Question 1

Which of the following best explains why a gas has no definite volume or shape?

Accepted Answer

The particles in a gas are widely separated and forces of attraction are essentially nonexistent.

Question 2

Which type of intermolecular force is primarily responsible for the high boiling point of water ($$H_2O$$)?

Accepted Answer

Hydrogen bonds

Question 3

A sample of $$NaCl is $$dissolved in water. What is the strongest type of intermolecular force present between the ions and water molecules?

Accepted Answer

Ion-dipole forces

Question 4

Which of the following molecules exhibits dipole-dipole forces in pure samples?

Accepted Answer

CO

Question 5

Which of the following molecules can form hydrogen bonds in pure samples?

Accepted Answer

HF

Question 6

Rank the following compounds according to increasing boiling point: $$CO_2$$, $$H_2O$$, and $$SO_2.$$

Accepted Answer

$$CO_2$$ \u003c $$SO_2$$ \u003c H_2O$$

Question 7

Which statement correctly describes the relationship between polarizability and London dispersion force strength?

Accepted Answer

London dispersion force strength increases as polarizability increases.

Question 8

Which of the following correctly ranks the intermolecular forces from strongest to weakest?

Accepted Answer

Ion-dipole \u003e Hydrogen bond \u003e Dipole-dipole \u003e London dispersion

Question 9

Which of the following best describes why $$Br_2$$ has stronger London dispersion forces than $$F_2$$?

Accepted Answer

$$Br_2$$ has a higher molar mass and greater polarizability than $$F_2.$$

Question 10

Which of the following is a real-world example of a hydrogen bond's importance?

Accepted Answer

The double helix structure of DNA is stabilized by hydrogen bonds between base pairs.

Question 11

Which of the following statements is true regarding the physical properties of substances?

Accepted Answer

Intermolecular forces influence the physical properties such as boiling and melting points.

Question 12

A liquid has a definite volume but no definite shape. What does this indicate about the forces between its particles?

Accepted Answer

The particles are held close together by intermolecular forces but can move past one another.

Question 13

Which of the following molecules would you expect to have the lowest boiling point?

Accepted Answer

$$O_2$$

Question 14

Which intermolecular force is present in all atoms and molecules, regardless of their polarity?

Accepted Answer

London dispersion forces

Question 15

Which of the following best describes the competition that determines a substance's state of matter?

Accepted Answer

The competition between the force of attraction between particles and the kinetic energy (temperature) of the particles.

Question 16

Which of the following molecules is most likely to exhibit only London dispersion forces in a pure sample?

Accepted Answer

$$CO_2$$

Question 17

Which of the following correctly ranks $$I_2$$, $$F_2$$, and $$Br_2$$ according to increasing London dispersion force strength?

Accepted Answer

$$F_2$$ \u003c $$Br_2$$ \u003c $$I_2$$

Question 18

Which of the following statements about hydrogen bonds is FALSE?

Accepted Answer

Hydrogen bonds are stronger than ion-dipole forces.

Question 19

Which intermolecular force is responsible for the solubility of ionic compounds in polar solvents?

Accepted Answer

Ion-dipole forces

Question 20

Which of the following best explains why $$NH_3$$ has a higher boiling point than $$O_2$$?

Accepted Answer

$$NH_3$$ molecules form hydrogen bonds, while $$O_2$$ molecules only exhibit London dispersion forces.

Intermolecular Forces and States of Matter

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