Arkansas State University 
Department of Chemistry
and Physics
CHEM2004
Exam 5

CHEM2004                                                               Name_______________________

Exam 5                                                                      Fall 2009

 

1. Balance the following redox equation:      SHOW WORK          (10 points)

 

 Mn+2  (aq)    +       BiO3 - (aq)  g    Bi+3  (aq)    +      MnO4 - (aq)            (acidic solution)

 

2.         Write the Nernst equation for the balanced reaction in problem 1: Is the cell potential pH dependent?  (6 points)

 

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

 

4.         List two very electronegative nonmetals. (4 points)

 

5.         In class, the activity of the metals were categorized by their electronegativities.  Give the three classes.          (3 points)

 

6.         Match the class of silicate with each of the following substances. (1 point each – 15 points total)

 

_____ micas                                         

A. simple silicate

_____ amphibole  

 

_____ asbestos 

B.  linear silicate
_____  pyroxene  

_____ biotite

C.  cyclic silicate

_____ garnet

 

_____ tremolite

D.  chain silicate
_____ vermiculite  
_____ montmorillonite E.  polymeric sheet silicate
_____ agate  
_____ quartz F.  three dimensional silicate
_____ beryl  
_____ thortveitite  
_____ onyx  
_____ metasilicates  

 

7.         Describe how glass is made.  Use the terms acidic oxide and basic oxide in your answer.  (8 points)

 

8.         Draw the structure of a pyroxene showing four units.    (3 points)

  

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

 

_____ biological stain  a)  B2O3
_____ Portland cement b)  Na2B4O7
_____ Borax   c)  ClO2
_____ color TV tubes  d)  [AlxSiyO2x+2y]x-
_____ used as bleach e)  Al6O1818-
_____ Heteropoly Blues f)  Na5P3O10
_____ pyrex g)  [X+nM12O40](8-n)-
_____ fine crystal h) SrO
_____ zeolites i)  V10O286-
_____ polyvanadate k)  PbO
  m)  La2O3
  o) Mo7O246-
  p) OsO4
   

      

10.       For each of the following pairs, circle the compound that is easiest to reduce.  (2 points each)

 

a)         NO3-  or H3PO4

 

b)        GeO2  or  Ga+3

 

c)         MnO4-  or  ReO4-

 

11.       Fill in the blank. (2 points each)

 

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

 _________________________________

 

b) For a spontaneous process the sign of Eo is  ___________________

 

c) High melting solids with a low volatility _______________________________

 

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

 

e) Solids without a regular crystalline pattern are said to be ________________________

 

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

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

 

h) Oxides that are not formed from acidic oxides and do not have identifiable oxo anions (ex. BaTiO3) __________________________________

 

12.       State the First Principle of Isomorphous Substitution and give an example. (6 points)