Question 1

Which of the following best describes vapor pressure at the surface of a liquid?

Accepted Answer

The pressure exerted by a gas at the surface of a liquid

Question 2

Vapor pressure is an equilibrium between which two processes?

Accepted Answer

Vaporization and condensation

Question 3

At the boiling point, which two phases are in equilibrium?

Accepted Answer

Liquid and gas

Question 4

Which of the following is the correct formula for calculating the heat required to raise the temperature of water?

Accepted Answer

$q = mc\Delta T$

Question 5

Given the specific heat of ice is $2.09 \ \frac{J}{g \cdot ^\circ C}$, how much energy is required to heat 10 g of ice from $-10^\circ C$ to $0^\circ C$?

Accepted Answer

$q = (10)(2.09)(10) = 209 \ J$

Question 6

Which point on a phase diagram represents the unique set of conditions where all three phases coexist?

Accepted Answer

Triple point

Question 7

At what temperature can we no longer distinguish between the liquid and gas phases on a phase diagram?

Accepted Answer

At the critical point

Question 8

Which of the following statements about viscosity is correct?

Accepted Answer

Viscosity decreases as temperature increases

Question 9

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

Accepted Answer

London dispersion forces

Question 10

A sample of water is heated from $-10^\circ C$ to $110^\circ C$. Which formula would you use to calculate the energy required for the phase change from liquid to gas?

Accepted Answer

$q = m \Delta H_{vaporization}$

Question 11

Which of the following would have the highest surface tension at a given temperature?

Accepted Answer

A molecule with strong hydrogen bonding

Question 12

On a phase diagram, what does the line separating the solid and liquid phases represent?

Accepted Answer

The melting point curve

Question 13

Which of the following best describes the relationship between intermolecular forces and boiling point?

Accepted Answer

Stronger intermolecular forces result in a higher boiling point

Question 14

If a substance is at its normal boiling point, what is the pressure?

Accepted Answer

$1 \ atm$

Question 15

Which process is represented by the upward arrow labeled 'I' on a phase diagram from the gas to the liquid region?

Accepted Answer

Condensation

Question 16

Which of the following would have the lowest boiling point?

Accepted Answer

A molecule with only London dispersion forces

Question 17

Which formula would you use to calculate the energy required to melt a solid at its melting point?

Accepted Answer

$q = m \Delta H_{fusion}$

Question 18

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

Accepted Answer

It is the temperature and pressure above which the liquid and gas phases are indistinguishable

Question 19

Which of the following best describes the relationship between temperature and viscosity for most liquids?

Accepted Answer

As temperature increases, viscosity decreases

Question 20

Which of the following is the correct value for the enthalpy of vaporization of water?

Accepted Answer

$2260 \ \frac{J}{g}$

Liquids, Solids, and Intermolecular Forces: Study Guide

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