A) oxidized in the production of aluminum. B) reduced in the production of aluminum. C) both oxidized and reduced in the production of aluminum. D) neither oxidized nor reduced in the production of aluminum. A) oxidized in the production of aluminum. B) reduced in the production of aluminum. C) both oxidized and reduced in the production of aluminum. D) neither oxidized nor reduced in the production of aluminum.

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn+2 + 2e- Rxn B: 2 NH4+ + 2e- → 2 NH3 + H2 Which reaction is taking place at the anode?

A) rxn A B) rxn B C) Both reactions are happening at both the anode and cathode. D) Both reactions are happening at the electrode. E) The reaction takes place at the electrode,not the anode. A) rxn A B) rxn B C) Both reactions are happening at both the anode and cathode. D) Both reactions are happening at the electrode. E) The reaction takes place at the electrode,not the anode.

Exam 18: Two Classes of Chemical Reactions

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Jewelry is often manufactured by electroplating an expensive metal such as gold over a cheaper metal.A setup for this process can be sketched as follows: What would happen if the battery connections were suddenly reversed?

(Multiple Choice)

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Question 101

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

(Multiple Choice)

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Question 102

-In the above diagram,which atom behaves as the oxidizing agent,the lighter colored atom or the darker colored atom?

(Multiple Choice)

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Question 103

Which of the following statements about electrochemistry is not true?

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Question 104

According to the following reaction,which molecule is acting as a base? H₂O + NH₃ → OH^- + NH₄⁺

(Multiple Choice)

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Question 105

The main component of bleach is sodium hypochlorite,NaOCl,which consists of sodium ions,Na?,and hypochlorite ions, $\mathrm { OCl } ^ { 2 }$ What products are formed when this compound is reacted with the hydrochloric acid,HCl,of toilet bowl cleaner?

(Multiple Choice)

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Question 106

Why is recycling of aluminum better for the environment than electrolysis of bauxite (an aluminum ore)?

(Multiple Choice)

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Question 107

How many electrons are gained or lost in the following half-reaction? Na → Na⁺

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Question 108

Sodium metal is

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Question 109

Clorox is a laundry bleaching agent used to remove stains from white clothes.Suggest why the name begins with Clor- and ends with -ox.

(Multiple Choice)

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Question 110

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn⁺² + 2e^- Rxn B: 2 NH₄⁺ + 2e^- → 2 NH₃ + H₂ Which reaction is taking place at the anode?

(Multiple Choice)

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Question 111

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H₃PO₄ + H₂O ⇌ H₂PO₄^- + H₃O⁺

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Question 112

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O₂ → 2 Fe₂O₃ _{What is happening at the anodic region}_?

(Multiple Choice)

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Question 113

Which of the following statements about strong or weak acids is true?

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Question 114

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

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Question 115

For the following acid-base reaction,identify what compound is formed in the space marked. HNO₃ + KOH ⇌ ???? + H₂O

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Question 116

A weak acid is added to a concentrated solution of hydrochloric acid.Does the solution become more or less acidic?

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Question 117

According to the following reaction,which molecule is acting as an acid? H₂O + NH₃ → OH^- + NH₄⁺

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Question 118

Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?

(Multiple Choice)

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Question 119

For the following acid-base reaction,identify what compound is formed in the space marked. HCl + KOH ⇌ ???? + H₂O

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Question 120

Showing 101 - 120 of 177

Exam 18: Two Classes of Chemical Reactions

Jewelry is often manufactured by electroplating an expensive metal such as gold over a cheaper metal.A setup for this process can be sketched as follows: What would happen if the battery connections were suddenly reversed?

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

-In the above diagram,which atom behaves as the oxidizing agent,the lighter colored atom or the darker colored atom?

Which of the following statements about electrochemistry is not true?

According to the following reaction,which molecule is acting as a base? H2O + NH3 → OH- + NH4+

The main component of bleach is sodium hypochlorite,NaOCl,which consists of sodium ions,Na?,and hypochlorite ions, OCl2\mathrm { OCl } ^ { 2 }OCl2 What products are formed when this compound is reacted with the hydrochloric acid,HCl,of toilet bowl cleaner?

Why is recycling of aluminum better for the environment than electrolysis of bauxite (an aluminum ore)?

How many electrons are gained or lost in the following half-reaction? Na → Na+

Sodium metal is

Clorox is a laundry bleaching agent used to remove stains from white clothes.Suggest why the name begins with Clor- and ends with -ox.

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn+2 + 2e- Rxn B: 2 NH4+ + 2e- → 2 NH3 + H2 Which reaction is taking place at the anode?

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ⇌ H2PO4- + H3O+

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O2 → 2 Fe2O3 What is happening at the anodic region?

Which of the following statements about strong or weak acids is true?

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

For the following acid-base reaction,identify what compound is formed in the space marked. HNO3 + KOH ⇌ ???? + H2O

A weak acid is added to a concentrated solution of hydrochloric acid.Does the solution become more or less acidic?

According to the following reaction,which molecule is acting as an acid? H2O + NH3 → OH- + NH4+

Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?

For the following acid-base reaction,identify what compound is formed in the space marked. HCl + KOH ⇌ ???? + H2O

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 Time - Reading 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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According to the following reaction,which molecule is acting as a base? H₂O + NH₃ → OH^- + NH₄⁺

The main component of bleach is sodium hypochlorite,NaOCl,which consists of sodium ions,Na?,and hypochlorite ions, $\mathrm { OCl } ^ { 2 }$ What products are formed when this compound is reacted with the hydrochloric acid,HCl,of toilet bowl cleaner?

How many electrons are gained or lost in the following half-reaction? Na → Na⁺

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn⁺² + 2e^- Rxn B: 2 NH₄⁺ + 2e^- → 2 NH₃ + H₂ Which reaction is taking place at the anode?

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H₃PO₄ + H₂O ⇌ H₂PO₄^- + H₃O⁺

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O₂ → 2 Fe₂O₃ _{What is happening at the anodic region}_?

For the following acid-base reaction,identify what compound is formed in the space marked. HNO₃ + KOH ⇌ ???? + H₂O

According to the following reaction,which molecule is acting as an acid? H₂O + NH₃ → OH^- + NH₄⁺

For the following acid-base reaction,identify what compound is formed in the space marked. HCl + KOH ⇌ ???? + H₂O