Question 1

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

Accepted Answer

A)  Hydrogen bonds operate between amino acid side chains in a polypeptide. 
B)  Hydrogen bonds operate between neighbouring phosphate groups along the backbone of a DNA strand. 
C)  Hydrogen bonds operate between different regions of the peptide backbone in a polypeptide. 
D)  Hydrogen bonds do not operate between different regions of an RNA molecule. 
E)  Hydrogen bonds may operate between the bases of neighbouring DNA strands. 
A)  Hydrogen bonds operate between amino acid side chains in a polypeptide. 
B)  Hydrogen bonds operate between neighbouring phosphate groups along the backbone of a DNA strand. 
C)  Hydrogen bonds operate between different regions of the peptide backbone in a polypeptide. 
D)  Hydrogen bonds do not operate between different regions of an RNA molecule. 
E)  Hydrogen bonds may operate between the bases of neighbouring DNA strands. A,C,E

Question 2

Look at this figure of a hydrogen bond. Which entity - X or Y - is acting as the hydrogen bond donor?

Accepted Answer

A)  X 
B)  Y 
A)  X 
B)  Y B

Question 3

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

Accepted Answer

A)  Dispersion forces are very short-lived 
B)  Dispersion forces stabilize hydrophobic interactions. 
C)  Dispersion forces operate over only very short distances. 
D)  Dispersion forces can only exist between polar molecules. 
E)  Dispersion forces are the weakest non-covalent interaction. 
A)  Dispersion forces are very short-lived 
B)  Dispersion forces stabilize hydrophobic interactions. 
C)  Dispersion forces operate over only very short distances. 
D)  Dispersion forces can only exist between polar molecules. 
E)  Dispersion forces are the weakest non-covalent interaction. A,B,C,E

Question 4

Non-covalent interactions are more sensitive to an increase in temperature than covalent interactions.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A)  Polar molecules are hydrophilic. 
B)  Polar molecules have lower melting and boiling points than non-polar molecules. 
C)  Polar molecules experience more non-covalent forces than non-polar molecules. 
D)  Polar molecules exhibit an uneven distribution of electrons. 
E)  Polar molecules do not experience dipolar interactions. 
A)  Polar molecules are hydrophilic. 
B)  Polar molecules have lower melting and boiling points than non-polar molecules. 
C)  Polar molecules experience more non-covalent forces than non-polar molecules. 
D)  Polar molecules exhibit an uneven distribution of electrons. 
E)  Polar molecules do not experience dipolar interactions.

Question 6

Which of the following is the name given to the molecular force that operates between oppositely-charged amino acid side chains in a protein?

Accepted Answer

A)  van der Waals interaction 
B)  Ionic bond 
C)  Salt bridge 
D)  Dispersion force 
E)  Peptide bond 
A)  van der Waals interaction 
B)  Ionic bond 
C)  Salt bridge 
D)  Dispersion force 
E)  Peptide bond

Question 7

Which three of the following elements is H most likely to be attached to for it to participate in a hydrogen bond? Select the three that apply.

Accepted Answer

A)  N 
B)  I 
C)  Br 
D)  O 
E)  F 
A)  N 
B)  I 
C)  Br 
D)  O 
E)  F

Question 8

Hydrogen bonds are an example of which of the following types of molecular interaction?

Accepted Answer

A)  Salt bridge 
B)  Ionic force 
C)  Dispersion force 
D)  Permanent dipolar interaction 
E)  Covalent bond 
A)  Salt bridge 
B)  Ionic force 
C)  Dispersion force 
D)  Permanent dipolar interaction 
E)  Covalent bond

Question 9

Which of the following molecules are polar? Select all that apply.

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 10

Which of the following statements about non-covalent interactions are false? Select all that apply.

Accepted Answer

A)  Non-covalent interactions only operate between separate molecules. 
B)  Non-covalent interactions are primarily electrostatic in nature. 
C)  Non-covalent interactions only operate over short distances. 
D)  The weakest non-covalent interaction is the ionic force. 
E)  The strength of a non-covalent interaction increases as the distance between two molecules increases 
A)  Non-covalent interactions only operate between separate molecules. 
B)  Non-covalent interactions are primarily electrostatic in nature. 
C)  Non-covalent interactions only operate over short distances. 
D)  The weakest non-covalent interaction is the ionic force. 
E)  The strength of a non-covalent interaction increases as the distance between two molecules increases

Question 11

Rank the following physical phases in order of the extent of the non-covalent forces they feature, with 1 being the greatest and 3 being the lowest.

