Name ________________________________

Inorganic Chemistry
Exam 2
March 4, 2003

(6 pts.) 1. Compare hexagonal and cubic close packing, describing the repeating pattern of the layers, the coordination number, and what holes are covered by the layers above and below any given layer.

(9 pts.) 2. Use the band theory to describe conductors, semiconductors, and insulators.

(3 pts.) 3. Describe why cesium chloride is not body centered cubic packing.

(6 pts.) 4. Describe Werner's Coordination Theory with regard to his primary and secondary valence and his inner sphere versus outer sphere.

(3 pts.) 5. The coordination numbers of spheres in body-centred cubic, simple cubic and cubic close-packed lattices are, respectively:

(a.) 8, 6, 12

(b.) 6, 8, 12

(c.) 6, 12, 8

(d.) 8, 12, 12

(4 pts.) 6. What is the effective atomic number for the following coordination compound.

K3[Co(CN)6]

(3 pts.) 7. Which statement is incorrect about water and ice?

(a.) Ice consists of a hydrogen-bonded molecular lattice.

(b.) The density of ice is greater than that of liquid water.

(c.) Water has a relatively high value of DHvap (373 K).

    1. Water is both a Brønsted acid and base.

(3 pts.) 8. In which of the following is the metal reduced? (These are not balanced equations).

(a.) [Fe(CN)6]4– à [Fe(CN)6]3–

(b.) [MnO4]1- à MnO2

(c.) [MnO4]2– à [MnO4]1-

(d.) [Cr2O7]2– à [CrO4]2–

 

(8 pts.) 9. Calculate Eo for ClO3-1 => Cl2.

1.201 1.18 1.7 1.63

ClO4- =====> ClO3- ====> HClO2 ===> HClO ====> Cl2

(3 pts.) 10. Why are zinc, cadmium, and mercury considered d-block metals but not transition metals?

(3 pts.) 11. Using at Figure 7.4 from Inorganic Chemistry.

Carbon will reduce FeO to Fe at:

(a.) 1500 K

(b.) 900 K

(c.) 700 K

(d.) 500 K

(6 pts.) 12. Using the standard reduction potentials provided, calculate the Eo for the following cell reaction:

(6 pts.) 13. Sketch all of the isomers of [CrCl2(H2O)4]+1.

(9 pts.) 14. Sketch all of the isomers of [CoCl2(en)2]+1. (Hint: en refers to the bidentate ligand ethylenediamine.)

(8 pts.) 15. Match the following coordination compounds with the proper type of isomerism:

(a.) Ionizational Isomerism ____ [PtCl2(NH3)2] and [Pt(NH3)4] [PtCl4]

(b.) Hydration Isomerism ____ [Cr(H2O)4Cl2]Cl*2H2O and [Cr(H2O)5Cl]Cl2*H2O

(c.) Linkage Isomerism ____ [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]

(d.) Polymerization Isomerism ____ [Co(NO2)(NH3)5]Cl2 and [Co(ONO)(NH3)5]Cl2

 

(4 pts.) 16. Give two advantges of LEDs over incandescent light bulbs.

(4 pts.) 17. Give 2 geometries for coordination number 4.

(5 pts.) 18. Describe the packing of the sodium and chloride ions in solid sodium chloride crystals.

(3 pts.) 19. Using the color wheel, if a solution absorbs in the yellow region of the spectrum, what color will it appear?

 

 

(4 pts.) 20. In coordination chemistry, the Lewis acid is the _______ and the Lewis base is the ________.