Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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) C) and E)
G) B) and E)

Question 3

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 D)
G) C) and D)

Question 4

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) D) and E)
G) B) and D)

Question 5

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 D)
G) All of the above

Question 6

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) B) and C)
G) C) and D)

Question 7

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) A) and C)
G) B) and D)

Question 8

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) C) and E)
G) A) and D)

Question 9

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) A) and C)
G) D) and E)

Question 10

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) D) and E)
G) A) and C)

Question 11

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 C)
G) A) and E)

Exam 4: Three Major Classes of Chemical Reactions

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

Correct Answer
verified

Exam 4: Three Major Classes of Chemical Reactions

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

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

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

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

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

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct Answer
verified

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
verified

Correct Answer
verified

Correct Answer
verified

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
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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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