Accepted Answer

a. Gas = 3

Question 12

Match the following descriptions with the names of the physical processes they represent.
-The transition from solid to gas

Accepted Answer

A)  Condensation 
B)  Melting 
C)  Solidification 
D)  Sublimation 
E)  Vaporization 
A)  Condensation 
B)  Melting 
C)  Solidification 
D)  Sublimation 
E)  Vaporization

Question 13

Which of the following are characteristic of non-polar molecules? Select all that apply.

Accepted Answer

A)  They do not experience dispersion forces. 
B)  They have relatively low melting and boiling points. 
C)  Their electrons are distributed unevenly. 
D)  They are hydrophobic. 
E)  They never contain polar bonds. 
A)  They do not experience dispersion forces. 
B)  They have relatively low melting and boiling points. 
C)  Their electrons are distributed unevenly. 
D)  They are hydrophobic. 
E)  They never contain polar bonds.

Question 14

Match the following descriptions with the names of the physical processes they represent.
-The transition from solid to liquid

Accepted Answer

A)  Condensation 
B)  Melting 
C)  Solidification 
D)  Sublimation 
E)  Vaporization 
A)  Condensation 
B)  Melting 
C)  Solidification 
D)  Sublimation 
E)  Vaporization

Question 15

Which of the following does not contribute to the van der Waals interaction?

Accepted Answer

A)  Hydrogen bond 
B)  Dispersion force 
C)  Steric repulsion 
D)  Permanent dipolar interaction 
A)  Hydrogen bond 
B)  Dispersion force 
C)  Steric repulsion 
D)  Permanent dipolar interaction

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

Look at this figure of a hydrogen bond. Which entity - X or Y - is acting as the hydrogen bond donor?

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

Non-covalent interactions are more sensitive to an increase in temperature than covalent interactions.

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

Which of the following is the name given to the molecular force that operates between oppositely-charged amino acid side chains in a protein?

Which three of the following elements is H most likely to be attached to for it to participate in a hydrogen bond? Select the three that apply.

Hydrogen bonds are an example of which of the following types of molecular interaction?

Which of the following molecules are polar? Select all that apply.

Which of the following statements about non-covalent interactions are false? Select all that apply.

Rank the following physical phases in order of the extent of the non-covalent forces they feature, with 1 being the greatest and 3 being the lowest.

Match the following descriptions with the names of the physical processes they represent. -The transition from solid to gas

Which of the following are characteristic of non-polar molecules? Select all that apply.

Match the following descriptions with the names of the physical processes they represent. -The transition from solid to liquid

Which of the following does not contribute to the van der Waals interaction?

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

Chemical Reactions, Oxidation, and Reduction: Bringing Molecules to 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

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

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Exam 4: Molecular Interactions: Holding It All Together

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

Look at this figure of a hydrogen bond. Which entity - X or Y - is acting as the hydrogen bond donor?

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

Non-covalent interactions are more sensitive to an increase in temperature than covalent interactions.

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

Which of the following is the name given to the molecular force that operates between oppositely-charged amino acid side chains in a protein?

Which three of the following elements is H most likely to be attached to for it to participate in a hydrogen bond? Select the three that apply.

Hydrogen bonds are an example of which of the following types of molecular interaction?

Which of the following molecules are polar? Select all that apply.

Which of the following statements about non-covalent interactions are false? Select all that apply.

Rank the following physical phases in order of the extent of the non-covalent forces they feature, with 1 being the greatest and 3 being the lowest.

Match the following descriptions with the names of the physical processes they represent. -The transition from solid to gas

Which of the following are characteristic of non-polar molecules? Select all that apply.

Match the following descriptions with the names of the physical processes they represent. -The transition from solid to liquid

Which of the following does not contribute to the van der Waals interaction?

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

Chemical Reactions, Oxidation, and Reduction: Bringing Molecules to 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

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

Filters