Arkansas State University Department of Chemistry and Physics

Note: Only the questions have been listed to save space.  The point total adds to over 100 points.  This exam shows example problems that may be seen on the exam.  The exam will be 100 points total excluding bonus, if any.

1. Complete the equilibrium and write the Ksp expression for each of the following: (8 points)
 

a) PbCl 2 (s)
b) FeS (s)

2. Determine the molar solubility of CuS. K _sp = 6.0 x 10 ^{- 3 7} (6 points)

3. Determine the K _sp for PbI ₂ if the molar solubility is 1.52 x 10 ^{- 3} M. (6 points)

4. Calculate the solubility (g/L) of AgI in 0.24 M AgNO₃. K _sp = 8.3 x 10 ^{- 1 7} (8 points)

5. Tell if the following compounds are soluble (S) or insoluble (I) (6 points)
 

Fe(OH) 3 _______	CoClO 3 _______
Li2S _______	(NH 4) 2CrO 4 _______
NaI _______	BaSO 4________

6. Balance the following redox reaction: (8 points)

7. In a Galvanic Cell:

a) What is the salt bridge for?

b) At which electrode does the oxidation occur? _____________

c) For a spontaneous reaction, what is the sign (+ or -) for the cell potential? ________________ (6 points)

8. Write the cell diagram for the Cu⁺²/Cu and Cr⁺³/Cr half-cells and calculate the E ^o for the Cu⁺²/Cu and Cr⁺³/Cr half-cells. (16 points)

9. Determine the E for the Co⁺²/Co and Pb⁺²/Pb half-cells if the [Co⁺²] = 2.0 M and the [Pb⁺²] = 0. 50 M. (12 points)

10. Determine the DG^o for the Co⁺²/Co and Pb⁺²/Pb half-cells. (8 points)

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

a ) combination of an alcohol and an organic acid___________________

b) class of sweet-smelling organic compounds _______________

c) class of compounds which includes the compound which gives bananas their distinctive odor ____________________

d) vinegar belongs to which class of compounds _________________

e) glycine belongs to which class of compounds _________________

f) compounds which contain only carbon and hydrogen _____________________

g) formula for methane ___________________

h) acetone belongs to which class of compounds ______________________

i) organic chemistry is the chemistry of which element _________________

j) formaldehyde is used as a ___________________________

k) gasoline belongs to which class of compounds _____________________

l) used as a refridgerant, destroys the ozone layer _____________________

m) common name for isopropyl alcohol ___________________________

n) class of compounds commonly used as fuels ___________________________

12.  Identify the class of organic compounds that best fits the structures shown below.  Place the answer on the line below the compound.   (3 points each)
 
 

	Hint:  Netscape users: Right click on the image for the answer (after view image - the compound type is the name of the file, i.e. the image name for compound g is ester.jpg.  Compound g is an ester). IE users: Right click on the image and do save as.  The file name is the answer.