Deck 4: Molecular Interactions: Holding It All Together

Question 1

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.

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

Answer 1

A,D,E

Question 2

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

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.

Answer 2

A,B,C,E

Question 3

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

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

Answer 3

B

Question 4

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

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

Question 5

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

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 6

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

A)
B)
C)
D)
E)

Question 7

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

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

Question 8

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

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

Question 9

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

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 10

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.

Question 11

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

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 12

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

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

Question 13

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

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.

Question 14

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

Question 15

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

A) X
B) Y