The general chemical equation for photosynthesis is shown below.Through this reaction are the oxygens of the water molecules,H2O,oxidized or reduced? 6 $\mathrm { CO } _ { 2 }$ + 6 $\mathrm { H } _ { 2 }$ O ? $\mathrm { C } _ { 6 } \mathrm { H } _ { 12 } \mathrm { O } _ { 6 }$ + 6 $\mathrm { O } _ { 2 }$

A) The oxygens of the water molecules are oxidized. B) The oxygens of the water molecules are reduced. C) The oxygens of some of these water molecules are oxidized while others are reduced. D) The oxygens of the water molecules are neither oxidized nor reduced. A) The oxygens of the water molecules are oxidized. B) The oxygens of the water molecules are reduced. C) The oxygens of some of these water molecules are oxidized while others are reduced. D) The oxygens of the water molecules are neither oxidized nor reduced.

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

A) The copper starts to plate out on iron. B) The iron rusts in the water. C) The iron starts to plate out on the copper. D) The iron corrodes the copper. E) none of the above A) The copper starts to plate out on iron. B) The iron rusts in the water. C) The iron starts to plate out on the copper. D) The iron corrodes the copper. E) none of the above

Exam 18: Two Classes of Chemical Reactions

Copper atoms have a greater tendency to be reduced than iron atoms do.Was this good news or bad news for the Statue of Liberty,whose copper exterior was originally held together by steel rivets?

(Multiple Choice)

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Question 141

For the following acid-base reaction,identify which salt is formed. HCl + NaOH ⇌ ???? + H₂O

(Multiple Choice)

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Question 142

Aluminum metal undergoes the same basic corrosion process that iron does yet it does not decompose as rapidly.Why?

(Multiple Choice)

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Question 143

Water is formed from the reaction of an acid and a base.Why is it not classified as a salt?

(Multiple Choice)

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Question 144

Which of the following species is the reducing agent? 2 CuBr → 2Cu + Br₂

(Multiple Choice)

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Question 145

-Which of the above illustrations shows an acidic aqueous solution?

(Multiple Choice)

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Question 146

What element is behaves as the oxidizing agent in the following equation and what element behaves as the reducing agent? $\mathrm { Sn } ^ { 2 + }$ + 2 Ag ? Sn + 2 Ag?

(Multiple Choice)

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Question 147

For each of the following unbalanced equations,which is depicted: oxidation or reduction? a)Cr ? $\mathrm { Cr } ^ { 3 + }$ b)Sn ? $\mathrm { Sn } ( \mathrm { OH } ) 4 ^ { 2 - }$

(Multiple Choice)

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Question 148

Why might disposing of a lead-acid battery,nickel-cadmium battery or mercury battery in a landfill be a bad thing?

(Multiple Choice)

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Question 149

What happens to the corrosive properties of an acid and a base after they neutralize each other? Why?

(Multiple Choice)

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Question 150

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

(Multiple Choice)

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Question 151

Why does a battery that has thick zinc walls last longer than one that has thin zinc walls?

(Multiple Choice)

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Question 152

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

(Multiple Choice)

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Question 153

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 154

When lightning strikes,nitrogen molecules, $\mathrm { N } _ { 2 }$ ,and oxygen molecules, $\mathrm { O } _ { 2 }$ ,in the air react to form nitrates, $\mathrm { NO } _ { 3 }$ ?,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 155

Which of the following statements describes an acidic solution?

(Multiple Choice)

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Question 156

What would be the best explanation for the fact that most natural water has a pH of about 5.6?

(Multiple Choice)

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Question 157

The general chemical equation for photosynthesis is shown below.Through this reaction are the oxygens of the water molecules,H₂O,oxidized or reduced? 6 $\mathrm { CO } _ { 2 }$ + 6 $\mathrm { H } _ { 2 }$ O ? $\mathrm { C } _ { 6 } \mathrm { H } _ { 12 } \mathrm { O } _ { 6 }$ + 6 $\mathrm { O } _ { 2 }$

(Multiple Choice)

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Question 158

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

(Multiple Choice)

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Question 159

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

(Multiple Choice)

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Question 160

Showing 141 - 160 of 177

Exam 18: Two Classes of Chemical Reactions

Copper atoms have a greater tendency to be reduced than iron atoms do.Was this good news or bad news for the Statue of Liberty,whose copper exterior was originally held together by steel rivets?

For the following acid-base reaction,identify which salt is formed. HCl + NaOH ⇌ ???? + H2O

Aluminum metal undergoes the same basic corrosion process that iron does yet it does not decompose as rapidly.Why?

Water is formed from the reaction of an acid and a base.Why is it not classified as a salt?

Which of the following species is the reducing agent? 2 CuBr → 2Cu + Br2

-Which of the above illustrations shows an acidic aqueous solution?

What element is behaves as the oxidizing agent in the following equation and what element behaves as the reducing agent? Sn2+\mathrm { Sn } ^ { 2 + }Sn2+ + 2 Ag ? Sn + 2 Ag?

For each of the following unbalanced equations,which is depicted: oxidation or reduction? a)Cr ? Cr3+\mathrm { Cr } ^ { 3 + }Cr3+ b) Sn ? Sn(OH)42−\mathrm { Sn } ( \mathrm { OH } ) 4 ^ { 2 - }Sn(OH)42−

Why might disposing of a lead-acid battery,nickel-cadmium battery or mercury battery in a landfill be a bad thing?

What happens to the corrosive properties of an acid and a base after they neutralize each other? Why?

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

Why does a battery that has thick zinc walls last longer than one that has thin zinc walls?

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

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?

When lightning strikes,nitrogen molecules, N2\mathrm { N } _ { 2 }N2​ ,and oxygen molecules, O2\mathrm { O } _ { 2 }O2​ ,in the air react to form nitrates, NO3\mathrm { NO } _ { 3 }NO3​ ?,which come down in the rain to help fertilize the soil.Is this this an example of oxidation or reduction?

Which of the following statements describes an acidic solution?

What would be the best explanation for the fact that most natural water has a pH of about 5.6?

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

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

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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For the following acid-base reaction,identify which salt is formed. HCl + NaOH ⇌ ???? + H₂O

Which of the following species is the reducing agent? 2 CuBr → 2Cu + Br₂

What element is behaves as the oxidizing agent in the following equation and what element behaves as the reducing agent? $\mathrm { Sn } ^ { 2 + }$ + 2 Ag ? Sn + 2 Ag?

For each of the following unbalanced equations,which is depicted: oxidation or reduction? a)Cr ? $\mathrm { Cr } ^ { 3 + }$ b)Sn ? $\mathrm { Sn } ( \mathrm { OH } ) 4 ^ { 2 - }$

When lightning strikes,nitrogen molecules, $\mathrm { N } _ { 2 }$ ,and oxygen molecules, $\mathrm { O } _ { 2 }$ ,in the air react to form nitrates, $\mathrm { NO } _ { 3 }$ ?,which come down in the rain to help fertilize the soil.Is this this an example of oxidation or reduction?

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

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