Question 1

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II)  nitrate.

Accepted Answer

A)   CuS
B)   Cu2S
C)   NH4NO3
D)   NH4(NO3) 2
E)   CuSO4F) A) and D)
G) B) and C) A

Question 2

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

Accepted Answer

A) True 
 B)False  False

Question 3

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s)  + 5O2(g)  → P4O10(s)

Accepted Answer

A)   Combination
B)   Decomposition
C)   Displacement
D)   Acid-base
E)   PrecipitationF) C) and D)
G) A) and D)

Question 4

Some covalent compounds dissolve in water to produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 5

Select the classification for the following reaction. 2H2O2(aq)  → 2H2O(l)  + O2(g)

Accepted Answer

A)   Combination
B)   Decomposition
C)   Displacement
D)   Acid-base
E)   None of these choices are correct.F) B) and C)
G) C) and E)

Question 6

Select the classification for the following reaction. 2Na(s)  + 2H2O(l)  → 2NaOH(aq)  + H2(g)

Accepted Answer

A)   Precipitation
B)   Acid-base
C)   Redox
D)   Combination
E)   None of these choices are correct.F) B) and E)
G) A) and C)

Question 7

Select the classification for the following reaction. H2CO3(aq)  → H2O(l)  + CO2(g)

Accepted Answer

A)   Combination
B)   Decomposition
C)   Displacement
D)   Acid-base
E)   None of these choices are correct.F) D) and E)
G) None of the above B

Question 8

Aqueous potassium iodate (KIO3)  and potassium iodide (KI)  react in the presence of dilute hydrochloric acid, as shown below. KIO3(aq)  + 5KI(aq)  + 6HCl(aq)  → 3I2(aq)  + 6KCl(aq)  + 3H2O(l) 
What mass of iodine (I2)  is formed when 50.0 mL of 0.020 M KIO3 solution reacts with an excess of KI and HCl?

Accepted Answer

A)   0.13 g I2
B)   0.25 g I2
C)   0.38 g I2
D)   0.76 g I2
E)   None of these choices are correct.F) All of the above
G) A) and B)

Question 9

Identify all the spectator ions in the following reaction. 2KMnO4(aq)  + 10FeSO4(aq)  + 8H2SO4(aq)  → K2SO4(aq)  + 2MnSO4(aq)  + 5Fe2(SO4) 3(aq)  +8H2O(l)

Accepted Answer

A)   only K+
B)   only SO42-
C)   only K+ and SO42-
D)   only K+, SO42-, and Fe2+
E)   only K+, SO42-, Fe2+, and Mn2+F) A) and D)
G) A) and C)

Question 10

Which of the following is a weak base?

Accepted Answer

A)   NH3
B)   Ca(OH) 2
C)   Ba(OH) 2
D)   NaOH
E)   CH3COOHF) A) and E)
G) B) and D)

Question 11

Which of the following will be least soluble in water?

Accepted Answer

A)   potassium sulfate, K2SO4
B)   ammonium nitrate, NH4NO3
C)   chloromethane, CH3Cl
D)   calcium chloride, CaCl2
E)   ethanol, C2H6OF) All of the above
G) C) and D)

Question 12

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

Accepted Answer

A)   Hg2+(aq) 
B)   Cu(s) 
C)   Cu2+(aq) 
D)   Hg(l) 
E)   Hg2+(aq)  and Cu2+(aq) F) None of the above
G) A) and E)

Question 13

Which of the following solutions will be the poorest conductor of electrical current?

Accepted Answer

A)   sucrose, C12H22O11(aq) 
B)   sodium chloride, NaCl(aq) 
C)   potassium nitrate, KNO3(aq) 
D)   lithium hydroxide, LiOH(aq) 
E)   sulfuric acid, H2SO4(aq) F) A) and C)
G) A) and E)

Question 14

Select the classification for the following reaction. KOH(aq)  + HCl(aq)  → KCl(aq)  + H2O(l)

Accepted Answer

A)   Precipitation
B)   Acid-base
C)   Redox
D)   Combination
E)   None of these choices are correct.F) B) and E)
G) C) and D)

Question 15

Which of the following is a weak acid?

Accepted Answer

A)   H2SO4
B)   HNO3
C)   HF
D)   HBr
E)   HClF) A) and B)
G) A) and D)

Question 16

Which one of the following ionic compounds is insoluble in water?

Accepted Answer

A)   Na3PO4
B)   AgNO3
C)   NaCl
D)   CaCO3
E)   MgCl2F) B) and C)
G) B) and D)

Question 17

Select the classification for the following reaction. BaCl2(aq)  + K2SO4(aq)  → BaSO4(s)  + 2KCl(aq)

Accepted Answer

A)   Precipitation
B)   Acid-base
C)   Redox
D)   Decomposition
E)   None of these choices are correct.F) C) and E)
G) A) and E)

Question 18

In an acid-base (neutralization) reaction the indicator will change color at the end point.

