12. What is the probability of finding a particle in a one-dimensional box in energy level n = 4 between x = L/4 and x = L/2? (L is the length of the box.)
(A)50%
(B) 12.5%
(C) 33%
(D)25%
(E) 37.5%

13. According to the VSEPR model, the electron pairs around NH3 and those around CH4 are arranged (A)differently, because in each case there are a different number of atoms around the central atom. (B) the same, because both nitrogen and carbon are in the second period. (C) differently, because in each case there are a different number of electron pairs around the central atom. (D)differently or the same, depending on the conditions leading to maximum repulsion. (E) the same, because in each case there are the same number of electron pairs around the central atom.

14. Which statement about the thiocyanate ion, SCN-, is true? (A)Only one correct resonance structure can be drawn. (B) Its Lewis structure contains an unpaired electron. (C) Its shape is bent like that of H2O. (D)There are more than two σ bonds in the ion. (E) none of these

15. Initial rate data have been determined at a certain temperature for the gaseous reaction2NO + 2H2 → N2 + 2H2O What is the numerical value of the rate constant? (A)1.5 (B) 9.9 (C) 3.0 (D)0.13 (E) 0.44

16. The reaction A → B + C is known to be zero order in A with a rate constant of 5.0 × 10-2 mol/L • s at 25° C. An experiment was run at 25°C where [A]0 = 1.0 × 10-3 M. What is the integrated rate law? (A)[A] = kt (B) [A]0 - [A]= kt (C) [A] – [A]0 = kt (D)(E)

17. A p-type semiconductor (A)is made by doping host atoms with atoms having more valence electrons than the host. (B) has electrons that lie close in energy to the conduction bands. (C) is made by doping host atoms with atoms having fewer valence electrons than the host (D)two of these (E) none of these

18. A liquid-liquid solution is called an ideal solution ifI. it obeys PV = nRT； II. it obeys Raoult's law.III. solute-solute, solvent-solvent, and solute-solvent interactions are very similar.IV. solute-solute, solvent-solvent, and solute-solvent interactions are quite different. (A)II, IV (B) II, III (C) I, II (D)I, II, III (E) I, II, IV

19. What reason is given for the stability of C□O, N□N, and O□O bonds, compared to the instability of Si□Si, P□P, and S□S bonds? (A)Their metallic character varies greatly. (B) There are large differences in their abilities to form strong pi bonds. (C) There are large differences in their ionization energies. (D)There are large differences in their electronegativities. (E) none of these

20. Which of the following is diamagnetic? (A)F2+ (B) C2+ (C) H2+ (D)N2+ (E) N2+

21. The U-238 nucleus decays to form Pb-206 by α and β decays. Calculate the number of α decays. (A)2 (B)4 (C) 6 (D)8 (E) none of these

22. In lecture, the professor named a molecule 2-ethyl-4-tertiary-butylpentane. An alert student pointed out that although the correct structure could be drawn from this name, the name did not follow systematic rules. What is the correct systematic name for the molecule? (A)3,5,6,6-tetramethylheptane (B) 2-ethyl-4,5,5-trimethylhexane (C) undecane (D)2,2,3,5-tetramethylheptane (E) 2-t-butyl-5-methylhexane

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