In a battery, the following oxidation-reduction reaction is taking place: Mn2O3 + ZnO → 2 MnO2 + Zn What is undergoing reduction 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

How might you tell whether or not your toothpaste contained either calcium carbonate, CaC O3, or baking soda, NaHC O3, without looking at the ingredients label?

A) if the toothpaste bubbles when heated B) if the toothpaste bubbles when added to ammonia, such as window cleaner C) if the toothpaste produces a salt (NaCl)when added to HCl D) if the toothpaste bubbles when added to vinegar A) if the toothpaste bubbles when heated B) if the toothpaste bubbles when added to ammonia, such as window cleaner C) if the toothpaste produces a salt (NaCl)when added to HCl D) if the toothpaste bubbles when added to vinegar

A chemical equation for the combustion of propane, C3H8, is shown below. Through this reaction is the carbon oxidized or reduced? C3H8 + 5O2 → 3 CO2 + 4 H2O

A) The carbon is oxidized. B) The carbon is reduced. C) Some of the carbons are oxidized while others are reduced. D) The carbon is neither oxidized nor reduced. A) The carbon is oxidized. B) The carbon is reduced. C) Some of the carbons are oxidized while others are reduced. D) The carbon is neither oxidized nor reduced.

In a battery, if the following oxidation-reduction reactions takes place normally: Mn2O3 + ZnO → 2 MnO2 + Zn What reaction would be taking place if you were charging the battery?

A) 2 MnO2 + Zn → Mn2O3 + ZnO B) ZnO → Zn C) Mn2O3 → MnO2 D) all of the above E) none of the above A) 2 MnO2 + Zn → Mn2O3 + ZnO B) ZnO → Zn C) Mn2O3 → MnO2 D) all of the above E) none of the above

When lightning strikes, nitrogen molecules, N2, and oxygen molecules, O2, in the air react to form nitrates, NO3-, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?

A) The formation of nitrates is an example of oxidation. B) The formation of nitrates is an example of reduction. C) Both. The nitrogen is oxidized as it reacts with the oxygen while the oxygen is reduced. D) Neither. Although the bonds of both the N2 and O2 molecules are broken to form the NO3-, neither oxidation nor reduction occurs. A) The formation of nitrates is an example of oxidation. B) The formation of nitrates is an example of reduction. C) Both. The nitrogen is oxidized as it reacts with the oxygen while the oxygen is reduced. D) Neither. Although the bonds of both the N2 and O2 molecules are broken to form the NO3-, neither oxidation nor reduction occurs.

In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH- → ZnO + H2O + 2e- Rxn B: 2 MnO2 + H2O + 2e- → Mn2O3 + 2 OH- What is undergoing oxidation?

A) Zn B) ZnO C) MnO2 D) H2O E) OH- A) Zn B) ZnO C) MnO2 D) H2O E) OH-

Exam 18: Two Classes of Chemical Reactions

The amphoteric reaction between two water molecules is endothermic, which means that this reaction requires the input of energy in order to proceed: Energy + H₂O + H₂O → H₃O⁺ + O H^- The warmer the temperature of the water, the more thermal energy is available for this reaction, and the more hydronium and hydroxide ions are formed. Based on this information, should the value of K_w be expected to increase, decrease, or stay the same with increasing temperature?

(Multiple Choice)

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Question 161

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

(Multiple Choice)

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Question 162

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

(Multiple Choice)

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Question 163

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

(Multiple Choice)

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Question 164

How might you tell whether or not your toothpaste contained either calcium carbonate, CaC O₃, or baking soda, NaHC O₃, without looking at the ingredients label?

(Multiple Choice)

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Question 165

What is the relationship between the hydroxide ion and a water molecule?

(Multiple Choice)

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Question 166

A chemical equation for the combustion of propane, C₃H₈, is shown below. Through this reaction is the carbon oxidized or reduced? C₃H₈ + 5O₂ → 3 CO₂ + 4 H₂O

(Multiple Choice)

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Question 167

Water is 88.88 percent oxygen by mass. Oxygen is exactly what a fire needs to grow brighter and stronger. So why doesn't a fire grow brighter and stronger when water is added to it?

(Multiple Choice)

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Question 168

In a battery, if the following oxidation-reduction reactions takes place normally: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What reaction would be taking place if you were charging the battery?

(Multiple Choice)

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Question 169

Identify the acid or base behavior of each substance in these reactions: H₃O⁺ + Cl^- ⇌ H₂O + HCl

(Multiple Choice)

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Question 170

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 only a wire connecting a piece of iron (in container A) and a piece of copper (in container B), describe what happens.

