12. Place the following in order of decreasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule.

(A)
(B)
(C)
(D)
(E)

8. Choose the valence orbital diagram that represents the Si. (A)(B) (C)(D) (E)

9. Predict the charge for the most stable ion of nitrogen(A) -3(B)-2 (C) 1 (D) 0 (E) +3

複選題10. Choose the compound below that should have the highest melting point according to the ionic bonding model. (A) Srl2 (B) MgF2 (C) CaCl2 (D) SrF2 (E) SrBr2

11. Draw the Lewis structure for including any valid resonance structures. Which of the following statements is TRUE? (A) The nitrite ion contains one N-O single bond and one N=O double bond. (B) The nitrite ion contains two N-O bonds that are equivalent to 1.5 bonds. (C) The nitrite ion contains two N=Odouble bonds. (D) The nitrite ion contains two N-O single bonds. (E) None of the above are true.

13. Draw the Lewis structure for . What is the hybridization on the Br atom? (A) sp3d2 (B) sp3d (C) sp3 (D) sp2 (E) sp

14. Using the VSEPR model, the molecular geometry of the central atom in SO2 is ________ (A) linear (B) trigonal planar (C) tetrahedral (D) bent (E) trigonal pyramidal

複選題15. Place the following substances in order of increasing vapor pressure at a given temperature.  NF3 NH3 BCl3 (A) NH3＜NF3＜BCl3 (B) NF3＜NH3＜BCl3 (C) BCl3＜NF3＜NH3 (D) NH3＜BCl3＜NF3 (E) BCl3＜NH3＜NF3

16. Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions? (A) H2 (B) HI (C) CO2 (D) CH3NH2 (E) CH3OH

17. Which of the following statements is TRUE? (A) The solubility of a solid is not dependent on either temperature or pressure. (B) The solubility of a solid is highly dependent on pressure. (C) The solubility of a solid is highly dependent on both pressure and temperature. (D) The solubility of a solid is highly dependent on temperature. (E) None of the above.

18. Consider the following reaction at equilibrium. What will happen if we add more SO3 in the system? SO2(g)+NO2(g)⇌ SO3(g)+NO(g) (A) The reaction will shift in the direction of products. (B) The reaction will shift to decrease the pressure. (C) No change will occur since SO3 is not included in the equilibrium expression. (D) The reaction will shift in the direction of reactants. (E) The equilibrium constant will decrease.