Question 1

Which of the following best explains why water (H$_2$O) has a much higher boiling point than expected compared to other group 16 hydrides?

Accepted Answer

Water molecules form strong hydrogen bonds due to the high electronegativity of oxygen.

Question 2

Which intermolecular force is primarily responsible for the non-ideal behavior of real gases at high pressures and low temperatures?

Accepted Answer

Van der Waals forces

Question 3

A molecule of CH$_3$F has a dipole moment of $\mu = 1.65 	imes 10^{-30}$ C·m. What type of intermolecular force is most significant between CH$_3$F molecules?

Accepted Answer

Dipole-dipole interactions

Question 4

Which statement best describes London dispersion forces?

Accepted Answer

They arise from temporary shifts in electron density, creating instantaneous dipoles even in nonpolar molecules.

Question 5

Why do larger halogen atoms (e.g., I$_2$) have higher boiling points than smaller ones (e.g., F$_2$)?

Accepted Answer

Larger atoms have more electrons, leading to greater polarizability and stronger London dispersion forces.

Question 6

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

NH$_3$

Question 7

A protein's structure is stabilized by various intermolecular forces. Which force is most critical for the formation of alpha helices and beta sheets in proteins?

Accepted Answer

Hydrogen bonding

Question 8

Which property increases as the polarizability ($\alpha$) of a molecule increases?

Accepted Answer

Boiling point

Question 9

Which of the following best describes a dipole-induced dipole interaction?

Accepted Answer

A polar molecule induces a dipole in a neighboring nonpolar molecule.

Question 10

Which intermolecular force is responsible for the ability of gecko feet to adhere to surfaces?

Accepted Answer

London dispersion forces

Question 11

Consider the boiling points of the hydrides NH$_3$, H$_2$O, and HF. Why are their boiling points much higher than expected based on molecular mass?

Accepted Answer

They all exhibit strong hydrogen bonding due to highly electronegative atoms bonded to hydrogen.

Question 12

Which of the following statements about van der Waals forces is correct?

Accepted Answer

They include dipole-dipole, dipole-induced dipole, and London dispersion forces.

Question 13

A chemist is separating a mixture using gas chromatography. Which property of the molecules is most important for their separation in this technique?

Accepted Answer

Intermolecular forces such as dipole moment and polarizability

Question 14

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

Accepted Answer

He

Question 15

Which intermolecular force is present in all substances, regardless of polarity?

Accepted Answer

London dispersion forces

Question 16

Which of the following best explains why superhydrophobic surfaces repel water?

Accepted Answer

They minimize attractive intermolecular forces between water and the surface.

Question 17

Which of the following is NOT a consequence of strong intermolecular forces in a liquid?

Accepted Answer

Lower density

Question 18

Which of the following molecules can participate in intermolecular hydrogen bonding?

Accepted Answer

HF

Question 19

A nonpolar molecule is placed near a polar molecule. What type of interaction is most likely to occur?

Accepted Answer

Dipole-induced dipole interaction

Question 20

Which of the following best describes the relationship between molecular shape and intermolecular forces?

Accepted Answer

Molecular shape affects the distribution of electron density, influencing dipole moment and polarizability.

Intermolecular Forces: Types, Properties, and Applications

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