Arkansas State University  Department of Chemistry and Physics
CHEM2004	Exam 6

CHEM2004                                                               Name _________________________

Exam 6                                                                       Fall 2006

1.         Based on the flow charts, match the reagent/ test first used to identify the ion listed below:   (20 points)

a. chloride             b. sulfide                     c. hydroxide                   d. carbonate                   e. flame test

_____ zinc                                                                                        _____ cobalt

_____ mercury(I)                                                                               _____ iron

_____ sodium                                                                                   _____ magnesium

_____ chromium                                                                               _____ lead(II)

_____ antimony                                                                                _____ barium

2. Give the color for each of the following:                                      (24 points)

ZnS

Hg₂Cl₂

CuS

CaCO₃

SnS₂

PbCl₂

Ni(OH)₂

PbCrO₄

HgS

Sb₂S₃

CdS

Cr(OH)₃

3.         List the group VI cations:                  (6 points)

4.          List the ions that give insoluble sulfides.                (6 points)

5.         Give the color of the flame for each ion below:      (5 points)

Barium

Copper

Strontium

Potassium

Sodium

6.         List the steps needed to go from the opening screen on Virtual ChemLab to show the reaction of Pb ^{+ 2} with Na₂SO ₄, ending with the discarding of the mixture. (12 points)

7.         Give the net ionic equation for each of the following:    (15 points)

PbCl_{2 (s)}

BaSO_{4 (s)}

Cr(OH)_{3 (s)}

Ag₂CO_{3 (s)}

Co₃(PO₄)_{2 (s)}

8.         Describe how to calculate/ approximate the pH for each of the following: (14 points)

0.01 M HCl

0.2 M NaOH

0.4 M FeSO₄

0.33 M NaCl