Question 1

Select the classification for the following reaction. 2NaCl(l)  2(g)  A) Acid-base B) Precipitation C) Combination D) Displacement E) Decomposition" class="answers-bank-image d-inline" rel="preload" > 2Na(l)  + Cl2(g)

Accepted Answer

A)  Acid-base
B)  Precipitation
C)  Combination
D)  Displacement
E)  DecompositionF) B) and C)
G) A) and C)

Question 2

How many moles of H+(aq)  ions are present in 1.25 L of 0.75 M nitric acid?

Accepted Answer

A)  0.60 mol
B)  0.75 mol
C)  0.94 mol
D)  1.7 mol
E)  1.9 molF) A) and D)
G) A) and E)

Question 3

Aqueous potassium iodate (KIO3)  and potassium iodide (KI)  react in the presence of dilute hydrochloric acid (HCl) , as shown below. KIO3(aq)  + 5KI(aq)  + 6HCl(aq)  → 3I2(aq)  + 6KCl(aq)  + 3H2O(l) 
What mass of iodine (I2)  is formed when 15.0 mL of 0.0050 M KIO3 solution reacts with 30.0 mL of 0.010 M KI solution in the presence of excess HCl?

Accepted Answer

A)  0.023 g I 2
B)  0.029 g I 2
C)  0.057 g I 2
D)  0.046 g I 2
E)  0.076 g I 2F) All of the above
G) A) and B)

Question 4

Identify the oxidizing agent in the following redox reaction. Hg2+(aq)  + Cu(s)  → Cu2+(aq)  + Hg(l)

Accepted Answer

A)  Hg 2+( aq) 
B)  Cu( s) 
C)  Cu 2+( aq) 
D)  Hg( l) 
E)  Hg 2+( aq) and Cu 2+( aq) F) C) and D)
G) A) and E)

Question 5

Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32-(aq)  + I2(aq)  → S4O62-(aq)  + 2I-(aq)

Accepted Answer

A)  I 2( aq) 
B)  I −( aq) 
C)  S 2O 3 2−( aq) 
D)  S 4O 6 2−( aq) 
E)  S 2O 3 2−( aq) and I −( aq) F) C) and D)
G) B) and D)

Question 6

During a titration, the following data were collected. A 25 mL portion of an unknown acid solution was titrated with 1.0 M NaOH. It required 65 mL of the base to neutralize the sample. How many moles of acid are present in 3.0 liters of this unknown solution?

Accepted Answer

A)  2.6 moles
B)  0.9 moles
C)  8.7 moles
D)  7.8 moles
E)  5.6 molesF) A) and B)
G) D) and E)

Question 7

1.0M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

Accepted Answer

A)  NaOH
B)  CH 3CH 2OH (ethanol) 
C)  KBr
D)  CH 3COOH (acetic acid) 
E)  HClO 4F) A) and B)
G) C) and E)

Question 8

The oxidation numbers of P, S, and Cl in H2PO2-, H2S, and KClO4 are, respectively

Accepted Answer

A)  −1, −1, +3.
B)  −1, −2, +7.
C)  +1, −2, +7.
D)  −1, −2, +3.
E)  +1, +2, +7.F) A) and C)
G) A) and B)

Question 9

Consider the reaction: 3Co2+(aq)  + 6NO3(aq)  + 6Na+(aq)  + 2PO43-(aq)  → Co3(PO4) 2(s)  + 6Na+(aq)  + 6NO3(aq) 
Identify the net ionic equation for this reaction.

Accepted Answer

A)  Na +( aq)  + NO 3 −( aq) → NaNO 3( aq) 
B)  3Co 2+( aq) + NO 3 −( aq) + Na +( aq) + 2PO 4 3−( aq) → Co 3(PO 4) 2( s) + NaNO 3( aq) 
C)  3Co 2+( aq) + 6NO 3 −( aq) + 6Na +( aq) + 2PO 4 3−( aq) → Co 3(PO 4) 2( s) + 6NaNO 3( aq) 
D)  3Co 2+( aq) + 2PO 4 3−( aq) → Co 3(PO 4) 2( s) 
E)  None of these choices are correct.F) None of the above
G) A) and B)

Question 10

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Accepted Answer

A)  3.86 M
B)  0.743 M
C)  0.222 M
D)  0.123 M
E)  0.114 MF) All of the above
G) B) and D)

Question 11

All acid-base reactions produce a salt and water as the only products.

