CH 4 : Covalent; KF: Ionic; CO: Covalent; SiCl 4 : Covalent; BaCl 2 : Ionic. (Reference: Chang 9.73) 9. Predict the geometries of the following species using the VSEPR method: (a) PCl 3 , (b) CHCl 3 , (c) SiH 4 , (d)TeCl 4 . (12 points) (a) 1 lp AX3E trigonal pyramidal. (b) 0 lp AX4 tetrahedral. 3 Copyright © 2014 by Thomas Edison State College. All rights reserved.
(c) 0 lp AX4 regular tetrahedral. (d) 1 lp AX4E seesaw structure. (Reference: Chang 10.7) 10. Predict the geometry of the following molecules using the VSEPR method: (a) HgBr 2 , (b) N 2 O, (c) SCN – (arrangement of atoms is SCN). (9 points) (a) Linear. (b) Linear. (c) Linear. (Reference: Chang 10.11) 11. Describe the geometry around each of the three central atoms in the CH3COOH molecule. 12. What is the relationship between the dipole moment and bond moment? How is it possible to have bond moments and yet be nonpolar? (3 points) 13. Specify which hybrid orbitals are used by carbon atoms in the following species: (a) CO, (b) CO 2 , (c) CN – . (6 points) (a) sp + p + p. (b) sp (c) sp + p + p. (Reference: Chang 10.37) 14. How many sigma bonds and pi bonds are there in each of the following molecules?
15. Which of the following species is not likely to have a tetrahedral shape? (a) SiBr 4 (b) NF 4 + , (c) SF 4 , (d) BeCl 4 –2 , (e) BF 4 – , (f) AlCl 4 – (6 points) SF 4 is not likely to have a tetrahedral shape. (Reference: Chang 10.71) 5 Copyright © 2014 by Thomas Edison State College. All rights reserved.
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