Name ___________________________

Inorganic Chemistry

Exam 3

April 10, 1997

 

All work must be shown for any credit to be given.

(5 pts.) 1. What is the great departure in terms of acid-base definitions in the Lewis theory compared to those of Arrhenius-Ostwald and Brr nsted-Lowry?

 

 

 

 

 

 

 

 

(6 pts.) 2. Using the Nernst equation, calculate the emf value for the following cell.

Pt, H2 / H+ (a = 0.1) // H+ ( a = 10-7) / H2, Pt

 

 

 

 

 

 

 

 

 

 

 

 

 

(6 pts.) 3. Name the following compounds according to the IUPAC rules:
    1. [CrCl(NH3)5] Cl2

      2.  

       

    2. K3[Co(CN)6]

 

 

 

(10 pts.) 4. Determine the number of unpaired electrons and the LFSE for each of the following:
    1. [Fe(CN)6]-4 (CN- ion is a strong field ligand)

      2.  

       

       

       

       

       

       

       

       

    2. [CrCl6]-3 (Cl- ion is a weak field ligand)

 

 

 

 

 

 

 

 

(3 pts.) 5. Why are low-spin complexes usually not encountered for tetrahedral coordination?

 

 

 

 

 

(8 pts.) 6. Give examples of the following types of isomerism:
    1. ionization isomerism

      2.  

       

       

    2. geometric isomerism

 

 

 

 

(6 pts.) 7. Give both coordination and chain theory structures for Co(NH3)5Cl3.

 

 

 

 

 

 

 

 

 

(4 pts.) 8. Predict the number of ionizable groups for each theory for the molecule Co(NH3)3(NO2)3.

Coordination Theory Chain Theory

 

 

 

 

 

 

 

 

(4 pts.) 9. Relate the significance of the Lewis acid-base theory to the coordination theory.

 

 

 

 

 

(4 pts.) 10. Using the Nernst equation, explain why the voltage of a battery decreases.

 

 

 

 

 

 

 

 

 

 

(4 pts.) 11., Explain why, for the d4, d5, d6, and d7 cases, there are both strong field (low-spin, spin-paired) and weak field (high-spin) cases in an octahedral field.

 

 

 

 

 

 

(4 pts.) 12. Describe the Jahn-Teller Theorem.

 

 

 

 

 

 

(8 pts.) 13. Specify whether the following is acidic (A) or basic (B):
    1. Na2O ______________
    2. SO3 ______________
    3. Cl2O7 ______________
    4. CaO ______________

 

(4 pts.) 14. Describe the two types of valence used in Werner’s coordination theory.

 

 

 

 

 

(6 pts.) 15. Calculate the Effective Atomic Number (EAN) for cobalt in [Co(NH3)5Cl]Cl2.

 

 

 

 

 

 

 

(4 pts.) 16. What type of hybridization is used in the Valence Bond Theory for:
    1. octahedral coordination ___________
    2. tetrahedral coordination ___________

(4 pts.) 17. Name the two geometries that are possible for coordination number 4.

 

 

 

 

(6 pts.) 18. Name the three geometries that are possible for coordination number 5.

 

 

 

 

 

 

(4 pts.) 19. Name the geometry that is possible for:
    1. coordination 2 __________________
    2. coordination 3 __________________

 

(5 bonus pts.) 20. Give the designations for the 5 "d" orbitals.