Question 1

The cleavage of the H-Br bond is most likely to generate which of the following pairs of species?

Accepted Answer

A)  H+ and Br- 
B)  H- and Br+ 
C)  HF1F1F1S1F1F1F10 and BrF1F1F1S1F1F1F10 
A)  H+ and Br- 
B)  H- and Br+ 
C)  HF1F1F1S1F1F1F10 and BrF1F1F1S1F1F1F10 A

Question 2

Match the correct terms with the following descriptions.
-A loss of electrons during the course of a reaction

Accepted Answer

A)  Oxidation 
B)  Reduction 
A)  Oxidation 
B)  Reduction A

Question 3

Match the correct terms with the following descriptions.
-A gain of electrons during the course of a reaction

Accepted Answer

A)  Oxidation 
B)  Reduction 
A)  Oxidation 
B)  Reduction B

Question 4

Which of the following statements about valence electrons are false? Select all that apply.

Accepted Answer

A)  When heterolytic cleavage occurs, a pair of valence electrons is distributed unequally between two atoms. 
B)  We use a curly arrow to denote the movement of a pair of valence electrons. 
C)  The movement of valence electrons during a chemical reaction is random. 
D)  During a chemical reaction, valence electrons can move both within and between molecules. 
E)  The movement of valence electrons during a chemical reaction is described by the reaction scheme. 
A)  When heterolytic cleavage occurs, a pair of valence electrons is distributed unequally between two atoms. 
B)  We use a curly arrow to denote the movement of a pair of valence electrons. 
C)  The movement of valence electrons during a chemical reaction is random. 
D)  During a chemical reaction, valence electrons can move both within and between molecules. 
E)  The movement of valence electrons during a chemical reaction is described by the reaction scheme.

Question 5

Which of the following statements about chemical reactions are true? Select all that apply.

Accepted Answer

A)  Chemical reactions involve the breaking of bonds between atoms in molecules, and the formation of new bonds between different groups of atoms. 
B)  During chemical reactions, valence electrons always move as pairs. 
C)  The reactants associated with a particular reaction react in different relative quantities depending on the temperature at which the reaction is being performed. 
D)  Chemical reactions always result in full valence shells being maintained. 
E)  Chemical reactions require the movement of valence electrons. 
A)  Chemical reactions involve the breaking of bonds between atoms in molecules, and the formation of new bonds between different groups of atoms. 
B)  During chemical reactions, valence electrons always move as pairs. 
C)  The reactants associated with a particular reaction react in different relative quantities depending on the temperature at which the reaction is being performed. 
D)  Chemical reactions always result in full valence shells being maintained. 
E)  Chemical reactions require the movement of valence electrons.

Question 6

Which of the following species behave as electrophiles? Select all that apply.

Accepted Answer

A)  CN- 
B)  CH3CH2+ 
C)  H+ 
D)  H2O 
E)  CHCH 
A)  CN- 
B)  CH3CH2+ 
C)  H+ 
D)  H2O 
E)  CHCH

Question 7

The following reaction represents which stage in a free-radical reaction?

Accepted Answer

A)  Initiation 
B)  Propagation 
C)  Termination 
A)  Initiation 
B)  Propagation 
C)  Termination

Question 8

Which of the following statements are true? Select all that apply.

Accepted Answer

A)  An electrophile must possess a partially empty orbital. 
B)  A nucleophile must be able to donate a pair of valence electrons. 
C)  A non-bonding pair is not a suitable valence pair for a nucleophile to donate. 
D)  When a nucleophile donates a pair of valence electrons to an electrophile, an ionic bond is formed. 
E)  A double bond can act as a nucleophile. 
A)  An electrophile must possess a partially empty orbital. 
B)  A nucleophile must be able to donate a pair of valence electrons. 
C)  A non-bonding pair is not a suitable valence pair for a nucleophile to donate. 
D)  When a nucleophile donates a pair of valence electrons to an electrophile, an ionic bond is formed. 
E)  A double bond can act as a nucleophile.

Question 9

Electromagnetic radiation in which of the following regions of the electromagnetic spectrum is most able to generate free radicals?

Accepted Answer

A)  Radio wave 
B)  Cosmic wave 
C)  Infrared 
D)  Visible 
E)  Ultraviolet 
A)  Radio wave 
B)  Cosmic wave 
C)  Infrared 
D)  Visible 
E)  Ultraviolet

Question 10

Which of the following species behave as nucleophiles? Select all that apply.

Accepted Answer

A)  Cl- 
B)  H+ 
C)  OH 
D)  CH2CH2 
E)  NO2+ 
A)  Cl- 
B)  H+ 
C)  OH 
D)  CH2CH2 
E)  NO2+

Question 11

Which of the following bonds are most likely to break homolytically? Select any that apply.

