Question 1

How many kJ of heat are needed to completely vaporize 23.4 g of H2O? The heat of vaporization for water at the boiling point is 40.6kJ/mole.

Accepted Answer

A) 31.2 
B) 52.8 
C) 23.4 
D) 2.26 
E) none of the above 
A) 31.2 
B) 52.8 
C) 23.4 
D) 2.26 
E) none of the above

Question 2

Which statement below is false?

Accepted Answer

A) A hydrogen bond is the strongest of the intermolecular forces. 
B) A hydrogen atom must be bonded directly to fluorine,oxygen,or nitrogen to exhibit hydrogen bonding. 
C) The large electronegativity difference between hydrogen and an F,O,or N atom is essential for the formation of a hydrogen bond. 
D) A hydrogen bond is only 2-5% the strength of a typical covalent bond. 
E) none of the above 
A) A hydrogen bond is the strongest of the intermolecular forces. 
B) A hydrogen atom must be bonded directly to fluorine,oxygen,or nitrogen to exhibit hydrogen bonding. 
C) The large electronegativity difference between hydrogen and an F,O,or N atom is essential for the formation of a hydrogen bond. 
D) A hydrogen bond is only 2-5% the strength of a typical covalent bond. 
E) none of the above

Question 3

Which intermolecular force found in CCL2H2 is the strongest?

Accepted Answer

A) dispersion forces 
B) dipole-dipole forces 
C) hydrogen bonding 
D) X-forces 
E) none of the above 
A) dispersion forces 
B) dipole-dipole forces 
C) hydrogen bonding 
D) X-forces 
E) none of the above

Question 4

Which statement about surface tension is FALSE?

Accepted Answer

A) Liquids tend to minimize their surface area. 
B) Molecules on the surface of the liquid have fewer molecules to interact with. 
C) Increased intermolecular forces increase surface tension. 
D) Items with densities lower than water will sink due to surface tension. 
E) All of the above statements are true. 
A) Liquids tend to minimize their surface area. 
B) Molecules on the surface of the liquid have fewer molecules to interact with. 
C) Increased intermolecular forces increase surface tension. 
D) Items with densities lower than water will sink due to surface tension. 
E) All of the above statements are true.

Question 5

Which atomic solid has the highest melting point?

Accepted Answer

A) Cu 
B) Si 
C) Xe 
D) Fe 
E) not enough information 
A) Cu 
B) Si 
C) Xe 
D) Fe 
E) not enough information

Question 6

Dipole-dipole forces are weaker than dispersion forces.

Accepted Answer

A) True 
 B)False

Question 7

Atoms in a solid are always arranged in a well-ordered pattern.

Accepted Answer

A) True 
 B)False

Question 8

Sublimation is the process of a liquid being converted directly to a gas.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following statements is false?

Accepted Answer

A) Evaporation is an endothermic process. 
B) A puddle of water cools down as it evaporates. 
C) As a liquid is converted into a gas,the liquid absorbs heat. 
D) All of the above are true. 
E) None of the above are true. 
A) Evaporation is an endothermic process. 
B) A puddle of water cools down as it evaporates. 
C) As a liquid is converted into a gas,the liquid absorbs heat. 
D) All of the above are true. 
E) None of the above are true.

Question 10

Evaporation is decreased by increasing the intermolecular forces.

Accepted Answer

A) True 
 B)False

Question 11

Increasing the temperature increases the vaporization rate of a liquid because the excess energy is used to break covalent bonds.

Accepted Answer

A) True 
 B)False

Question 12

Intermolecular forces hold atoms and molecules in place in a solid.

Accepted Answer

A) True 
 B)False

Question 13

Assuming that the molecules carbon monoxide (CO)and nitrogen (N2)have similar electron clouds,which statement below is TRUE?

Accepted Answer

A) CO has the higher boiling point because it experiences dipole-dipole forces. 
B) N2 has the higher boiling point because it experiences dipole-dipole forces. 
C) The N2 has the higher boiling point because it has greater dispersion forces. 
D) Both CO and N2 must have the same boiling point. 
E) none of the above 
A) CO has the higher boiling point because it experiences dipole-dipole forces. 
B) N2 has the higher boiling point because it experiences dipole-dipole forces. 
C) The N2 has the higher boiling point because it has greater dispersion forces. 
D) Both CO and N2 must have the same boiling point. 
E) none of the above

Question 14

Paradichlorobenzene,a material used in "moth balls," is known to go directly from a solid form to a gaseous form.This process is known as:

Accepted Answer

A) melting 
B) evaporation 
C) condensation 
D) boiling 
E) sublimation 
A) melting 
B) evaporation 
C) condensation 
D) boiling 
E) sublimation

Question 15

Compare a small pot of water that is boiling vigorously to a large pot of water that is boiling gently.Which statement is TRUE?

