$q = mass \times C_s \times \Delta T$

Question 1

Which of the following best explains why geckos can climb smooth surfaces such as glass?

Accepted Answer

Geckos have millions of tiny hairs that allow close contact, maximizing intermolecular attractive forces.

Question 2

Which phase of water has the lowest density, and why is this significant for life on Earth?

Accepted Answer

Ice; it floats on liquid water, insulating aquatic environments.

Question 3

Which type of molecular motion is present in solids but not in gases?

Accepted Answer

Vibrational freedom

Question 4

According to the kinetic-molecular theory, what two factors determine the state of a material?

Accepted Answer

The amount of kinetic energy and the strength of intermolecular attractions

Question 5

Which equation correctly relates the average kinetic energy of particles to temperature?

Accepted Answer

$KE_{avg} = 1.5kT$

Question 6

Which statement about intermolecular forces is TRUE?

Accepted Answer

Hydrogen bonds are the strongest intermolecular force in pure substances.

Question 7

Which factor increases the strength of dispersion forces in a molecule?

Accepted Answer

Larger electron cloud volume

Question 8

Why do polar molecules generally have higher boiling points than nonpolar molecules of similar size?

Accepted Answer

Polar molecules have stronger dipole-dipole attractions.

Question 9

Which of the following molecules can form hydrogen bonds?

Accepted Answer

NH$_3$

Question 10

A liquid with strong intermolecular forces will have which of the following properties?

Accepted Answer

High surface tension and low vapor pressure

Question 11

Which process is endothermic and requires energy input to occur?

Accepted Answer

Vaporization

Question 12

What is the effect of increasing temperature on the viscosity of a liquid?

Accepted Answer

Viscosity decreases

Question 13

Which equation would you use to calculate the energy required to heat a solid from one temperature to another?

Accepted Answer

$q = mass 	imes C_s 	imes \Delta T$

Question 14

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

Accepted Answer

Ion-dipole forces

Question 15

What happens to the boiling point of a liquid if the external pressure is decreased?

Accepted Answer

The boiling point decreases

Question 16

Which of the following best describes a supercritical fluid?

Accepted Answer

A state with properties of both liquid and gas

Question 17

Which statement about phase diagrams is correct?

Accepted Answer

The critical point is the highest temperature at which a liquid can exist.

Question 18

A sample of water is heated from -25°C to 125°C. Which segment of the heating curve involves the greatest energy input per mole?

Accepted Answer

Boiling water at 100°C

Question 19

Which of the following molecules is most likely to be miscible with water?

Accepted Answer

Ethanol (C$_2$H$_5$OH)

Question 20

Which intermolecular force is present in all molecules and atoms?

Accepted Answer

Dispersion forces

Liquids, Solids, and Intermolecular Forces: Structured Study Notes

Study Guide - Practice Questions