A) the gain of electrons B) the reduction of the number of electrons C) the loss of an electron from the valence shell D) the reaction of oxygen with a reductant E) the formation of red compounds in the presence of an oxidant A) the gain of electrons B) the reduction of the number of electrons C) the loss of an electron from the valence shell D) the reaction of oxygen with a reductant E) the formation of red compounds in the presence of an oxidant

What would the concentration of H3O+ be if the concentration of OH- was 1 × 10-1M? [H3O+] × [OH-] = Kw = 1 × 10-14

A) 1 × 10-3 B) 1 × 10-2 C) 1 × 10-4 D) 1 × 1013 E) none of the above A) 1 × 10-3 B) 1 × 10-2 C) 1 × 10-4 D) 1 × 1013 E) none of the above

In a battery, the following oxidation-reduction reactions are taking place: Mn2O3 + ZnO → 2 MnO2 + Zn What is undergoing an oxidation as written?

A) Zn B) ZnO C) MnO2 D) Mn2O3 E) none of the above A) Zn B) ZnO C) MnO2 D) Mn2O3 E) none of the above

What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-8M? [H3O+] × [OH-] = Kw = 1 × 10-14

A) 1 × 10-14 B) 1 × 10-6 C) 1 × 108 D) 1 × 106 E) 1 × 10-8 A) 1 × 10-14 B) 1 × 10-6 C) 1 × 108 D) 1 × 106 E) 1 × 10-8

Exam 18: Two Classes of Chemical Reactions

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A major source of chlorine gas, Cl₂, is from the electrolysis of brine, which is concentrated salt water, NaCl (aq). Which of the following is the balanced chemical reaction for this electrolysis reaction?

(Multiple Choice)

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Question 101

Identify the acid or base behavior of each substance in these reactions: HSO₄^- + H₂O ⇌ OH^- + H₂S

(Multiple Choice)

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Question 102

What is a reduction?

(Multiple Choice)

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Question 103

What would be the concentration of hydronium ions in a solution that had a pH = -3? Why would such a solution be impossible to prepare?

(Multiple Choice)

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Question 104

Your car lights were left on while you were shopping, and now your car battery is dead. Has the pH of the battery fluid increased or decreased?

(Multiple Choice)

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Question 105

What would the concentration of H₃O⁺ be if the concentration of OH^- was 1 × 10^-1M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14

(Multiple Choice)

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Question 106

In a battery, the following oxidation-reduction reactions are taking place: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What is undergoing an oxidation as written?

(Multiple Choice)

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Question 107

What best describes what happens when an acid such as HCl is mixed with water?

(Multiple Choice)

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Question 108

Which of the following statements about strong and weak acids is not true?

(Multiple Choice)

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Question 109

Which of the following solutions is the most acidic?

(Multiple Choice)

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Question 110

Which of the above illustrations shows a basic aqueous solution?

(Multiple Choice)

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Question 111

Chemical equations need to be balanced not only in terms of the number of atoms, but also by the charge. In other words, just as there should be the same number of atoms before and after the arrow of an equation, there should be the same charge. What set of coefficients is necessary to balance the following chemical equation? Ce⁴⁺+ Cl⁺ → Ce³⁺ + Cl₂

(Multiple Choice)

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Question 112

Which of the following statements best describes a cathode?

(Multiple Choice)

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Question 113

What is the primary difference between a fuel cell and a battery?

(Multiple Choice)

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Question 114

If you had a 1 M solution of a weak base what would be its pH?

(Multiple Choice)

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Question 115

Arrange the following images of an aqueous base solution in order of increasing base strength:

(Multiple Choice)

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Question 116

Which of the following statements about electrochemistry is not true?

(Multiple Choice)

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Question 117

Which of the following solutions is the most acidic?

(Multiple Choice)

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Question 118

What would the concentration of OH^- be if the concentration of H₃O⁺ was 1 × 10^-8M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14

(Multiple Choice)

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Question 119

Why don't the electrodes of a fuel cell deteriorate the way the electrodes of a battery do?

(Multiple Choice)

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Question 120

Showing 101 - 120 of 182

Exam 18: Two Classes of Chemical Reactions

A major source of chlorine gas, Cl2, is from the electrolysis of brine, which is concentrated salt water, NaCl (aq). Which of the following is the balanced chemical reaction for this electrolysis reaction?

Identify the acid or base behavior of each substance in these reactions: HSO4- + H2O ⇌ OH- + H2S

What is a reduction?

What would be the concentration of hydronium ions in a solution that had a pH = -3? Why would such a solution be impossible to prepare?

Your car lights were left on while you were shopping, and now your car battery is dead. Has the pH of the battery fluid increased or decreased?

What would the concentration of H3O+ be if the concentration of OH- was 1 × 10-1M? [H3O+] × [OH-] = Kw = 1 × 10-14

In a battery, the following oxidation-reduction reactions are taking place: Mn2O3 + ZnO → 2 MnO2 + Zn What is undergoing an oxidation as written?

What best describes what happens when an acid such as HCl is mixed with water?

Which of the following statements about strong and weak acids is not true?

Which of the following solutions is the most acidic?

Which of the above illustrations shows a basic aqueous solution?

Which of the following statements best describes a cathode?

What is the primary difference between a fuel cell and a battery?

If you had a 1 M solution of a weak base what would be its pH?

Arrange the following images of an aqueous base solution in order of increasing base strength:

Which of the following statements about electrochemistry is not true?

Which of the following solutions is the most acidic?

What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-8M? [H3O+] × [OH-] = Kw = 1 × 10-14

Why don't the electrodes of a fuel cell deteriorate the way the electrodes of a battery do?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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A major source of chlorine gas, Cl₂, is from the electrolysis of brine, which is concentrated salt water, NaCl (aq). Which of the following is the balanced chemical reaction for this electrolysis reaction?

Identify the acid or base behavior of each substance in these reactions: HSO₄^- + H₂O ⇌ OH^- + H₂S

What would the concentration of H₃O⁺ be if the concentration of OH^- was 1 × 10^-1M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14

In a battery, the following oxidation-reduction reactions are taking place: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What is undergoing an oxidation as written?

What would the concentration of OH^- be if the concentration of H₃O⁺ was 1 × 10^-8M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14