Question 1

Which one of the following is not a redox reaction?

Accepted Answer

A)   2H2O2(aq)  → 2H2O(l)  + O2(g) 
B)   N2(g)  + 3H2(g)  → 2NH3(g) 
C)   BaCl2(aq)  + K2CrO4(aq)  → BaCrO4(aq)  + 2KCl(aq) 
D)   2Al(s)  + Fe2O3(s)  → Al2O3(s)  + 2Fe(s) 
E)   2H2O(g)  → 2H2(g)  + O2(g) F) None of the above
G) C) and E)

Question 2

Select the classification for the following reaction. Na2O(s)  + H2O(l)  → 2NaOH(aq)

Accepted Answer

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

Question 3

Copper(II)  sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Accepted Answer

A)   2.41 g
B)   1.82 g
C)   1.21 g
D)   0.909 g
E)   0.044 gF) B) and E)
G) B) and D)

Question 4

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

Accepted Answer

A)   41.3 g
B)   31.9 g
C)   16.1 g
D)   8.77 g
E)   2.41 gF) All of the above
G) None of the above

Question 5

A base

Accepted Answer

A)   causes phenolphthalein indicator to change from colorless to pink.
B)   donates a proton in a proton transfer reaction.
C)   accepts electrons in an electron transfer reaction.
D)   produces hydrogen ions in solution.
E)   None of these choices are correct.F) A) and D)
G) B) and E)

Question 6

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 I2
B)   0.029 g I2
C)   0.057 g I2
D)   0.046 g I2
E)   0.076 g I2F) All of the above
G) B) and C)

Question 7

Select the precipitate that forms when aqueous lead(II)  nitrate reacts with aqueous sodium sulfate.

Accepted Answer

A)   NaNO3
B)   Na2NO3
C)   PbSO4
D)   Pb2SO4
E)   PbSF) B) and C)
G) C) and D)

Question 8

The amount of calcium present in milk can be determined by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium if 0.429 g of calcium oxalate forms in a 125-g sample of milk when excess aqueous sodium oxalate is added? Na2C2O4(aq)  + Ca2+(aq)  → CaC2O4(s)  + 2Na+(aq)

Accepted Answer

A)   0.107%
B)   0.202%
C)   0.343%
D)   1.10%
E)   1.37%F) A) and B)
G) A) and E)

Question 9

Magnesium carbonate, MgCO3, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

Accepted Answer

A)   Mg2+ and CO32-
B)   Na+ and Cl-
C)   Mg2+ and Cl-
D)   Na+ and CO32-
E)   None of these choices are correct.F) A) and D)
G) C) and E)

Question 10

A 0.00100 mol sample of Ca(OH) 2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH) 2(s)  + 2HCl(aq)  → CaCl2(aq)  + H2O(l)

Accepted Answer

A)   0.0200 M
B)   0.0400 M
C)   0.0800 M
D)   4.00 × 10-5 M
E)   None of these choices are correct.F) A) and E)
G) B) and C)

Question 11

In the following reaction, what ions, if any, are spectator ions? Pb(NO3) 2(aq)  + 2NaCl(aq)  → PbCl2(s)  + 2NaNO3(aq)

Accepted Answer

A)   Pb2+(aq) , Cl-(aq) 
B)   Na+(aq) , NO3-(aq) 
C)   Pb2+(aq) , NO3-(aq) 
D)   Na+(aq) , Cl-(aq) 
E)   There are no spectator ions.F) A) and C)
G) A) and B)

Question 12

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Accepted Answer

A)   -2
B)   +2
C)   +4
D)   +5
E)   None of these choices are correct.F) C) and E)
G) A) and E)

Question 13

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 14

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na5P3O10.

Accepted Answer

A)   +3
B)   +5
C)   +10
D)   +15
E)   None of these choices are correct.F) A) and C)
G) A) and D)

Question 15

Select the precipitate that forms when the following reactants are mixed. Na2CO3(aq)  + BaCl2(aq)  →

Accepted Answer

A)   Ba2CO3
B)   BaCO3
C)   NaCl
D)   NaCl2
E)   BaOF) B) and C)
G) A) and E)

Question 16

In an acid-base (neutralization) reaction the equivalence point is the point where the indicator changes color.

