Question 1

Atoms or molecules with unpaired electrons are called _____.

Accepted Answer

A)  inert elements 
B)  reducers 
C)  oxidizers 
D)  free radicals 
E)  antioxidants 
A)  inert elements 
B)  reducers 
C)  oxidizers 
D)  free radicals 
E)  antioxidants

Question 2

Which of these occurs(s) during reduction?

Accepted Answer

A)  Gaining electrons 
B)  Gaining hydrogen 
C)  Losing oxygen 
D)  All of these 
E)  None of these 
A)  Gaining electrons 
B)  Gaining hydrogen 
C)  Losing oxygen 
D)  All of these 
E)  None of these

Question 3

_____ is used as a coating  in the galvanization process.

Accepted Answer

A)  Magnesium 
B)  Zinc 
C)  Chlorine 
D)  Iodine 
E)  Carbon 
A)  Magnesium 
B)  Zinc 
C)  Chlorine 
D)  Iodine 
E)  Carbon

Question 4

Which substance is reduced in this redox equation? HF + Cl2 → F2 + HCl

Accepted Answer

A)  HF 
B)  Cl2 
C)  F 
D)  HCl 
E)  None of these 
A)  HF 
B)  Cl2 
C)  F 
D)  HCl 
E)  None of these

Question 5

Identify a true statement about photosynthesis.

Accepted Answer

A)  Carbon is oxidized during photosynthesis. 
B)  Photosynthesis is an endothermic process. 
C)  Carbon dioxide and water are produced during photosynthesis. 
D)  Photosynthesis helps in the oxidation of glucose. 
E)  Photosynthesis can take place in the absence of sunlight. 
A)  Carbon is oxidized during photosynthesis. 
B)  Photosynthesis is an endothermic process. 
C)  Carbon dioxide and water are produced during photosynthesis. 
D)  Photosynthesis helps in the oxidation of glucose. 
E)  Photosynthesis can take place in the absence of sunlight.

Question 6

The most common method used to protect underground pipes from rusting is _____.

Accepted Answer

A)  covering them with paint 
B)  attaching a more active metal to them 
C)  treating them with sodium hydroxide 
D)  coating them with another metal whose oxide is less stable 
E)  treating them with hydrochloric acid 
A)  covering them with paint 
B)  attaching a more active metal to them 
C)  treating them with sodium hydroxide 
D)  coating them with another metal whose oxide is less stable 
E)  treating them with hydrochloric acid

Question 7

Redox reactions involve the transfer of _____.

Accepted Answer

A)  hydrogen 
B)  oxygen 
C)  protons 
D)  electrons 
E)  neutrons 
A)  hydrogen 
B)  oxygen 
C)  protons 
D)  electrons 
E)  neutrons

Question 8

Which of these substances is the most common oxidizing agent?

Accepted Answer

A)  CO 
B)  H3O+ 
C)  O2 
D)  H2 
E)  C 
A)  CO 
B)  H3O+ 
C)  O2 
D)  H2 
E)  C

Question 9

Which of these is/are oxidation-reduction reaction(s)?
I. PCl3 + 3H2O → 3HCl + H3PO3
II. Fe2O3 + 3CO → 2Fe + 3CO2
III. CaCO3 + HClO3 → Ca(ClO3)2 + CO2 + H2O

Accepted Answer

A)  I only 
B)  II only 
C)  I and II 
D)  I and III 
E)  I, II, and III 
A)  I only 
B)  II only 
C)  I and II 
D)  I and III 
E)  I, II, and III

Question 10

Which of these is a possible anodic reaction that  occurs during the corrosion of iron?

Accepted Answer

A)  2Fe(s) → 2Fe2+(aq) + 4e −  
B)  2H+(aq) + 2e −  → H2(g) 
C)  2H2O(l) + 2e −  → H2(g) + 2OH − (aq) 
D)  O2(g) + 2H2O(l) + 4e −  → 4OH − (aq) 
E)  SO2(g) + O2(g) + 2e −  → SO42 − (aq) 
A)  2Fe(s) → 2Fe2+(aq) + 4e −  
B)  2H+(aq) + 2e −  → H2(g) 
C)  2H2O(l) + 2e −  → H2(g) + 2OH − (aq) 
D)  O2(g) + 2H2O(l) + 4e −  → 4OH − (aq) 
E)  SO2(g) + O2(g) + 2e −  → SO42 − (aq)

Question 11

Which of the following is true of fuel cells?

