Question 1

Which of the following intermolecular forces is present in all molecular substances, regardless of their polarity?

Accepted Answer

London Dispersion Forces

Question 2

A liquid with strong intermolecular forces will generally have which of the following properties compared to a liquid with weak intermolecular forces?

Accepted Answer

Higher boiling point

Question 3

Which equation is used to calculate the vapor pressure of a liquid at a given temperature using the enthalpy of vaporization?

Accepted Answer

$$\ln P = -\frac{\Delta H_{vap}}{R} \left( \frac{1}{T} \right) + C$$

Question 4

Which of the following best explains why water has a much higher boiling point than methane ($$CH_4$$)?

Accepted Answer

Water forms hydrogen bonds, while methane only has London dispersion forces.

Question 5

A phase diagram for a substance shows a triple point at 0.5 atm and 273 K. What does the triple point represent?

Accepted Answer

The temperature and pressure where solid, liquid, and gas phases coexist in equilibrium.

Question 6

Which of the following will increase the surface tension of a liquid?

Accepted Answer

Increasing the strength of intermolecular forces

Question 7

Which type of crystal structure is formed by sodium chloride ($$NaCl$$)?

Accepted Answer

Ionic crystal

Question 8

A solution is prepared by mixing 100 g of water and 10 g of NaCl. After stirring, some NaCl remains undissolved. What can you conclude about the solution?

Accepted Answer

The solution is saturated.

Question 9

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonding requires hydrogen to be bonded to a highly electronegative atom such as N, O, or F.

Question 10

Which of the following best describes the process of dissolving an ionic solid like NaCl in water?

Accepted Answer

Water molecules surround the ions, stabilizing them through ion-dipole interactions.

Question 11

A heating curve for water shows a plateau at 100°C. What is happening to the water during this plateau?

Accepted Answer

The water is undergoing a phase change from liquid to gas.

Question 12

Which of the following will increase the viscosity of a liquid?

Accepted Answer

Increasing the strength of intermolecular forces

Question 13

Which of the following is the correct order of boiling points for the following substances: $$H_2O$$, $$CH_4$$, $$NH_3$$?

Accepted Answer

$$CH_4$$ \u003c $$NH_3$$ \u003c H_2O$$

Question 14

Which of the following best explains why adding a solute to water increases its boiling point?

Accepted Answer

The solute disrupts the formation of vapor, requiring more energy to boil.

Question 15

Which of the following is true about the critical point in a phase diagram?

Accepted Answer

It is the highest temperature and pressure at which a liquid can exist.

Question 16

Which of the following is the strongest type of intermolecular force present in pure ammonia ($$NH_3$$)?

Accepted Answer

Hydrogen Bonding

Question 17

A sample of a solid has a density of $$2.70 	ext{ g/cm}^3$$ and a mass of $$10.0 	ext{ g}. $$What is its volume?

Accepted Answer

$$3.70 	ext{ cm}^3$$

Question 18

Which of the following statements about solubility is correct?

Accepted Answer

Solubility of solids in water generally increases with increasing temperature.

Question 19

Which of the following best describes a metallic crystal?

Accepted Answer

A lattice of positive ions surrounded by a sea of delocalized electrons.

Question 20

Which of the following is the correct formula for calculating the radius of a simple cubic unit cell given the edge length $$a$$?

Accepted Answer

$$r = \frac{a}{2}$$

Intermolecular Forces, Properties of Liquids, Phase Changes, and Solubility – General Chemistry II Study Guide

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