Accepted Answer

A)  H-Br 
B)  Cl-Cl 
C)  C-H 
D)  C-C 
E)  O-H 
A)  H-Br 
B)  Cl-Cl 
C)  C-H 
D)  C-C 
E)  O-H

Question 12

The stoichiometry of a reaction tells us which of the following?

Accepted Answer

A)  The rate at which a reaction occurs. 
B)  The amount of energy liberated during the course of a reaction. 
C)  The number of steps from which an overall reaction, from reactants to products, is formed. 
D)  The amount of energy required to initiate a reaction. 
E)  The relative quantities of reactants and products associated with a particular reaction. 
A)  The rate at which a reaction occurs. 
B)  The amount of energy liberated during the course of a reaction. 
C)  The number of steps from which an overall reaction, from reactants to products, is formed. 
D)  The amount of energy required to initiate a reaction. 
E)  The relative quantities of reactants and products associated with a particular reaction.

Question 13

Based on the following standard reduction potentials, which of the following species acts as the strongest oxidizing agent?
Zn2+(aq) + 2e- ⇌ Zn(s); E° = -0.34v
Cl2(g) + 2e- ⇌ 2Cl-(aq); E° = 1.36v
Ca2+(aq) + 2e- ⇌ Ca(s); E° = -2.87v
2H+(aq) + 2e- ⇌ H2(g); E° = 0.00v

Accepted Answer

A)  Zn2+(aq) 
B)  Cl2(g) 
C)  Ca2+(aq) 
D)  2H+(aq) 
A)  Zn2+(aq) 
B)  Cl2(g) 
C)  Ca2+(aq) 
D)  2H+(aq)

Question 14

During the course of a reaction, the oxidation number of oxygen increases from -2 to 0. Is oxygen being oxidized or reduced during this reaction?

Accepted Answer

A)  Oxidized 
B)  Reduced 
A)  Oxidized 
B)  Reduced

Question 15

Which of the following statements regarding free radicals are true? Select all that apply.

Accepted Answer

A)  Antioxidants catalyse free radical reactions by encouraging the formation of free radicals. 
B)  A chain reaction involves a sequence of linked propagation reactions. 
C)  Free-radical reactions involve heterolytic bond cleavage. 
D)  Free radicals can only be generated from molecules possessing non-polar bonds. 
E)  The initiation of a free-radical reaction by ultraviolet light is called photolysis. 
A)  Antioxidants catalyse free radical reactions by encouraging the formation of free radicals. 
B)  A chain reaction involves a sequence of linked propagation reactions. 
C)  Free-radical reactions involve heterolytic bond cleavage. 
D)  Free radicals can only be generated from molecules possessing non-polar bonds. 
E)  The initiation of a free-radical reaction by ultraviolet light is called photolysis.

Question 16

The reference electrode against which other standard reduction potentials are measured is which of the following?

Accepted Answer

A)  The platinum electrode 
B)  The iron electrode 
C)  The copper electrode 
D)  The zinc electrode 
E)  The hydrogen electrode 
A)  The platinum electrode 
B)  The iron electrode 
C)  The copper electrode 
D)  The zinc electrode 
E)  The hydrogen electrode

Question 17

When we forcibly increase the proportion of free radicals entering the termination step of a free-radical reaction we are said to be doing what?

Accepted Answer

A)  Extinguishing the reaction 
B)  Terminating the reaction 
C)  Quenching the reaction 
D)  Exhausting the reaction 
E)  Expunging the reaction 
A)  Extinguishing the reaction 
B)  Terminating the reaction 
C)  Quenching the reaction 
D)  Exhausting the reaction 
E)  Expunging the reaction

Question 18

During the process NADH → NAD+ the electron carrier NAD is being reduced.

Accepted Answer

A) True 
 B)False

The cleavage of the H-Br bond is most likely to generate which of the following pairs of species?

Match the correct terms with the following descriptions. -A loss of electrons during the course of a reaction

Match the correct terms with the following descriptions. -A gain of electrons during the course of a reaction

Which of the following statements about valence electrons are false? Select all that apply.

Which of the following statements about chemical reactions are true? Select all that apply.

Which of the following species behave as electrophiles? Select all that apply.

The following reaction represents which stage in a free-radical reaction?

Which of the following statements are true? Select all that apply.

Electromagnetic radiation in which of the following regions of the electromagnetic spectrum is most able to generate free radicals?

Which of the following species behave as nucleophiles? Select all that apply.

Which of the following bonds are most likely to break homolytically? Select any that apply.

The stoichiometry of a reaction tells us which of the following?