Accepted Answer

A)  Efficiency of fuel cells ranges from 50% to 80%. 
B)  Reactants in fuel cells deplete over time. 
C)  Fuel cells can only be used in small devices. 
D)  A common fuel cell is the Leclanché dry cell. 
E)  All of these    are true of fuel cells. 
A)  Efficiency of fuel cells ranges from 50% to 80%. 
B)  Reactants in fuel cells deplete over time. 
C)  Fuel cells can only be used in small devices. 
D)  A common fuel cell is the Leclanché dry cell. 
E)  All of these    are true of fuel cells.

Question 12

Which of these methods is/are utilized to help prevent the rusting of iron?
I. Painting iron
II. Treating iron with sulfuric acid
III. Coating iron with a metal that is more likely to oxidize

Accepted Answer

A)  I only 
B)  II only 
C)  I and III 
D)  I, II, and III 
E)  III only 
A)  I only 
B)  II only 
C)  I and III 
D)  I, II, and III 
E)  III only

Question 13

Which of these are the primary components in an automobile battery?

Accepted Answer

A)  Lead and water 
B)  Copper and lead 
C)  Copper and zinc 
D)  Lead and sulfuric acid 
E)  Copper and sulfuric acid 
A)  Lead and water 
B)  Copper and lead 
C)  Copper and zinc 
D)  Lead and sulfuric acid 
E)  Copper and sulfuric acid

Question 14

Which of these statements about redox reactions is incorrect ?

Accepted Answer

A)  Oxidation is the loss of oxygen. 
B)  Oxidation is the loss of electrons. 
C)  Reduction is the gain of electrons. 
D)  Oxidation is the loss of hydrogen. 
E)  Reduction is the gain of hydrogen. 
A)  Oxidation is the loss of oxygen. 
B)  Oxidation is the loss of electrons. 
C)  Reduction is the gain of electrons. 
D)  Oxidation is the loss of hydrogen. 
E)  Reduction is the gain of hydrogen.

Question 15

Which of these occur(s) during oxidation?

Accepted Answer

A)  Gaining electrons 
B)  Gaining hydrogen 
C)  Losing oxygen 
D)  All of these 
E)  None of these 
A)  Gaining electrons 
B)  Gaining hydrogen 
C)  Losing oxygen 
D)  All of these 
E)  None of these

Question 16

Which substance is the reducing agent in this redox equation? HF + Cl2 → F2 + HCl

Accepted Answer

A)  HF 
B)  Cl2 
C)  F 
D)  HCl 
E)  None of these 
A)  HF 
B)  Cl2 
C)  F 
D)  HCl 
E)  None of these

Question 17

Which of these are oxidation-reduction reactions?
I. 3H2 + N2 → 2NH3
II. Cu2O + C → 2Cu + CO
III. Fe2O3 + 3CO → 2Fe + CO2
IV. 2K + Br2 → 2KBr

Accepted Answer

A)  I and III 
B)  III and IV 
C)  I and II 
D)  I, II, and III 
E)  I, II, III, and IV 
A)  I and III 
B)  III and IV 
C)  I and II 
D)  I, II, and III 
E)  I, II, III, and IV

Question 18

Which of the following substances is the reducing agent in the chemical reaction ?
​
Fe2O3 + 3CO → 2Fe + CO2

Accepted Answer

A)  Fe2O3 
B)  CO 
C)  2Fe 
D)  C 
E)  O2 
A)  Fe2O3 
B)  CO 
C)  2Fe 
D)  C 
E)  O2

Question 19

Rust formation is accelerated in the presence of salt water because_____.

Accepted Answer

A)  oxygen is easily transported in water 
B)  salt water traps the oxygen at the surface of the metal 
C)  salt water conducts electricity 
D)  chloride ions also oxidize the surface of the metal 
E)  salt water contains a higher amount of oxygen than normal water 
A)  oxygen is easily transported in water 
B)  salt water traps the oxygen at the surface of the metal 
C)  salt water conducts electricity 
D)  chloride ions also oxidize the surface of the metal 
E)  salt water contains a higher amount of oxygen than normal water

Question 20

Which substance is the oxidizing agent in this redox reaction? Br − (aq) + MnO4 − (aq) → Br2(l) + Mn2+(aq)

Accepted Answer

A)  Br  −  
B)  MnO4 −  
C)  Br2 
D)  Mn2+ 
E)  None of these 
A)  Br  −  
B)  MnO4 −  
C)  Br2 
D)  Mn2+ 
E)  None of these

Atoms or molecules with unpaired electrons are called _____.

Which of these occurs(s) during reduction?

_____ is used as a coating in the galvanization process.

Which substance is reduced in this redox equation? HF + Cl₂ → F₂ + HCl

Identify a true statement about photosynthesis.

