Name: 
 

Practice Final B


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
For bromine, mc001-1.jpgH° vap = 30.91 kJ/mol and mc001-2.jpgS° vap = 93.23 J/Kmol.   What is the normal boiling point for bromine?
A)
332°C
B)
124°C
C)
25°C
D)
58°C
 

 2. 
The formation constant (Kf) for the reaction shown below is 1.7x107 at 25 °C.  What is mc002-1.jpgG° at this temperature?

mc002-2.jpg
A)
–41.2 kJ
B)
–17.9 kJ
C)
–1.5 kJ
D)
–3.5 kJ
 

 3. 
For a particular process mc003-1.jpgG is less than mc003-2.jpgH.  Therefore
A)
mc003-10.jpgS is zero
B)
mc003-11.jpgS is positive
C)
mc003-12.jpgS is negative
D)
mc003-13.jpgS is positive if mc003-14.jpgH is negative and mc003-15.jpgS is negative if mc003-16.jpgH is positive
 

 4. 
Elemental boron can be formed by the reaction of boron trichloride and hydrogen, as shown below.  If mc004-1.jpgS° for this reaction is 80.3 J/K, what is S° for BCl3(g)?

 
BCl3(g)        +       1.5 H2(g)    mc004-2.jpg         B(s)         +   3 HCl(g)
S° (J/Kmol)
???
130.6
5.87
186.8
A)
18.2 J/Kmol
B)
290.1 J/Kmol
C)
450.6 J/Kmol
D)
–18.2 J/Kmol
 

 5. 
Doubling all the coefficients in the equation for a cell reaction
A)
does not change E° or mc005-3.jpgG°
B)
doubles both E° and mc005-4.jpgG°
C)
doubles E°, but does not change mc005-5.jpgG°
D)
doubles mc005-6.jpgG°, but does not change E°
 

 6. 
Calculate mc006-1.jpgG° for a cell that utilizes oxidation of copper by nitric acid at 25 °C.

                             Cu2+(aq) + 2 e–  mc006-2.jpg  Cu(s)                              E° = 0.34 V
               NO3–(aq) + 4 H+(aq) + 3 e– mc006-3.jpg NO(g) + 2 H2O(l)         E° = 0.96 V
A)
–360 kJ
B)
–120 kJ
C)
–240 kJ
D)
–180 kJ
 

 7. 
Which of the following substances is the strongest oxidizing agent?

mc007-1.jpg
A)
Cr2+
B)
Co2+
C)
Fe2+
D)
Sr2+
 

 8. 
Predict the sign of mc008-1.jpgS° for the following reaction:

K2SO4 (s)  mc008-2.jpg  2 K+ (aq) + SO42– (aq)
A)
mc008-3.jpgS° > 0
B)
mc008-4.jpgS° = 0
C)
 mc008-5.jpgS° < 0
D)
More information is needed to make a reasonable prediction
 

 9. 
Which of the following substances will reduce Ag+ but not Cu2+?
A)
Br2
B)
Sn2+
C)
Fe3+
D)
I2
 

 10. 
Which of the following substances is the strongest reducing agent?

mc010-1.jpg
A)
Pb(s)
B)
Pt(s)
C)
Br–(aq)
D)
Ca(s)
 

 11. 
In an electrochemical cell, Q= 0.0010 and K=0.10.  Which statement below is true?
A)
Ecell is negative and E°cell is positive
B)
Ecell is positive and E°cell is negative
C)
Both Ecell and E°cell are positive
D)
Both Ecell and E°cell are negative
 

 12. 
A redox reaction employed in an elelctrochemical cell has a negative DG°rxn.  Which statement is true?
A)
E°cell is positive; K <1
B)
E°cell is negative; K <1
C)
E°cell is positive; K >1
D)
E°cell is negative; K >1
 



 
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