Question 1

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 E)
G) A) and E)

Question 2

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) C) and E)
G) None of the above B

Question 3

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

Question 4

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 B)
G) A) and C)

Question 5

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) B) and C)

Question 6

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

Question 7

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) A) and B)
G) All of the above

Question 8

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 B)
G) D) and E) A

Question 9

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

Accepted Answer

A) True 
 B)False  False

Question 10

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 E)
G) C) and D)

Question 11

Which of the following is a weak acid?

Accepted Answer

A)   H2SO4
B)   HNO3
C)   HF
D)   HBr
E)   HClF) All of the above
G) A) and D)

Question 12

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 B)
G) C) and E)

Question 13

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

Question 14

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

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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) A) and E)
G) A) and B)

Question 17

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) All of the above
G) B) and E)

Question 18

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

Question 19

Some covalent compounds dissolve in water to produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

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

Exam 4: Three Major Classes of Chemical Reactions

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

Correct Answer
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B

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

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

Correct Answer
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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

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

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 soluble in water?

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

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

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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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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Some covalent compounds dissolve in water to produce conducting solutions.

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

Correct Answer
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Exam 4: Three Major Classes of Chemical Reactions

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

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

Correct AnswerverifiedB

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

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

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

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

Which of the following is a weak acid?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following will be least soluble in water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Some covalent compounds dissolve in water to produce conducting solutions.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answer
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B

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

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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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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A

Correct Answer
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False

Correct Answer
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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. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

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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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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Correct Answer
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Correct Answer
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