The following set of redox reactions takes place when iron is dipped into a solution of copper ions. Fe → Fe+2 + 2e- Cu+2 + 2e- → Cu Which of the following describes what is happening with the electrons in the solution?

A) The iron metal is releasing electrons and they are traveling to the copper ions. B) The copper is releasing electrons and they are traveling to the iron ions. C) The iron ions are gaining electrons from the copper metal. D) The copper ions are releasing electrons and they are traveling to the iron metal. E) none of the above A) The iron metal is releasing electrons and they are traveling to the copper ions. B) The copper is releasing electrons and they are traveling to the iron ions. C) The iron ions are gaining electrons from the copper metal. D) The copper ions are releasing electrons and they are traveling to the iron metal. E) none of the above

In a battery, the following oxidation-reduction reactions are taking place: Mn2O3 + ZnO → 2 MnO2 + Zn What is being formed at the anode?

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

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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The following set of redox reactions takes place when iron is dipped into a solution of copper ions. Fe → Fe⁺² + 2e- Cu⁺² + 2e- → Cu Which of the following describes what is happening with the electrons in the solution?

(Multiple Choice)

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Question 121

When a hydronium ion concentration equals 1 × 10^-4 moles per liter, what is the pH of the solution? Is the solution acidic or basic?

(Multiple Choice)

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Question 122

Why is carbon dioxide able to be stored more effectively in ocean water vs. fresh water?

(Multiple Choice)

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Question 123

When the hydronium ion concentration equals 1 mole per liter, what is the pH of the solution? Is the solution acidic or basic?

(Multiple Choice)

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Question 124

In a battery, the following oxidation-reduction reactions are taking place: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What is being formed at the anode?

(Multiple Choice)

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Question 125

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

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Question 126

The following set of redox reactions takes place as shown. Container A Container B Fe → Fe⁺² + 2e- Cu⁺² + 2e- → Cu If you had two containers filled with the ion solution described above with a wire connecting a piece of iron (in container A) and a piece of copper (in container B) and a salt-bridge connecting the two containers, which way do the electrons flow?

(Multiple Choice)

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Question 127

Which of the following species is undergoing oxidation? 2 CuBr → 2Cu + Br₂

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Question 128

Why is the air over an open flame always moist?

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Question 129

Pour vinegar onto beach sand from the Caribbean and the result is a lot of froth and bubbles. Pour vinegar onto beach sand from California, however, and nothing happens. Why?

(Multiple Choice)

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Question 130

What is one of the advantages of a fuel cell?

(Multiple Choice)

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Question 131

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?

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Question 132

What is one of the drawbacks to using fuel cells?

(Multiple Choice)

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Question 133

Qualitatively, what happens to the hydronium ion concentration if you increase the hydroxide ion concentration?

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Question 134

Which of the following materials is most likely to act as a reducing agent?

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Question 135

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

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Question 136

How would connecting iron with a wire to a piece of metal like copper, which undergoes reduction very easily, affect the rate at which the iron corrodes?

(Multiple Choice)

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Question 137

What do the brackets in the following equation represent? [H₃O⁺] × [OH^-] = K_w

(Multiple Choice)

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Question 138

One of the products of combustion is water. Why doesn't this water extinguish the combustion?

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Question 139

An acid and a base react to form a salt, which consists of positive and negative ions. Which forms the positive ions: the acid or the base? Which forms the negative ions?

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Question 140

Showing 121 - 140 of 182

Exam 18: Two Classes of Chemical Reactions

The following set of redox reactions takes place when iron is dipped into a solution of copper ions. Fe → Fe+2 + 2e- Cu+2 + 2e- → Cu Which of the following describes what is happening with the electrons in the solution?

When a hydronium ion concentration equals 1 × 10-4 moles per liter, what is the pH of the solution? Is the solution acidic or basic?

Why is carbon dioxide able to be stored more effectively in ocean water vs. fresh water?

When the hydronium ion concentration equals 1 mole per liter, what is the pH of the solution? Is the solution acidic or basic?

In a battery, the following oxidation-reduction reactions are taking place: Mn2O3 + ZnO → 2 MnO2 + Zn What is being formed at the anode?

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

Which of the following species is undergoing oxidation? 2 CuBr → 2Cu + Br2

Why is the air over an open flame always moist?

Pour vinegar onto beach sand from the Caribbean and the result is a lot of froth and bubbles. Pour vinegar onto beach sand from California, however, and nothing happens. Why?

What is one of the advantages of a fuel cell?

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?

What is one of the drawbacks to using fuel cells?

Qualitatively, what happens to the hydronium ion concentration if you increase the hydroxide ion concentration?

Which of the following materials is most likely to act as a reducing agent?

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

How would connecting iron with a wire to a piece of metal like copper, which undergoes reduction very easily, affect the rate at which the iron corrodes?

What do the brackets in the following equation represent? [H3O+] × [OH-] = Kw

One of the products of combustion is water. Why doesn't this water extinguish the combustion?

An acid and a base react to form a salt, which consists of positive and negative ions. Which forms the positive ions: the acid or the base? Which forms the negative ions?

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The following set of redox reactions takes place when iron is dipped into a solution of copper ions. Fe → Fe⁺² + 2e- Cu⁺² + 2e- → Cu Which of the following describes what is happening with the electrons in the solution?

When a hydronium ion concentration equals 1 × 10^-4 moles per liter, what is the pH of the solution? Is the solution acidic or basic?

In a battery, the following oxidation-reduction reactions are taking place: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What is being formed at the anode?

Which of the following species is undergoing oxidation? 2 CuBr → 2Cu + Br₂

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

What do the brackets in the following equation represent? [H₃O⁺] × [OH^-] = K_w