Question 1

Which assumption is NOT part of the kinetic-molecular theory of gases?

Accepted Answer

A) A gas consists of particles that move randomly and rapidly. 
B) The size of gas particles is small compared to the space between the particles. 
C) Because the space between gas particles is large,gas particles exert no attractive forces on each other. 
D) The kinetic energy of gas particles does not change with increasing temperature. 
E) When gas particles collide with each other,they rebound and travel in new directions. 
A) A gas consists of particles that move randomly and rapidly. 
B) The size of gas particles is small compared to the space between the particles. 
C) Because the space between gas particles is large,gas particles exert no attractive forces on each other. 
D) The kinetic energy of gas particles does not change with increasing temperature. 
E) When gas particles collide with each other,they rebound and travel in new directions.

Question 2

The temperature of a 0.750-L gas sample at 25 °C and 2.00 atm is changed to 250 °C. What is the final pressure of the system,at constant volume?

Accepted Answer

A) 20.0 atm 
B) 0.200 atm 
C) 3.51 atm 
D) 0.427 atm 
A) 20.0 atm 
B) 0.200 atm 
C) 3.51 atm 
D) 0.427 atm

Question 3

Whether a substance exists as a gas,liquid,or solid depends on the balance between the kinetic energy of its particles and the strength of the interactions between the particles.

Accepted Answer

A) True 
 B)False

Question 4

Which is a network solid?

Accepted Answer

A) NaBr 
B) Ag 
C) SiO2 
D) Na 
E) Sucrose (C12H22O11) 
A) NaBr 
B) Ag 
C) SiO2 
D) Na 
E) Sucrose (C12H22O11)

Question 5

It requires less heat to melt a 10-g sample of water than to vaporize a 10-g sample of water.

Accepted Answer

A) True 
 B)False

Question 6

Surface tension measures which of the following?

Accepted Answer

A) A liquid's resistance to flow 
B) A liquid's resistance to spreading out 
C) A liquid's ability to boil at low temperatures 
D) The molecular weight of a compound 
A) A liquid's resistance to flow 
B) A liquid's resistance to spreading out 
C) A liquid's ability to boil at low temperatures 
D) The molecular weight of a compound

Question 7

The higher the vapor pressure of a compound,the higher the boiling point of the compound.

Accepted Answer

A) True 
 B)False

Question 8

Which gas law describes the relationship between the volume and temperature of a sample of gas at constant pressure?

Accepted Answer

A) Boyle's law 
B) Charles's law 
C) Gay-Lussac's law 
D) Avogadro's law 
E) Dalton's law 
A) Boyle's law 
B) Charles's law 
C) Gay-Lussac's law 
D) Avogadro's law 
E) Dalton's law

Question 9

Evaporation is an endothermic process.

Accepted Answer

A) True 
 B)False

Question 10

A weather balloon contains 233 L of helium at 22 °C and 760. mm Hg. What is the volume of the balloon when it ascends to an altitude where the temperature is -54 °C and 511 mm Hg?

Accepted Answer

A) 2.24 × 107 L 
B) 467 L 
C) 116 L 
D) 257 L 
A) 2.24 × 107 L 
B) 467 L 
C) 116 L 
D) 257 L

Question 11

STP is defined as a pressure of exactly one atmosphere and a temperature of 25 °C.

Accepted Answer

A) True 
 B)False

Question 12

What is the volume of 62.3 g of nitrogen gas at STP?

Accepted Answer

A) 22.4 L 
B) 49.8 L 
C) 99.6 L 
D) 2.78 L 
A) 22.4 L 
B) 49.8 L 
C) 99.6 L 
D) 2.78 L

Question 13

Condensation is the opposite of sublimation.

Accepted Answer

A) True 
 B)False

Question 14

When octane evaporates,what kind of attractive forces are overcome?

Accepted Answer

A) Covalent bonding between carbon and hydrogen atoms 
B) Hydrogen bonding between octane molecules 
C) Dipole-dipole interactions between octane molecules 
D) London dispersion forces between octane molecules 
A) Covalent bonding between carbon and hydrogen atoms 
B) Hydrogen bonding between octane molecules 
C) Dipole-dipole interactions between octane molecules 
D) London dispersion forces between octane molecules

Question 15

The kinetic energy of gas particles ________ with increasing temperature.

Accepted Answer

The answer of The kinetic energy of gas particles ________...

Question 16

Propanol,CH3CH2CH2OH,has the structure shown below. What is the strongest type of intermolecular force that exists between two propanol molecules?

Accepted Answer

A) London dispersion forces 
B) Hydrogen bonding 
C) Temporary dipole interactions 
D) Dipole-dipole interactions 
A) London dispersion forces 
B) Hydrogen bonding 
C) Temporary dipole interactions 
D) Dipole-dipole interactions

Question 17

Ethylene glycol is expected to be less viscous than propane.

Accepted Answer

A) True 
 B)False

Question 18

_____ are due to momentary changes in electron density in a molecule.

Accepted Answer

London dispersion fo

Question 19

The stronger the intermolecular forces,the lower the vapor pressure of a substance at a given temperature.

Accepted Answer

A) True 
 B)False

Question 20

What volume does 7.50 × 1020 molecules of O2 occupy at STP?

Accepted Answer

A) 22.4 L 
B) 1.68 × 1022 L 
C) 0.0279 L 
D) 2.79 L 
A) 22.4 L 
B) 1.68 × 1022 L 
C) 0.0279 L 
D) 2.79 L

Exam 7: Gases,liquids,and Solids

Which assumption is NOT part of the kinetic-molecular theory of gases?

The temperature of a 0.750-L gas sample at 25 °C and 2.00 atm is changed to 250 °C. What is the final pressure of the system,at constant volume?

Whether a substance exists as a gas,liquid,or solid depends on the balance between the kinetic energy of its particles and the strength of the interactions between the particles.

Which is a network solid?

It requires less heat to melt a 10-g sample of water than to vaporize a 10-g sample of water.

Surface tension measures which of the following?

The higher the vapor pressure of a compound,the higher the boiling point of the compound.

Which gas law describes the relationship between the volume and temperature of a sample of gas at constant pressure?

Evaporation is an endothermic process.

A weather balloon contains 233 L of helium at 22 °C and 760. mm Hg. What is the volume of the balloon when it ascends to an altitude where the temperature is -54 °C and 511 mm Hg?

STP is defined as a pressure of exactly one atmosphere and a temperature of 25 °C.

What is the volume of 62.3 g of nitrogen gas at STP?

Condensation is the opposite of sublimation.

When octane evaporates,what kind of attractive forces are overcome?

The kinetic energy of gas particles ________ with increasing temperature.

Propanol,CH3CH2CH2OH,has the structure shown below. What is the strongest type of intermolecular force that exists between two propanol molecules?

Ethylene glycol is expected to be less viscous than propane.

_____ are due to momentary changes in electron density in a molecule.

The stronger the intermolecular forces,the lower the vapor pressure of a substance at a given temperature.

What volume does 7.50 × 1020 molecules of O2 occupy at STP?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes,reaction Rates,and Equilibrium

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen,halogen,or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids,esters,and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids,proteins,and Enzymes

Nucleic Acids and Protein Synthesis

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

Propanol,CH₃CH₂CH₂OH,has the structure shown below. What is the strongest type of intermolecular force that exists between two propanol molecules?

What volume does 7.50 × 10²⁰ molecules of O₂ occupy at STP?