Chem 1151Quiz 4A(green)March 4, 200815 points

Name______Key______Sec______

1.(3)Identify the insoluble salts

  1. BaSO4IV.Pb(NO3)2
  2. AgBr V.(NH4)2S
  3. K3PO4
  1. **I, II
  2. II, III
  3. I, III, V
  4. I, II, IV
  5. II, III, V

2(3)The correct net ionic equation for the reaction

Li2S (aq) + CuCl2(aq) 

  1. 2Cu+(aq) + S2-(aq)  Cu2S(s)
  2. Li+(aq) + Cl-(aq)  LiCl(s)
  3. 2Li+(aq) + S2-(aq)  Li2S(s)
  4. **Cu2+(aq) + S2-(aq)  CuS(s)
  5. NR

3.(2)Manganese is a stronger reducing agent than nickel. Will this reaction occur?

Mn(s) + Ni2+(aq)  Mn2+(aq) + Ni(s)Yes (Mn will reduce Ni2+)

4.(7)Consider the reaction IO3- + HSO3-  I- + SO42-

+5, -2 +1, +4, -2-1+6, -2

a.(3)Assign all oxidation numbers to the atoms in this reaction.

b.(2)The atom __S_is oxidized and the species ___IO3- __is the oxidizing agent.

c.(2)Write and balance the reduction ½ reaction. (check).

IO3- + 6H+ + 6e-  I- + 3H2O

.

d.(2)Write and balance the oxidation ½ reaction (check)

HSO3- + H2O  SO42- + 3H+ + 2e-

Chem 1151Quiz 4B(blue)March 4, 200815 points

Name____Key______Sec______

1.(3)Identify the insoluble salts

I.Pb(NO3)2IV.(NH4)2S

II. AgBrV.K3PO4

III.BaSO4

  1. I, II
  2. **II, III
  3. I, III, V
  4. I, II, IV
  5. II, III, V

2(3)The correct net ionic equation for the reaction

Li2S (aq) + CuCl2(aq) 

  1. 2Cu+(aq) + S2-(aq)  Cu2S(s)
  2. Li+(aq) + Cl-(aq)  LiCl(s)
  3. **Cu2+(aq) + S2-(aq)  CuS(s)
  4. 2Li+(aq) + S2-(aq)  Li2S(s)
  5. NR

3.(2)Calcium is a stronger reducing agent than zinc. Will this reaction occur?

Ca(s) + Zn2+(aq)  Ca2+(aq) + Zn(s)Yes (Ca will reduce Zn2+)

4.(7)Consider the reaction BiO3- + Mn2+  Bi3+ + MnO4-

+5, -2+2+3-7, -2

a.(3)Assign all oxidation numbers to the atoms in this reaction.

b.(2)The atom _Bi__is reduced and the species __Mn2+ __is the reducing agent.

c.(2)Write and balance the oxidation ½ reaction. (check)

4H2O + Mn2+  5e- + 8H+ + MnO4-

d.(2)Write and balance the reduction ½ reaction (check)

BiO3- + 6H+ + 2e-  Bi3+ + 3H2O