22. The molecules below are:
  
(A) constitutional isomers
(B) enantiomers
(C) diastereomers
(D) identical
(E) none of above

23. Which of the following is a correct description of "catalyst?" (A) It stabilizes the product. (B) It lowers the reaction enthalpy. (C) There is no reaction between the catalyst and the reactants. (D) It decreases the activation energy. (E) It diminishes the energy gap between the starting materials and the products.

24. What is the point group of sulfuric acid (with the highest possible symmetry)? (A)Td (B)C4 (C) D2d (D)C2v (E) Cs

25. Rank the following compounds from the most soluble to the least soluble in water.(A)1＞2＞3＞4(B)2＞4＞1＞3(C)2＞1＞4＞3(D)3＞4＞1＞2(E)4＞2＞1＞3

26. There are three types of cubic unit cells, including simple cubic (SC), face-centered cubic (FCC), and body-centered cubic (BCC). Which of the following statements is correct? (A) BCC has 4 atoms per unit cell. (B) FCC has the largest unit cell. (C) The coordination number of SC is 8. (D) FCC is alternatively called hexagonal close-packed structure. (E) In BCC, the atomic packing factor is 0.68.

27. How many aromatic hydrocarbons have the molecular formula of C8H10? (A)2 (B)3 (C)4 (D)5 (E)6

28. Which of the following statements about mass spectrometry is correct? Ⅰ.The ions are separated based on their charge-to-mass ratio. Ⅱ.Chemical ionization produces more fragmentation than electron ionization. Ⅲ. Mass spectrometry can be used to accurately measure small differences in isotopic abundance. (A) I and II only (B) I and III only (C) II and IiI only (D) III only (E) I only

29.Which of the following statements associated with collision theory is incorrect? (A) More collisions correspond to a faster reaction rate. (B) It is assumed that the reactant molecules are hard spheres. (C) The potential energy and orientation govern the occurrence of collisions between reacting particles. (D) Collisions can oceur between atoms, ions, and molecules. (E) The Arrhenius equation gives the correlation between the rate constant k and temperature T.

30. The jonization energy of H is 13.6 eV. The first and second ionization energies of He will be approximately (A) 5 eV and 14 eV (B) 5 eV and 54 eV (C) 14 eV and 24 eV (D) 14 eV and 34 eV (E) 24 eV and 54 eV

31. Two bodies, A and B, collide as shown in Figures I and II below. Which statement is true?(A) They exert equal and opposite forces on each other in both I and II. (B) They exert equal and opposite forces on each other in II but not in I. (C) They exert equal and opposite forces on each other in I but not in II. (D) The forces are equal and opposite to each other in I, but only the components of the forces parallel to the velocities are equal in II. (E) The forces are equal and opposite in I, but only the components of the forces perpendicular to the velocities are equal in II.

32.Two identical balls strike normal to a wall with the same velocity respectively. Ball A bounces backwards at the same speed. Ball B stops. Which statement correctly describes the change in momentum of the two balls? (A) |△pB|＞|△pAl (B) |△pB=|△pA|(C) |△pBI ＜I△pAl (D) △pB=△pA (E) △pB＞△pA

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