Accepted Answer

A) True 
 B)False

Question 19

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)   I2(aq) 
B)   I-(aq) 
C)   S2O32-(aq) 
D)   S4O62-(aq) 
E)   S2O32-(aq)  and I-(aq) F) B) and E)
G) A) and B)

Question 20

Which one of the following ionic compounds is soluble in water?

Accepted Answer

A)   Na2S
B)   PbI2
C)   AgCl
D)   CuS
E)   Ca3(PO4) 2F) A) and C)
G) None of the above

Exam 4: Three Major Classes of Chemical Reactions

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

Correct Answer
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A

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

Correct Answer
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False

The compound P₄O₁₀ is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) → P₄O₁₀(s)

Correct Answer
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Some covalent compounds dissolve in water to produce conducting solutions.

Correct Answer
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Select the classification for the following reaction. 2H₂O₂(aq) → 2H₂O(l) + O₂(g)

Correct Answer
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Select the classification for the following reaction. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

Correct Answer
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Select the classification for the following reaction. H₂CO₃(aq) → H₂O(l) + CO₂(g)

Correct Answer
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B

Correct Answer
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Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄) ₃(aq) +8H₂O(l)

Correct Answer
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Which of the following is a weak base?

Correct Answer
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Which of the following will be least soluble in water?

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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Which of the following solutions will be the poorest conductor of electrical current?

Correct Answer
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Select the classification for the following reaction. KOH(aq) + HCl(aq) → KCl(aq) + H₂O(l)

Correct Answer
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Which of the following is a weak acid?

Correct Answer
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Which one of the following ionic compounds is insoluble in water?

Correct Answer
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Select the classification for the following reaction. BaCl₂(aq) + K₂SO₄(aq) → BaSO₄(s) + 2KCl(aq)

Correct Answer
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In an acid-base (neutralization) reaction the indicator will change color at the end point.

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. 2S₂O₃^2-(aq) + I₂(aq) → S₄O₆^2-(aq) + 2I^-(aq)

Correct Answer
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Which one of the following ionic compounds is soluble in water?

Correct Answer
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Exam 4: Three Major Classes of Chemical Reactions

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

Correct AnswerverifiedA

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

Correct AnswerverifiedFalse

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s) + 5O2(g) → P4O10(s)

Correct AnswerverifiedShow Answer

Some covalent compounds dissolve in water to produce conducting solutions.

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. 2H2O2(aq) → 2H2O(l) + O2(g)

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. H2CO3(aq) → H2O(l) + CO2(g)

Correct AnswerverifiedB

Aqueous potassium iodate (KIO3) and potassium iodide (KI) react in the presence of dilute hydrochloric acid, as shown below. KIO3(aq) + 5KI(aq) + 6HCl(aq) → 3I2(aq) + 6KCl(aq) + 3H2O(l) What mass of iodine (I2) is formed when 50.0 mL of 0.020 M KIO3 solution reacts with an excess of KI and HCl?

Correct AnswerverifiedShow Answer

Identify all the spectator ions in the following reaction. 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) → K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4) 3(aq) +8H2O(l)

Correct AnswerverifiedShow Answer

Which of the following is a weak base?

Correct AnswerverifiedShow Answer

Which of the following will be least soluble in water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following solutions will be the poorest conductor of electrical current?

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. KOH(aq) + HCl(aq) → KCl(aq) + H2O(l)

Correct AnswerverifiedShow Answer

Which of the following is a weak acid?

Correct AnswerverifiedShow Answer

Which one of the following ionic compounds is insoluble in water?

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. BaCl2(aq) + K2SO4(aq) → BaSO4(s) + 2KCl(aq)

Correct AnswerverifiedShow Answer

In an acid-base (neutralization) reaction the indicator will change color at the end point.

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

Which one of the following ionic compounds is soluble in water?

Correct AnswerverifiedShow Answer

Correct Answer
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A

Correct Answer
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False

The compound P₄O₁₀ is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) → P₄O₁₀(s)

Correct Answer
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Correct Answer
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Select the classification for the following reaction. 2H₂O₂(aq) → 2H₂O(l) + O₂(g)

Correct Answer
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Select the classification for the following reaction. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

Correct Answer
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Select the classification for the following reaction. H₂CO₃(aq) → H₂O(l) + CO₂(g)

Correct Answer
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B

Correct Answer
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Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄) ₃(aq) +8H₂O(l)

Correct Answer
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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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Correct Answer
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Select the classification for the following reaction. KOH(aq) + HCl(aq) → KCl(aq) + H₂O(l)

Correct Answer
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Correct Answer
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Correct Answer
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Select the classification for the following reaction. BaCl₂(aq) + K₂SO₄(aq) → BaSO₄(s) + 2KCl(aq)

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. 2S₂O₃^2-(aq) + I₂(aq) → S₄O₆^2-(aq) + 2I^-(aq)

Correct Answer
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Correct Answer
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