Question 1

Which of the following is true of London dispersion forces?

Accepted Answer

A)   They increase as the number of electrons in a molecule increases.
B)   They are only present in some molecules.
C)   Both a and b are correct.
D)   Neither a nor b is correct. A

Question 2

The term "vapor pressure of a liquid" means which of the following?

Accepted Answer

A)   the pressure exerted by a liquid
B)   the partial pressure exerted by a gas in equilibrium with its liquid
C)   both a and b
D)   neither a nor b B

Question 3

Chloroform has a normal boiling point of 61.7°C. Which of the following is true?

Accepted Answer

A)   At any temperature the vapor pressure of chloroform is less than that of water.
B)   Chloroform is more volatile than water.
C)   Both a and b are correct.
D)   Neither a nor b is correct. B

Question 4

A closed flask contains a 0.25 moles of O2 which exerts a pressure of 0.50 atm. If 0.75 moles of CO2 is added to the container what is the total pressure in the flask?

Accepted Answer

A)   0.50 atm
B)   1.0 atm
C)   1.5 atm
D)   2.0 atm

Question 5

Which of the following phase changes does not involve a liquid?

Accepted Answer

A)   evaporation
B)   melting
C)   sublimation
D)   None, they all involve a liquid.

Question 6

Air pressure can be expressed in which of the following units?

Accepted Answer

A)   atmospheres
B)   millimeters of Hg
C)   torr
D)   any of these

Question 7

The combined gas law combines which gas laws?

Accepted Answer

A)   Boyle's and Charles's
B)   Charles's and Gay-Lussac's
C)   Boyle's and Gay-Lussac's
D)   Boyle's, Charles's and Gay-Lussac's

Question 8

Which of the following is a mathematical statement of Gay-Lussac's Law?

Accepted Answer

A)   P1/V2 = P2/V1
B)   P1/V1 = P2/V2
C)   P1/T2 = P2/T1
D)   P1/T1 = P2/T2

Question 9

Which of the following is a mathematical statement of Charles's Law?

Accepted Answer

A)   P1/V2 = P2/V1
B)   P1/V1 = P2/V2
C)   V1/T2 = V2/T1
D)   V1/T1 = V2/T2

Question 10

Which of the following is a mathematical statement of Boyle's Law?

Accepted Answer

A)   P1V2 = P2V1
B)   P1V1 = P2V2
C)   P1/T2 = P2/T1
D)   P1/T1 = P2/T2

Question 11

If an 8.00 gram sample of molecular oxygen at 1.00 atm pressure occupies 3.00 L, what is the temperature of the sample?

Accepted Answer

A)   146°C
B)   146 K
C)   73°C
D)   73 K

Question 12

A gas is expanded from an initial volume of 20.5 L at 0.92 atm at 23 °C to a final volume of 34.6 L. During the expansion the gas cools to 12 °C. What is the final pressure?

Accepted Answer

A)   0.28 atm
B)   0.52 atm
C)   0.57 atm
D)   1.9 atm

Question 13

Which of the following is true of the types attractive forces present in the three states of matter?

Accepted Answer

A)   They are different in each of the three states.
B)   They are the same in each of the three states.
C)   They are the same in gases and liquids, but different in solids.
D)   They are the same in liquids and solids, but different in gases.

Question 14

Which of the following pairs engage in hydrogen bonding?

Accepted Answer

A)   water with methanol, CH3OH
B)   two molecules of methane
C)   both a and b
D)   neither a nor b

Question 15

According to the kinetic molecular theory, which of the following is not true?

Accepted Answer

A)   Gas molecules are assumed to have no volume.
B)   Gas pressure is caused by collisions between gas molecules and the container walls.
C)   When gas molecules collide they stick together.
D)   None, all of the above are true.

Question 16

A student has equal-volume samples of three gases. All the gases are at the same temperature and pressure. If the three gases are O2, CO2, NH3, which sample contains the largest number of atoms?

Accepted Answer

A)   O2
B)   CO2
C)   NH3
D)   None, they all contain the same number of atoms.

Question 17

According to the kinetic molecular theory, which of the following is not true?

Accepted Answer

A)   The average kinetic energy of gas particles is proportional to the Kelvin temperature.
B)   Gas molecules are assumed to have no volume.
C)   Gas pressure is caused by collisions between gas molecules and the container walls.
D)   None, all of the above are true.

Question 18

Which of the following is called standard temperature and pressure?

Accepted Answer

A)   0°C and 1 atm
B)   0°F and 1 atm
C)   0 K and 1 atm
D)   none of these

Question 19

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

Accepted Answer

A)   diamond
B)   dry ice
C)   sodium
D)   sodium chloride

Question 20

A closed flask contains a 0.25 moles of O2 which exerts a pressure of 0.50 atm. If 0.75 moles of CO2 is added to the container what is the pressure of oxygen?

Accepted Answer

A)   0.50 atm
B)   1.0 atm
C)   1.5 atm
D)   2.0 atm

Exam 5: Gases, Liquids, and Solids

Which of the following is true of London dispersion forces?

The term "vapor pressure of a liquid" means which of the following?

Chloroform has a normal boiling point of 61.7°C. Which of the following is true?

A closed flask contains a 0.25 moles of O₂ which exerts a pressure of 0.50 atm. If 0.75 moles of CO₂ is added to the container what is the total pressure in the flask?

Which of the following phase changes does not involve a liquid?

Air pressure can be expressed in which of the following units?

The combined gas law combines which gas laws?

Which of the following is a mathematical statement of Gay-Lussac's Law?

Which of the following is a mathematical statement of Charles's Law?

Which of the following is a mathematical statement of Boyle's Law?

If an 8.00 gram sample of molecular oxygen at 1.00 atm pressure occupies 3.00 L, what is the temperature of the sample?

A gas is expanded from an initial volume of 20.5 L at 0.92 atm at 23 °C to a final volume of 34.6 L. During the expansion the gas cools to 12 °C. What is the final pressure?

Which of the following is true of the types attractive forces present in the three states of matter?

Which of the following pairs engage in hydrogen bonding?

According to the kinetic molecular theory, which of the following is not true?

A student has equal-volume samples of three gases. All the gases are at the same temperature and pressure. If the three gases are O₂, CO₂, NH₃, which sample contains the largest number of atoms?

According to the kinetic molecular theory, which of the following is not true?

Which of the following is called standard temperature and pressure?

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

A closed flask contains a 0.25 moles of O₂ which exerts a pressure of 0.50 atm. If 0.75 moles of CO₂ is added to the container what is the pressure of oxygen?