Question 1

Which of the following best explains why water forms a near perfect sphere in the space station?

Accepted Answer

Intermolecular forces cause water molecules to attract each other, minimizing surface area.

Question 2

Which statement correctly compares the densities of ice, liquid water, and steam at 0°C and 100°C?

Accepted Answer

Liquid water is denser than ice at 0°C.

Question 3

Why does ice float on liquid water?

Accepted Answer

Hydrogen bonding in ice creates an open, ordered structure, making it less dense than liquid water.

Question 4

Which property is NOT characteristic of solids?

Accepted Answer

Particles can easily flow past each other.

Question 5

Which of the following best describes the compressibility of gases compared to liquids?

Accepted Answer

Gases are highly compressible due to large distances between molecules.

Question 6

Which of the following is an example of a crystalline solid?

Accepted Answer

Salt

Question 7

What phase change occurs when a solid is heated and its particles gain enough energy to move freely?

Accepted Answer

Melting (fusion)

Question 8

When a liquefied propane tank is opened, some propane escapes as gas. What effect does this have on the pressure inside the tank?

Accepted Answer

The pressure inside the tank decreases.

Question 9

Which statement about intermolecular forces is correct?

Accepted Answer

The stronger the intermolecular forces, the higher the boiling and melting points.

Question 10

Which of the following is the weakest type of intermolecular force?

Accepted Answer

London dispersion forces

Question 11

Dispersion forces (London forces) are present in:

Accepted Answer

All molecules and atoms

Question 12

Which factor increases the strength of London dispersion forces?

Accepted Answer

Increasing molar mass

Question 13

How does the shape of a molecule affect its dispersion forces?

Accepted Answer

Long, thin molecules have stronger dispersion forces due to increased surface area.

Question 14

Which molecule is most likely to have dipole-dipole interactions?

Accepted Answer

SO$_2$

Question 15

Which of the following molecules can form hydrogen bonds?

Accepted Answer

NH$_3$

Question 16

Which statement best describes the relationship between dipole moment and boiling point?

Accepted Answer

Boiling point increases as dipole moment increases.

Question 17

Which orientation is most likely for two acetonitrile (CH$_3$CN) molecules interacting with each other?

Accepted Answer

The negative end of one molecule aligns with the positive end of another.

Question 18

Which statement about solubility is correct?

Accepted Answer

Polar substances dissolve best in polar solvents.

Question 19

Why are pentane and water immiscible?

Accepted Answer

The attractive forces among water molecules are much stronger than their attractions for pentane molecules.

Question 20

Which of the following is true about hydrogen bonding?

Accepted Answer

Hydrogen bonds occur when H is bonded to F, O, or N.

Liquids, Solids, and Intermolecular Forces: Structured Study Notes

Study Guide - Practice Questions