$$Q = m \times C \times \Delta T$$

Question 1

Which of the following statements best explains why liquids form spherical drops?

Accepted Answer

Spherical drops minimize the liquid's surface area, reducing potential energy.

Question 2

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

Accepted Answer

High viscosity and low rate of vaporization.

Question 3

Which equation correctly represents the amount of heat required to raise the temperature of a liquid?

Accepted Answer

$$Q = m 	imes C 	imes \Delta T$$

Question 4

What happens to the viscosity of a liquid as its temperature increases?

Accepted Answer

Viscosity decreases because molecules move faster and overcome attractions.

Question 5

Which of the following best describes capillary action in a thin tube?

Accepted Answer

It results from both adhesive forces with the tube and cohesive forces within the liquid.

Question 6

A sample of water is heated from 20°C to 100°C. At 100°C, the temperature remains constant as heat is added. What process is occurring?

Accepted Answer

Boiling (vaporization)

Question 7

Which of the following statements about vapor pressure is correct?

Accepted Answer

Vapor pressure increases as intermolecular forces become weaker.

Question 8

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

Accepted Answer

Dispersion (London) forces

Question 9

Why do noble gases have low boiling points?

Accepted Answer

They are held together only by weak dispersion forces.

Question 10

Which of the following best describes the difference between graphite and diamond?

Accepted Answer

Graphite has sp2 hybridization and is a good electrical conductor; diamond has sp3 hybridization and is an electrical insulator.

Question 11

Which of the following is true about the heat of fusion and heat of vaporization?

Accepted Answer

Heat of fusion is much less than heat of vaporization.

Question 12

A solution of NaCl in water is an example of which type of intermolecular force?

Accepted Answer

Ion-dipole force

Question 13

Which of the following statements about boiling point is correct?

Accepted Answer

Boiling point is reached when the vapor pressure of a liquid equals the external pressure.

Question 14

Which process is exothermic?

Accepted Answer

Condensation

Question 15

Which of the following best describes a crystalline solid?

Accepted Answer

Atoms, ions, or molecules have a highly ordered arrangement throughout.

Question 16

Which of the following statements about semiconductors is correct?

Accepted Answer

Semiconductors have a small band gap and their conductivity increases with temperature.

Question 17

Which of the following is a correct statement about n-type and p-type semiconductors?

Accepted Answer

P-type semiconductors have electron 'holes' in the valence band that allow conduction.

Question 18

Which of the following is true about the melting point of a solid?

Accepted Answer

It is the temperature at which molecules have enough energy to overcome intermolecular forces and become a liquid.

Question 19

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are long chain-like molecules composed of repeating units called monomers.

Question 20

Which of the following best explains why graphite is used as a lubricant?

Accepted Answer

Graphite's sheets are held together by weak dispersion forces, allowing them to slide past each other.

Liquids, Solids, and Intermolecular Forces: Key Concepts and Properties

Study Guide - Practice Questions