Name: 
 

Practice Test 2B



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

 1. 

A 3.00-mol sample of each reactant will produce what volume of N2O at STP, as shown below:
mc001-1.jpg
A)
33.6 L
B)
67.2 L
C)
44.8 L
D)
22.4 L
 

 2. 

Which of the following statements concerning equal volumes of gases N2O and C3H8 , at the same temperature and pressure, is true?
A)
They have the same density
B)
They have the same number of moleucles
C)
The have the same number of atoms
D)
Both A and B
 

 3. 

A sample of Xe takes 75 seconds to effuse out of a container.  An unknown gas takes 37 seconds to effuse out of the identical container under identical conditions.  What is the most likelly identity of the unknown gas?
A)
He
B)
O2
C)
Kr
D)
Br2
 

 4. 

What is the molarity of a solution prepared by dissolving 7.31 g of Na2SO4 in enough water to make 225 mL of solution?
A)
1.64 M
B)
0.136 M
C)
0.229 M
D)
3.11 M
 

 5. 

Which of the following statements is correct concerning the reaction shown below:

mc005-1.jpg
A)
The fluorine atom is losing electrons, therefore it is reduced.
B)
The barium atom is gaining electrons, therefore it is oxidized.
C)
The flourine atom is gaining electrons, therefore it is oxidized.
D)
The barium atom is losing electrons, therefore it is oxidized.
 

 6. 

A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.  What is the mass percent of acetic acid in vinegar?
A)
9.23 %
B)
5.43 %
C)
0.184 %
D)
3.26 %
 

 7. 

The partial pressures of CH4 , N2 and O2 were found to be 100, 450, and 200 mmHg respectively.  What is the mole fraction of N2 in the mixture?
A)
0.600
B)
0.267
C)
0.750
D)
0.333
 

 8. 

What volume of 1.00 M sodium hydroxide is required to react completely with 50.0 mL of 3.00 M sulfuric acid?
A)
50.0 mL
B)
200. mL
C)
300. mL
D)
150. mL
 

 9. 

Which of the following are redox reactions?

mc009-1.jpg
A)
A only
B)
A and B
C)
A, B and C
D)
A, B, C and D
 

 10. 

A 5.0-L sample of Ar gas at constant temperature and a pressure of 0.25 atm is compressed to a volume of 5.0 mL.  What is the final pressure?
A)
25 atm
B)
250 atm
C)
0.025 atm
D)
2.5 atm
 

 11. 

Based on the reaction shown below, which of the following statements is correct?

mc011-1.jpg
A)
Silicon is reduced and carbon is oxidized
B)
Silicon is reduced and oxygen is oxidized
C)
Oxygen is reduced and carbon is oxidized
D)
Silicon is oxidized, and carbon is reduced
 

 12. 

What is the final pressure of the system when the valve between the two bulbs is opened in the diagram below?  (Assume constant temperature)

mc012-1.jpg
A)
2.5 atm
B)
2.0 atm
C)
1.3 atm
D)
0.50 atm
 

 13. 

Which of the following can act both as an oxidizing and a reducing agent?
A)
H2S
B)
HClO4
C)
NH3
D)
NO
 

 14. 

What is the partial pressure of oxygen in a mixture containg 16 g of O2 and 16 g of SO2 gas and a total pressure of 660 mmHg?
A)
110 mmHg
B)
220 mmHg
C)
330 mmHg
D)
440 mmHg
 

 15. 

The oxidation number of sulfur in CaS2O3 is
A)
+2
B)
+4
C)
–2
D)
–4
 



 
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