The most common method used to protect underground pipes from rusting is _____.

Redox reactions involve the transfer of _____.

Which of these substances is the most common oxidizing agent?

Which of these is/are oxidation-reduction reaction(s)? I. PCl₃ + 3H₂O → 3HCl + H₃PO₃ II. Fe₂O₃ + 3CO → 2Fe + 3CO₂ III. CaCO₃ + HClO₃ → Ca(ClO₃)₂ + CO₂ + H₂O

Which of these is a possible anodic reaction that occurs during the corrosion of iron?

Which of the following is true of fuel cells?

Which of these methods is/are utilized to help prevent the rusting of iron? I. Painting iron II. Treating iron with sulfuric acid III. Coating iron with a metal that is more likely to oxidize

Which of these are the primary components in an automobile battery?

Which of these statements about redox reactions is incorrect ?

Which of these occur(s) during oxidation?

Which substance is the reducing agent in this redox equation? HF + Cl₂ → F₂ + HCl

Which of these are oxidation-reduction reactions? I. 3H₂ + N₂ → 2NH₃ II. Cu₂O + C → 2Cu + CO III. Fe₂O₃ + 3CO → 2Fe + CO₂ IV. 2K + Br₂ → 2KBr

Which of the following substances is the reducing agent in the chemical reaction ? Fe₂O₃ + 3CO → 2Fe + CO₂

Rust formation is accelerated in the presence of salt water because_____.

Which substance is the oxidizing agent in this redox reaction? Br⁻(aq) + MnO₄⁻(aq) → Br₂(l) + Mn²⁺(aq)

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Exam 14: Oxidation and Reduction

Atoms or molecules with unpaired electrons are called _____.

Which of these occurs(s) during reduction?

_____ is used as a coating in the galvanization process.

Which substance is reduced in this redox equation? HF + Cl2 → F2 + HCl

Identify a true statement about photosynthesis.

The most common method used to protect underground pipes from rusting is _____.

Redox reactions involve the transfer of _____.

Which of these substances is the most common oxidizing agent?

Which of these is/are oxidation-reduction reaction(s)? I. PCl3 + 3H2O → 3HCl + H3PO3 II. Fe2O3 + 3CO → 2Fe + 3CO2 III. CaCO3 + HClO3 → Ca(ClO3)2 + CO2 + H2O

Which of these is a possible anodic reaction that occurs during the corrosion of iron?

Which of the following is true of fuel cells?

Which of these methods is/are utilized to help prevent the rusting of iron? I. Painting iron II. Treating iron with sulfuric acid III. Coating iron with a metal that is more likely to oxidize

Which of these are the primary components in an automobile battery?

Which of these statements about redox reactions is incorrect ?

Which of these occur(s) during oxidation?

Which substance is the reducing agent in this redox equation? HF + Cl2 → F2 + HCl

Which of these are oxidation-reduction reactions? I. 3H2 + N2 → 2NH3 II. Cu2O + C → 2Cu + CO III. Fe2O3 + 3CO → 2Fe + CO2 IV. 2K + Br2 → 2KBr

Which of the following substances is the reducing agent in the chemical reaction ? ​ Fe2O3 + 3CO → 2Fe + CO2

Rust formation is accelerated in the presence of salt water because_____.

Which substance is the oxidizing agent in this redox reaction? Br − (aq) + MnO4 − (aq) → Br2(l) + Mn2+(aq)

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The Chemists Toolbox

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Molecules, Compounds, and Chemical Reactions

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The Liquids and Solids Around Us: Especially Water

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The Chemistry of Food

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Which substance is reduced in this redox equation? HF + Cl₂ → F₂ + HCl

Which of these is/are oxidation-reduction reaction(s)? I. PCl₃ + 3H₂O → 3HCl + H₃PO₃ II. Fe₂O₃ + 3CO → 2Fe + 3CO₂ III. CaCO₃ + HClO₃ → Ca(ClO₃)₂ + CO₂ + H₂O

Which substance is the reducing agent in this redox equation? HF + Cl₂ → F₂ + HCl

Which of these are oxidation-reduction reactions? I. 3H₂ + N₂ → 2NH₃ II. Cu₂O + C → 2Cu + CO III. Fe₂O₃ + 3CO → 2Fe + CO₂ IV. 2K + Br₂ → 2KBr

Which of the following substances is the reducing agent in the chemical reaction ? Fe₂O₃ + 3CO → 2Fe + CO₂

Which substance is the oxidizing agent in this redox reaction? Br⁻(aq) + MnO₄⁻(aq) → Br₂(l) + Mn²⁺(aq)