Arkansas State University  Department of Chemistry and Physics
CHEM2004	Exam 4

CHEM2004                                                               Name_______________________
Exam 4                                                                       Fall 2003

1. Fill in the blank. (1 points each)

a) Problem in the lattice when atoms are missing from the structure is called a
 _________________________________

b) Name of the effect that causes current to flow when a pressure is applied
____________________________

c) Oxides that do not have a whole number ratio of metal to oxygen are _____________________________________________

d) Process of mixing powders and heating to high temperatures, allowing the powders to slowly fuse into each others’ lattices is called ____________________________

e) High melting solids with a low volatility are called ______________________________
 

2. Match the class of silicate with each of the following substances. (2 points each)
 

_____ biotite                                         A. simple silicate

_____ amphiboles                                 B.  linear silicate

_____ benitoite                                     C.  cyclic silicate

_____ beryl                                          D.  chain silicate

_____ agate                                         E.  polymeric sheet silicate

_____ olivine                                        F.  three dimensional silicate

_____ thortveitite

_____ micas

_____ vermiculite

_____ onyx
 

3. Give the oxide or oxoanion that best fits or describes each of the following:  (1 point each)

used to make fine crystal glass  ___________________________

used as a detergent, mined in Death Valley ______________________________

pyrex glass _________________________________

used as bleach when diluted with carbon dioxide ______________________

absorbs x-rays from color TV tubes  ________________________________

4. Glass is made by combining silica, sodium carbonate and limestone.  How does this relate to acidic and basic oxides?  ( 5 points)

5. State the first and second principles of isomorphous substitution and give and example for each.   (10 points)

6. Write the Nernst equation for the following reactions and tell if the cell potential is pH dependant:  (15 points)

a)   S₂O₃^2- (aq)   --------->      S₄O₆^2- (aq)         E^o = X Volts

b)   Bi(OH)₃ (aq)   --------->      Bi (s)         E^o = Y Volts

c)   I^- (aq)   --------->      I₂ (aq)          E^o = Z Volts

7. List the 5 potentially hazardous combinations and give an example for each.              (15 points)

8. Why can you not reduce the ions of very electropositive metals in water? (4 points)

9. What are zeolites and what are they used for?   (4 points)

10. In class, the activity of the metals were categorized by their electronegativities.  Give the three classes and describe how each of these react with H₂O. (6 points)

11. What are heteropoly blues (and it is not a country song title)? What is the Keggin structure (and it is not something to hold the Keggin)?  (4 points)

12. Polynuclear phosphates are important in both industry and biochemically.  Give an example for each. (4 points)

14. Draw the structure of a pyroxene.    (3 points)