Accepted Answer

A) True 
 B)False

Exam 4: Three Major Classes of Chemical Reactions

1.0M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

Correct Answer
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Correct Answer
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Identify the oxidizing agent in the following redox reaction. Hg²⁺(aq) + Cu(s) → Cu²⁺(aq) + Hg(l)

Correct Answer
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How many moles of H⁺(aq) ions are present in 1.25 L of 0.75 M nitric acid?

Correct Answer
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Select the classification for the following reaction. 2NaCl(l) 2Na(l) + Cl₂(g)

Correct Answer
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All acid-base reactions produce a salt and water as the only products.

Correct Answer
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Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃²^-(aq) + I₂(aq) → S₄O₆²^-(aq) + 2I^-(aq)

Correct Answer
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Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct Answer
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The oxidation numbers of P, S, and Cl in H₂PO₂^-, H₂S, and KClO₄ are, respectively

Correct Answer
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During a titration, the following data were collected. A 25 mL portion of an unknown acid solution was titrated with 1.0 M NaOH. It required 65 mL of the base to neutralize the sample. How many moles of acid are present in 3.0 liters of this unknown solution?

Correct Answer
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Consider the reaction: 3Co²⁺(aq) + 6NO₃(aq) + 6Na⁺(aq) + 2PO₄³^-(aq) → Co₃(PO₄) ₂(s) + 6Na⁺(aq) + 6NO₃(aq) Identify the net ionic equation for this reaction.

Correct Answer
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Exam 4: Three Major Classes of Chemical Reactions

1.0M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Identify the oxidizing agent in the following redox reaction. Hg2+(aq) + Cu(s) → Cu2+(aq) + Hg(l)

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How many moles of H+(aq) ions are present in 1.25 L of 0.75 M nitric acid?

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Select the classification for the following reaction. 2NaCl(l) 2Na(l) + Cl2(g)

Correct AnswerverifiedShow Answer

All acid-base reactions produce a salt and water as the only products.

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Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32-(aq) + I2(aq) → S4O62-(aq) + 2I-(aq)

Correct AnswerverifiedShow Answer

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct AnswerverifiedShow Answer

The oxidation numbers of P, S, and Cl in H2PO2-, H2S, and KClO4 are, respectively

Correct AnswerverifiedShow Answer

During a titration, the following data were collected. A 25 mL portion of an unknown acid solution was titrated with 1.0 M NaOH. It required 65 mL of the base to neutralize the sample. How many moles of acid are present in 3.0 liters of this unknown solution?

Correct AnswerverifiedShow Answer

Consider the reaction: 3Co2+(aq) + 6NO3(aq) + 6Na+(aq) + 2PO43-(aq) → Co3(PO4) 2(s) + 6Na+(aq) + 6NO3(aq) Identify the net ionic equation for this reaction.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Identify the oxidizing agent in the following redox reaction. Hg²⁺(aq) + Cu(s) → Cu²⁺(aq) + Hg(l)

Correct Answer
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How many moles of H⁺(aq) ions are present in 1.25 L of 0.75 M nitric acid?

Correct Answer
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Select the classification for the following reaction. 2NaCl(l) 2Na(l) + Cl₂(g)

Correct Answer
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Correct Answer
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Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃²^-(aq) + I₂(aq) → S₄O₆²^-(aq) + 2I^-(aq)

Correct Answer
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Correct Answer
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The oxidation numbers of P, S, and Cl in H₂PO₂^-, H₂S, and KClO₄ are, respectively

Correct Answer
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Correct Answer
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Consider the reaction: 3Co²⁺(aq) + 6NO₃(aq) + 6Na⁺(aq) + 2PO₄³^-(aq) → Co₃(PO₄) ₂(s) + 6Na⁺(aq) + 6NO₃(aq) Identify the net ionic equation for this reaction.

Correct Answer
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