Based on the following standard reduction potentials, which of the following species acts as the strongest oxidizing agent? Zn²⁺(aq)+ 2e^- ⇌ Zn(s)_;E° = -0.34v Cl2(g)+ 2e^- ⇌ 2Cl-(aq); E° = 1.36v Ca²⁺(aq)+ 2e^- ⇌ Ca(s); E° = -2.87v 2H⁺(aq)+ 2e^- ⇌ H2(g); E° = 0.00v

During the course of a reaction, the oxidation number of oxygen increases from -2 to 0. Is oxygen being oxidized or reduced during this reaction?

Which of the following statements regarding free radicals are true? Select all that apply.

The reference electrode against which other standard reduction potentials are measured is which of the following?

When we forcibly increase the proportion of free radicals entering the termination step of a free-radical reaction we are said to be doing what?

During the process NADH → NAD⁺ the electron carrier NAD is being reduced.

Chemical Analysis: Characterizing Chemical Compounds

Acids, Bases, and Buffer Solutions: Life in an Aqueous Environment

Kinetics: What Affects the Speed of a Reaction

Equilibria: How Far Do Reactions Go

Energy: What Makes Reactions Go

Reaction Mechanisms: The Chemical Changes That Drive the Chemistry of Life

Metals in Biology: Life Beyond Carbon

Biological Macromolecules: The Infrastructure of Life

Isomerism: Generating Chemical Variety

Molecular Shape and Structure: Life in Three Dimensions

Functional Groups: Adding Function to the Framework of Life

Hydrocarbons: The Framework of Life

Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers

Molecular Interactions: Holding It All Together

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

Filters

Exam 12: Chemical Reactions, Oxidation, and Reduction: Bringing Molecules to Life

The cleavage of the H-Br bond is most likely to generate which of the following pairs of species?

Match the correct terms with the following descriptions. -A loss of electrons during the course of a reaction

Match the correct terms with the following descriptions. -A gain of electrons during the course of a reaction

Which of the following statements about valence electrons are false? Select all that apply.

Which of the following statements about chemical reactions are true? Select all that apply.

Which of the following species behave as electrophiles? Select all that apply.

The following reaction represents which stage in a free-radical reaction?

Which of the following statements are true? Select all that apply.

Electromagnetic radiation in which of the following regions of the electromagnetic spectrum is most able to generate free radicals?

Which of the following species behave as nucleophiles? Select all that apply.

Which of the following bonds are most likely to break homolytically? Select any that apply.

The stoichiometry of a reaction tells us which of the following?

Based on the following standard reduction potentials, which of the following species acts as the strongest oxidizing agent? Zn2+(aq) + 2e- ⇌ Zn(s); E° = -0.34v Cl2(g) + 2e- ⇌ 2Cl-(aq); E° = 1.36v Ca2+(aq) + 2e- ⇌ Ca(s); E° = -2.87v 2H+(aq) + 2e- ⇌ H2(g); E° = 0.00v

During the course of a reaction, the oxidation number of oxygen increases from -2 to 0. Is oxygen being oxidized or reduced during this reaction?

Which of the following statements regarding free radicals are true? Select all that apply.

The reference electrode against which other standard reduction potentials are measured is which of the following?

When we forcibly increase the proportion of free radicals entering the termination step of a free-radical reaction we are said to be doing what?

During the process NADH → NAD+ the electron carrier NAD is being reduced.

Chemical Analysis: Characterizing Chemical Compounds

Acids, Bases, and Buffer Solutions: Life in an Aqueous Environment

Kinetics: What Affects the Speed of a Reaction

Equilibria: How Far Do Reactions Go

Energy: What Makes Reactions Go

Reaction Mechanisms: The Chemical Changes That Drive the Chemistry of Life

Metals in Biology: Life Beyond Carbon

Biological Macromolecules: The Infrastructure of Life

Isomerism: Generating Chemical Variety

Molecular Shape and Structure: Life in Three Dimensions

Functional Groups: Adding Function to the Framework of Life

Hydrocarbons: The Framework of Life

Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers

Molecular Interactions: Holding It All Together

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

Filters

Based on the following standard reduction potentials, which of the following species acts as the strongest oxidizing agent? Zn²⁺(aq)+ 2e^- ⇌ Zn(s)_;E° = -0.34v Cl2(g)+ 2e^- ⇌ 2Cl-(aq); E° = 1.36v Ca²⁺(aq)+ 2e^- ⇌ Ca(s); E° = -2.87v 2H⁺(aq)+ 2e^- ⇌ H2(g); E° = 0.00v

During the process NADH → NAD⁺ the electron carrier NAD is being reduced.