Question 1

Which of the following best explains why HCl(g) requires much less energy to convert to HCl(l) than to break it into H and Cl atoms?

Accepted Answer

Intermolecular forces are much weaker than intramolecular forces.

Question 2

Which of the following statements about dispersion (London) forces is correct?

Accepted Answer

Dispersion forces are present between all molecules and atoms.

Question 3

Which of the following substances would you expect to have the highest boiling point, based on intermolecular forces?

Accepted Answer

HF

Question 4

What is the main factor that determines whether a substance is a solid, liquid, or gas according to kinetic molecular theory?

Accepted Answer

The balance between kinetic energy and interparticle energies of attraction.

Question 5

Which of the following intermolecular forces is generally the strongest?

Accepted Answer

Ion-dipole

Question 6

Why does water (H$$_2O) $$have a much higher boiling point than hydrogen sulfide (H$$_2S$$)?

Accepted Answer

Water forms hydrogen bonds, which are much stronger than the dipole-dipole forces in H$$_2S.$$

Question 7

Which equation correctly represents the energy of interaction between two charged particles?

Accepted Answer

$$E = \frac{q_1$ q_2$}{4 \pi \$$varepsilon_0$$ r}$$

Question 8

Which property is most directly affected by the strength of intermolecular forces in a liquid?

Accepted Answer

Boiling point

Question 9

Which of the following best describes hydrogen bonding?

Accepted Answer

A special type of dipole-dipole attraction involving H bonded to F, O, or N.

Question 10

Which of the following would increase the strength of dispersion forces in a molecule?

Accepted Answer

Increasing the number of electrons in the molecule.

Question 11

Which of the following is true about the melting of a substance?

Accepted Answer

Intermolecular forces are broken, but intramolecular forces remain intact.

Question 12

Which of the following best explains why pentane has a higher boiling point than 2,2-dimethylpropane?

Accepted Answer

Pentane has a larger area of contact, leading to stronger dispersion forces.

Question 13

Which intermolecular force is most important in a solution of NaCl in water?

Accepted Answer

Ion-dipole

Question 14

Which of the following statements about intermolecular forces is FALSE?

Accepted Answer

Dipole-dipole forces are found in all molecules.

Question 15

Which of the following would have the weakest intermolecular forces?

Accepted Answer

He

Question 16

Which of the following is a property of liquids but not gases?

Accepted Answer

Definite volume

Question 17

Which of the following best describes the effect of temperature on kinetic energy and intermolecular forces?

Accepted Answer

Increasing temperature increases kinetic energy, which works to keep particles apart.

Question 18

Which of the following is NOT a type of intermolecular force?

Accepted Answer

Covalent bond

Question 19

Which of the following factors does NOT increase the magnitude of ion-dipole forces?

Accepted Answer

Decreasing the charge on the ion

Question 20

Which of the following best describes the relationship between molecular polarity and the strength of dipole-dipole forces?

Accepted Answer

For molecules of similar size, greater polarity leads to stronger dipole-dipole forces.

Liquids, Solids, and Intermolecular Forces (General Chemistry I, Chapter 11)

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