Arkansas State University  Department of Chemistry and Physics
CHEM2004	Exam 3

CHEM2004                                                                                                               Name_______________________

Exam 3                                                                                                                       Fall 2006 

1.         Show a) the reaction of perchloric acid in water and b) the reaction of nitric acid in water.   How do these reactions explain the leveling effect?  (10 points)

a)

b)

2.         Describe the effect on pH of each of the following when placed in water:   (6 points)

a)  Na₂O -

b)  SO₃ -

c) RuO₄ -

3.         Fill in the blank with the appropriate oxide or oxoacid. (1 point each)

Syn-gas   ________________________________________

Photosynthesis  __________________________________

Used as fire extinguisher  ___________________________

Number one chemical produced in tons per year  _________________________

Oxide used as a drying agent  _________________________________

Oxoacid used to make ammonium nitrate __________________________

Oxide used to make phosphoric acid  _________________________________

Used to make carbonated beverages ___________________________

4.         Predict the product(s) for the following reaction:  Label the acidic oxide, the basic oxide and balance the equation.                               (12 points)

CO₂      +      MoO₃   g 

P₂O₅         +      CoO      g

Cr₂O₃         +      H₂O      g

BaO          +      CO₂     g

5.         Determine the C.N.(+), C.N.(-), the lattice and expected properties for:   (12 points) 

 Mn 78; F 119; O 126; Cu 91; K 152 pm

6.         Describe the role of CO₂ in the Greenhouse effect.              (4 points) 

7.         Why should you be careful when using P₄O₁₀ as a drying agent for organic solvents? (4 points)

8.       List the environmental problems associated with NO_x’s.    (9 points)

9.         Describe how phosphoric acid is prepared from elemental phosphorus.  (6 points)

10.       Describe how sulfuric acid is prepared starting from sulfide ores.          (6 points)

11.       Why do oxides of metals at the right of the period generally have lower melting points than those to the left of the period?   (6 points)

12.   Why is it difficult to make pure strong oxoacids?   (4 points)

13.       List three common uses for sulfuric acid .      (6 points)

14.       How is forsterite made? What is it used for?              (7 points)