Test Bank Docx | Molecular Interactions Holding It All – Ch4

Chapter 4: Molecular interactions: holding it all together

Test Bank

Type: multiple response question

Title: Chapter 04 - Question 01

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

Type: multiple response question

Title: Chapter 04 - Question 02

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.

Type: matching question

Title: Chapter 04 - Question 03

3) Match the following descriptions with the names of the physical processes they represent.

Feedback: Each so-called ‘phase transition’ has its own name. These names are illustrated in Figure 4.27.

a. The transition from gas to liquid = Condensation

b. The transition from solid to liquid = Melting

c. The transition from liquid to solid = Solidification

d. The transition from solid to gas = Sublimation

e. The transition from liquid to gas = Vaporization

Type: multiple response question

Title: Chapter 04 - Question 04

4) 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

Type: multiple response question

Title: Chapter 04 - Question 05

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

a.

b.

c.

d.

e.

Type: multiple choice question

Title: Chapter 04 - Question 06

6) 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

Type: multiple choice question

Title: Chapter 04 - Question 07

7) 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

Type: multiple response question

Title: Chapter 04 - Question 08

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

In contrast to what we might expect, non-polar molecules may contain polar bonds. However, the polar bonds must be arranged symmetrically for the molecule to be non-polar overall, as explained on page 101.

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.

Type: matching question

Title: Chapter 04 - Question 09

9) 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.

Feedback: The general trend is that solids experience non-covalent forces to the greatest extent – the component atoms are held together tightly, which is why the solid is a solid. By contrast, gases experience non-covalent forces to the lowest extent – the component atoms of a gas are held together very weakly.

Page reference: section 4.6, page 127

a. Gas = 3

b. Solid = 1

c. Liquid = 2

Type: multiple response question

Title: Chapter 04 - Question 10

10) 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.

Type: multiple choice question

Title: Chapter 04 - Question 11

11) 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

Type: multiple response question

Title: Chapter 04 - Question 12

12) 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.

Type: true-false

Title: Chapter 04 - Question 13

13) Non-covalent interactions are more sensitive to an increase in temperature than covalent interactions. True or false?

a. True

b. False

Type: multiple choice question

Title: Chapter 04 - Question 14

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

a. X

b. Y