Chemistry 107 Sample Exam #2

1. Name the following compounds:

a. Fe(OH)₂

b. Na₂S

c. MgCO₃

d. NaHCO₃

e. FeBr₃

f. Cu(ClO₃)₂

g. AlPO₄

h. HgCl₂

i. KMnO₄

j. LiNO₂

2. For each box write the chemical formula formed by the cation at the head of the column and the anion at the left of the row:

Ions	K^+	Ca^+2	Co^+3
CrO4^2-
O^2-
PO3^3-
ClO^1-

3. Name each of the following as acids

a. HI

b. H₂S

c. H₂SO₄

d. H₂SO₃

e. HClO₃

f. HClO₄

g. HClO

4. Name each of the following species:

a. N₂O₄

b. SO₂

c. OF₂

d. P₂O₅

e. NH₃

f. IO₃^1- (careful!!)

5. Write a formula for each of the following:

a. boron trifluoride

b. nickel (III) chloride

c. sodium nitride

d. aluminum sulfate

e. nitric acid

f. Copper (II) carbonate

6. Write the formulas expected for an ionic compound formed from the two elements in each of the following:

a. Aluminum and sulfur

b. Barium and Iodine

c. Cesium and fluorine

7. Determine the positive charge on the metal from the expected negative charge on the nonmetal for each of the following:

a. Fe₂S₃

b. CrCl₃

c. Cu₂O

8. Balance the following chemical equations:

            a.    P    +   Br₂ ®         PBr₃

            b.    Ag₂SO₄       +       NaI                  ®            AgI         +     Na₂SO₄

            c.    Cd     +     HCl                 ®                 CdCl₂                 +             H₂

            d.    NaClO₃ ®            NaCl           +        O₂

9.  Classify each of the above reactions as synthesis, decomposition, single displacement, double displacement:

            a.

            b.

            c.

            d.

10.  Write balanced equations for the following reactions:

            a. The combustion of liquid butane (C₄H₁₀) to produce gaseous carbon dioxide and gaseous water.

            b. The decomposition of aqueous sulfurous acid to produce liquid water and gaseous sulfur dioxide

            c. The combination of solid phosphorus (P₄) and  fluorine gas to produce phosphorus pentafluoride

            d. The decomposition of copper(I) oxide into its elements by heating

            e. The decomposition of antimony pentafluoride into elemental fluorine and antimony trifluoride.

11.. Decide whether a precipitate will form when silver nitrate and lithium carbonate solutions are mixed. If a precipitate forms, write a net ionic equation for the reaction.

12. Calculate :

a. the number of atoms of oxygen in 4.0 grams of O₂

b. the mass of one atom of magnesium

c. moles of Al(OH)₃ contained in 400 mg of this substance

13.  A compound contains 54.3 % C, 5.6% H and 40.1 % Cl.  Calculate the empirical formula for this compound Calculate the percent composition of each element in the compound Ag₂CO₃

14. Calculate the percent composition of each element in the compound Ag₂CO₃