CHM 2045C Chapter 5 Kotz5e

Sample Multiple Choice Answers

 

1. The correct answer is:
    c.
PbSO4

Explanation:
Students should know some solubility rules. All ammonium salts and alkali metal salts are soluble.

Solution Reference:
Page 186, Precipitation Reactions

 

2. The correct answer is:
   e.
Hg2Cl2.

Explanation:
All common chlorides are soluble except AgCl, PbCl2, and Hg2Cl2.

Solution Reference:
Page 186, Precipitation Reactions

 

3. The correct answer is:
    c.
(NH4)2S.

Explanation:
All ammonium salts are soluble.

Solution Reference:
Page 186, Precipitation Reactions

 

4. The correct answer is:
    c.
AgNO3 and CsBr.

Explanation:
To have success on these questions, a student needs to know the simple solubility rules. Only silver bromide, in response c, is insoluble.

Solution Reference:
Page 186, Precipitation Reactions

 

5. The correct answer is:
    d.
the ion, K+
, could be a spectator ion.

Explanation:
The equation indicates that benzoic acid has been neutralized by a strong base so the base could be NaOH, KOH, or ....

Solution Reference:
Page 189, Net Ionic Equations


6. The correct answer is:
    c.
H+(aq) + OH-(aq) --> H2O(l)

Explanation:
Hydrobromic acid is a strong acid and potassium hydroxide is a strong base.

H+(aq) + Br-(aq) + K+(aq) + OH-(aq) --> H2O(l) + K+(aq) + Br-(aq)

Therefore, K+ and Br- are spectator ions.

Solution Reference:
Page 189, Net Ionic Equations and Page 192, Acids and Bases


7. The correct answer is:
    e.
H3PO4 and HClO.

Explanation:
Both H3PO4 and H3PO3 are weak acids.

Solution Reference:
Page 192, Acids and Bases


8. The correct answer is:
     a.
H2S

Explanation:
Strong acids are strong electrolytes and weak acids are weak electrolytes.

Solution Reference:
Page 192, Acids and Bases



9. The correct answer is:
    b.
SO3 and H2SO4

Explanation:
SO3 + H2O --> H2SO4
The oxidation number of the central atom in the acidic oxide has to be the same as that in the acid. Sulfur above has a +6 oxidation state in both SO3 and H2SO4.


Solution Reference:
Page 195, Oxides of Nonmetals and Metals, and Page 206, Oxidation Numbers

 

10. The correct answer is:
      c.
will hydrolyze and produce hydroxide ions.

Explanation:
Acidic solutes can react with water (hydrolysis) and produce hydronium ions.

Solution Reference:
Page 192, Acids and Bases

 

11. The correct answer is:
      c.
2H+(aq) + 2NaI(s) + H2SO4(aq) --> I2(s) + 2H2O + SO2(g) + 2Na+

Explanation:
H2SO4 has oxidized I- to I2 while it has been reduced to SO2.

Solution Reference:
Page 204, Oxidation-Reduction Reactions

 

 

12. The correct answer is:
c.
P4.

Explanation:
Phosphorus is both the oxidizing agent and the reducing agent. Phosphorus has undergone a disproportionation reaction.

Solution Reference:
Page 205, Redox Reactions and Electron Transfer

13. The correct answer is:
     d.
3.

Explanation:
Hydrogen bonded to nonmetals has an oxidation number of +1.
3(+1) + y + 3(-2) = 0


Solution Reference:
Page 206, Oxidation Numbers

 

 

14. The correct answer is:
      c.
3.

Explanation:
NO2- ; Y + 2 (-2) = -1

Solution Reference:
Page 206, Oxidation Numbers

 

 

15. The correct answer is:
1 only.

Explanation:
Reaction 1 is an oxidation-reduction reaction.
Reaction 2 is an acid-base reaction because there is a proton transfer.
Reaction 3 is a precipitation reaction.


Solution Reference:
Page 201, Organizing Reactions in Aqueous Solution

16. The correct answer is:
b.
the number of moles of solute per liter of solution.

Solution Reference:
Page 213, Solution Concentration: Molarity

17. The correct answer is:    

 b. 5.79

Explanation:

Solution Reference:
Page 213, Solution Concentration: Molarity


18. The correct answer is:
      a.
5.61 g

Explanation:


Solution Reference:
Page 213, Solution Concentration: Molarity


19. The correct answer is:
     c.
0.006 mol

Explanation:


Solution Reference:
Page 213, Measuring Concentrations



 

20. The correct answer is:
     b.
0.364 L

Explanation:


Solution Reference:
Page 213, Solution Concentration: Molarity

 

21. The correct answer is:
      c.
I2(aq) + H2O(l) --> HOI(aq) + HI(aq)

Explanation:
Only iodine has a change in oxidation number.

Solution Reference:
Page 201, Organizing Reactions in Aqueous Solution

 

22. The correct answer is:
      e.
200.0 mL

Explanation:


Solution Reference:
Page 222, Titrations


23. The correct answer is:
     d.
567

Explanation:


Solution Reference:
Page 222, Titrations


24. The correct answer is:
      a.
25.0 ml

Explanation:


Solution Reference:
Page 217, Diluting a More Concentrated Solution


25. The correct answer is:
     b.
2.09

Explanation:


Solution Reference:
Page 222, Titrations