Accepted Answer

A) True 
 B)False

Question 17

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Accepted Answer

A)   1.99 M
B)   1.50 M
C)   1.12 M
D)   0.502 M
E)   0.00199 MF) A) and B)
G) C) and D)

Question 18

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

Question 19

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

Question 20

Which of the following is a strong acid?

Accepted Answer

A)   H3PO4
B)   HNO3
C)   HF
D)   CH3COOH
E)   H2OF) A) and E)
G) B) and D)

Exam 4: Three Major Classes of Chemical Reactions

A 0.00100 mol sample of Ca(OH) ₂ requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH) ₂(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

Correct Answer
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Correct Answer
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Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Correct Answer
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Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

Correct Answer
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A base

Correct Answer
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Select the precipitate that forms when the following reactants are mixed. Na₂CO₃(aq) + BaCl₂(aq) →

Correct Answer
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Which of the following is a strong acid?

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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A combination reaction may also be a displacement reaction.

Correct Answer
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Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

Correct Answer
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Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄) ₂S? Aqueous ammonium chloride is the other product.

Correct Answer
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In the following reaction, what ions, if any, are spectator ions? Pb(NO₃) ₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

Correct Answer
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In an acid-base (neutralization) reaction the equivalence point is the point where the indicator changes color.

Correct Answer
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Which one of the following is not a redox reaction?

Correct Answer
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Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous sodium sulfate.

Correct Answer
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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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Select the classification for the following reaction. Na₂O(s) + H₂O(l) → 2NaOH(aq)

Correct Answer
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Magnesium carbonate, MgCO₃, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

Correct Answer
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A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

Correct Answer
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Exam 4: Three Major Classes of Chemical Reactions

A 0.00100 mol sample of Ca(OH) 2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH) 2(s) + 2HCl(aq) → CaCl2(aq) + H2O(l)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Correct AnswerverifiedShow Answer

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Correct AnswerverifiedShow Answer

A base

Correct AnswerverifiedShow Answer

Select the precipitate that forms when the following reactants are mixed. Na2CO3(aq) + BaCl2(aq) →

Correct AnswerverifiedShow Answer

Which of the following is a strong acid?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A combination reaction may also be a displacement reaction.

Correct AnswerverifiedShow Answer

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na5P3O10.

Correct AnswerverifiedShow Answer

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Correct AnswerverifiedShow Answer

In the following reaction, what ions, if any, are spectator ions? Pb(NO3) 2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Correct AnswerverifiedShow Answer

In an acid-base (neutralization) reaction the equivalence point is the point where the indicator changes color.

Correct AnswerverifiedShow Answer

Which one of the following is not a redox reaction?

Correct AnswerverifiedShow Answer

Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous sodium sulfate.

Correct AnswerverifiedShow Answer

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. Na2O(s) + H2O(l) → 2NaOH(aq)

Correct AnswerverifiedShow Answer

Magnesium carbonate, MgCO3, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

Correct AnswerverifiedShow Answer

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

Correct AnswerverifiedShow Answer

A 0.00100 mol sample of Ca(OH) ₂ requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH) ₂(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

Correct Answer
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Correct Answer
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Correct Answer
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Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

Correct Answer
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Correct Answer
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Select the precipitate that forms when the following reactants are mixed. Na₂CO₃(aq) + BaCl₂(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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Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

Correct Answer
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Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄) ₂S? Aqueous ammonium chloride is the other product.

Correct Answer
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In the following reaction, what ions, if any, are spectator ions? Pb(NO₃) ₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

Correct Answer
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Correct Answer
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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. Na₂O(s) + H₂O(l) → 2NaOH(aq)

Correct Answer
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Magnesium carbonate, MgCO₃, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

Correct Answer
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Correct Answer
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