Measurement of one variable in an atomic system can affect subsequent measurements of other variables. (E) A harmonic oscillator possesses a zero-point energy.

16. The Joule coefficient, u, is defined as . a is the thermal expansion coefficient. is the isothermal compressibility. Which of the following equation is correct? (A)(B) (C) (D) (E)

17. The orbital degeneracy (excluding spin) of hydrogen atom energy levels equals (A)n-1(B)n(C)n+1(D) 2n+1(E)n2

18. The change in enthalpy is given by dH = + Vdp. In combination with the Clapeyron equation, find out d(△H/T) and the two phases remain in equilibrium. (A) (B) d(△H/I) = Rd(In T) (C) d(△HIT) =△S d(In T) (D) (E) All of the above is incorrect

19. Which of the following statements about the hydrogen atom ground state is INCORRECT: (A) It is described by the quantum numbers n =1； 1 = 0； m = 0. (B) The electron's angular momentum equals plank constant, h. (C) The wave function is spherically symmetrical. (D) The wave function decreases exponentially as a function of r. (E) The radial distribution function has its maximum at the Bohr radius.

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