Question 1

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

Accepted Answer

A) True 
 B)False  False

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

Question 3

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)  CuSO4 
A)  CuS 
B)  Cu2S 
C)  NH4NO3 
D)  NH4(NO3)2 
E)  CuSO4 A

Question 4

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

Question 5

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

Accepted Answer

A)  Na3PO4 
B)  AgNO3 
C)  NaCl 
D)  CaCO3 
E)  MgCl2 
A)  Na3PO4 
B)  AgNO3 
C)  NaCl 
D)  CaCO3 
E)  MgCl2

Question 6

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. 
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.

Question 7

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, C2H6O 
A)  potassium sulfate, K2SO4 
B)  ammonium nitrate, NH4NO3 
C)  chloromethane, CH3Cl 
D)  calcium chloride, CaCl2 
E)  ethanol, C2H6O

Question 8

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

Question 9

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

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

Question 11

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

Question 12

Some covalent compounds dissolve in water to produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 13

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

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

Question 15

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

Accepted Answer

A)  Na2S 
B)  PbI2 
C)  AgCl 
D)  CuS 
E)  Ca3(PO4)2 
A)  Na2S 
B)  PbI2 
C)  AgCl 
D)  CuS 
E)  Ca3(PO4)2

Question 16

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) 
A)  Hg2+(aq) 
B)  Cu(s) 
C)  Cu2+(aq) 
D)  Hg(l) 
E)  Hg2+(aq) and Cu2+(aq)

Question 17

Which of the following is a weak acid?

Accepted Answer

A)  H2SO4 
B)  HNO3 
C)  HF 
D)  HBr 
E)  HCl 
A)  H2SO4 
B)  HNO3 
C)  HF 
D)  HBr 
E)  HCl

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

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)  Precipitation 
A)  Combination 
B)  Decomposition 
C)  Displacement 
D)  Acid-base 
E)  Precipitation

Question 20

Which of the following is a weak base?

Accepted Answer

A)  NH3 
B)  Ca(OH)2 
C)  Ba(OH)2 
D)  NaOH 
E)  CH3COOH 
A)  NH3 
B)  Ca(OH)2 
C)  Ba(OH)2 
D)  NaOH 
E)  CH3COOH

Exam 4: Three Major Classes of Chemical Reactions

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

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

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

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

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

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?

Which of the following will be least soluble in water?

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)

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

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

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)

Some covalent compounds dissolve in water to produce conducting solutions.

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

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

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

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

Which of the following is a weak acid?

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

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)

Which of the following is a weak base?

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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

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

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)

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

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)

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

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

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

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)