(Multiple Choice)

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Question 171

When lightning strikes, nitrogen molecules, N₂, and oxygen molecules, O₂, in the air react to form nitrates, NO₃^-, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?

(Multiple Choice)

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Question 172

How does an atom's electronegativity relate to its ability to become oxidized?

(Multiple Choice)

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Question 173

The general chemical equation for photosynthesis is shown below. Through this reaction are the oxygens of the water molecules, H₂O, oxidized or reduced? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

(Multiple Choice)

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Question 174

What is the source of acid rain?

(Multiple Choice)

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Question 175

Why might a small piece of chalk made of calcium carbonate be useful for alleviating acid indigestion?

(Multiple Choice)

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Question 176

Which of the above images represents a solution of the strongest acid (HA)?

(Multiple Choice)

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Question 177

The general chemical equation for photosynthesis is shown below. Through this reaction is the carbon oxidized or reduced? How can you tell? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

(Multiple Choice)

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Question 178

If the pH of a solution is 10, what is the hydronium ion concentration?

(Multiple Choice)

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Question 179

In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH^- → ZnO + H₂O + 2e^- Rxn B: 2 MnO₂ + H₂O + 2e^- → Mn₂O₃ + 2 OH^- What is undergoing oxidation?

(Multiple Choice)

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Question 180

Showing 161 - 180 of 182

Exam 18: Two Classes of Chemical Reactions

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

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

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

How might you tell whether or not your toothpaste contained either calcium carbonate, CaC O3, or baking soda, NaHC O3, without looking at the ingredients label?

What is the relationship between the hydroxide ion and a water molecule?

A chemical equation for the combustion of propane, C3H8, is shown below. Through this reaction is the carbon oxidized or reduced? C3H8 + 5O2 → 3 CO2 + 4 H2O

Water is 88.88 percent oxygen by mass. Oxygen is exactly what a fire needs to grow brighter and stronger. So why doesn't a fire grow brighter and stronger when water is added to it?

In a battery, if the following oxidation-reduction reactions takes place normally: Mn2O3 + ZnO → 2 MnO2 + Zn What reaction would be taking place if you were charging the battery?

Identify the acid or base behavior of each substance in these reactions: H3O+ + Cl- ⇌ H2O + HCl

When lightning strikes, nitrogen molecules, N2, and oxygen molecules, O2, in the air react to form nitrates, NO3-, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?

How does an atom's electronegativity relate to its ability to become oxidized?

The general chemical equation for photosynthesis is shown below. Through this reaction are the oxygens of the water molecules, H2O, oxidized or reduced? 6 CO2 + 6 H2O → C6H12O6 + 6 O2

What is the source of acid rain?

Why might a small piece of chalk made of calcium carbonate be useful for alleviating acid indigestion?

Which of the above images represents a solution of the strongest acid (HA)?

The general chemical equation for photosynthesis is shown below. Through this reaction is the carbon oxidized or reduced? How can you tell? 6 CO2 + 6 H2O → C6H12O6 + 6 O2

If the pH of a solution is 10, what is the hydronium ion concentration?

In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH- → ZnO + H2O + 2e- Rxn B: 2 MnO2 + H2O + 2e- → Mn2O3 + 2 OH- What is undergoing oxidation?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

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Heat Transfer and Change of Phase

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Magnetism and Electromagnetic Induction

Waves and Sound

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The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

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Shaping Earths Surface

Geologic Timereading the Rock Record

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Driving Forces of Weather

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Prologue: the Nature of Science

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

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

How might you tell whether or not your toothpaste contained either calcium carbonate, CaC O₃, or baking soda, NaHC O₃, without looking at the ingredients label?

A chemical equation for the combustion of propane, C₃H₈, is shown below. Through this reaction is the carbon oxidized or reduced? C₃H₈ + 5O₂ → 3 CO₂ + 4 H₂O

In a battery, if the following oxidation-reduction reactions takes place normally: Mn₂O₃ + ZnO → 2 MnO₂ + Zn What reaction would be taking place if you were charging the battery?

Identify the acid or base behavior of each substance in these reactions: H₃O⁺ + Cl^- ⇌ H₂O + HCl

When lightning strikes, nitrogen molecules, N₂, and oxygen molecules, O₂, in the air react to form nitrates, NO₃^-, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?

The general chemical equation for photosynthesis is shown below. Through this reaction are the oxygens of the water molecules, H₂O, oxidized or reduced? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

The general chemical equation for photosynthesis is shown below. Through this reaction is the carbon oxidized or reduced? How can you tell? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH^- → ZnO + H₂O + 2e^- Rxn B: 2 MnO₂ + H₂O + 2e^- → Mn₂O₃ + 2 OH^- What is undergoing oxidation?