Accepted Answer

A) The small pot is boiling at higher temperature than the large pot. 
B) The large pot is boiling at a higher temperature than the small pot. 
C) Both pots are boiling at the same temperature. 
D) The vapor pressure of the liquid is greater than the pressure above the pot in each case. 
E) none of the above 
A) The small pot is boiling at higher temperature than the large pot. 
B) The large pot is boiling at a higher temperature than the small pot. 
C) Both pots are boiling at the same temperature. 
D) The vapor pressure of the liquid is greater than the pressure above the pot in each case. 
E) none of the above

Question 16

The tendency of a liquid to minimize its surface area is called:

Accepted Answer

A) capillary action. 
B) viscosity. 
C) surface tension. 
D) vaporization. 
E) none of the above 
A) capillary action. 
B) viscosity. 
C) surface tension. 
D) vaporization. 
E) none of the above

Question 17

Dry ice (solid CO2)is which type of solid?

Accepted Answer

A) molecular solid 
B) ionic solid 
C) covalent atomic solid 
D) nonbonding atomic solid 
E) metallic atomic solid 
A) molecular solid 
B) ionic solid 
C) covalent atomic solid 
D) nonbonding atomic solid 
E) metallic atomic solid

Question 18

Ion-dipole forces occur in mixtures of ionic compounds and polar compounds.

Accepted Answer

A) True 
 B)False

Question 19

In northern climates,it is common to have a layer of frost form on cars that have been out overnight in the winter.During the day the frost layer disappears despite the temperature of the ice remaining below freezing.How?

Accepted Answer

A) The frost melts due to the sun heating the surface of the car above the melting point. 
B) The frost evaporates due to the sun heating the solid. 
C) The frost cycles as does the saturation level of moisture in the winter air does from night to day. 
D) The frost sublimes directly from solid ice to water vapor. 
E) none of the above 
A) The frost melts due to the sun heating the surface of the car above the melting point. 
B) The frost evaporates due to the sun heating the solid. 
C) The frost cycles as does the saturation level of moisture in the winter air does from night to day. 
D) The frost sublimes directly from solid ice to water vapor. 
E) none of the above

Question 20

All intermolecular forces are broken when a liquid vaporizes into a gas.

Accepted Answer

A) True 
 B)False

How many kJ of heat are needed to completely vaporize 23.4 g of H₂O? The heat of vaporization for water at the boiling point is 40.6kJ/mole.

Which statement below is false?

Which intermolecular force found in CCL₂H₂ is the strongest?

Which statement about surface tension is FALSE?

Which atomic solid has the highest melting point?

Dipole-dipole forces are weaker than dispersion forces.

Atoms in a solid are always arranged in a well-ordered pattern.

Sublimation is the process of a liquid being converted directly to a gas.

Which of the following statements is false?

Evaporation is decreased by increasing the intermolecular forces.

Increasing the temperature increases the vaporization rate of a liquid because the excess energy is used to break covalent bonds.

Intermolecular forces hold atoms and molecules in place in a solid.

Assuming that the molecules carbon monoxide (CO)and nitrogen (N₂)have similar electron clouds,which statement below is TRUE?

Paradichlorobenzene,a material used in "moth balls," is known to go directly from a solid form to a gaseous form.This process is known as:

Compare a small pot of water that is boiling vigorously to a large pot of water that is boiling gently.Which statement is TRUE?

The tendency of a liquid to minimize its surface area is called:

Dry ice (solid CO₂)is which type of solid?

Ion-dipole forces occur in mixtures of ionic compounds and polar compounds.

In northern climates,it is common to have a layer of frost form on cars that have been out overnight in the winter.During the day the frost layer disappears despite the temperature of the ice remaining below freezing.How?

All intermolecular forces are broken when a liquid vaporizes into a gas.

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Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

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Acids and Bases

Chemical Equilibrium

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Exam 12: Liquids, solids, and Intermolecular Forces

How many kJ of heat are needed to completely vaporize 23.4 g of H2O? The heat of vaporization for water at the boiling point is 40.6kJ/mole.

Which statement below is false?

Which intermolecular force found in CCL2H2 is the strongest?

Which statement about surface tension is FALSE?

Which atomic solid has the highest melting point?

Dipole-dipole forces are weaker than dispersion forces.

Atoms in a solid are always arranged in a well-ordered pattern.

Sublimation is the process of a liquid being converted directly to a gas.

Which of the following statements is false?

Evaporation is decreased by increasing the intermolecular forces.

Increasing the temperature increases the vaporization rate of a liquid because the excess energy is used to break covalent bonds.

Intermolecular forces hold atoms and molecules in place in a solid.

Assuming that the molecules carbon monoxide (CO)and nitrogen (N2)have similar electron clouds,which statement below is TRUE?

Paradichlorobenzene,a material used in "moth balls," is known to go directly from a solid form to a gaseous form.This process is known as:

Compare a small pot of water that is boiling vigorously to a large pot of water that is boiling gently.Which statement is TRUE?

The tendency of a liquid to minimize its surface area is called:

Dry ice (solid CO2)is which type of solid?

Ion-dipole forces occur in mixtures of ionic compounds and polar compounds.

In northern climates,it is common to have a layer of frost form on cars that have been out overnight in the winter.During the day the frost layer disappears despite the temperature of the ice remaining below freezing.How?

All intermolecular forces are broken when a liquid vaporizes into a gas.

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

How many kJ of heat are needed to completely vaporize 23.4 g of H₂O? The heat of vaporization for water at the boiling point is 40.6kJ/mole.

Which intermolecular force found in CCL₂H₂ is the strongest?

Assuming that the molecules carbon monoxide (CO)and nitrogen (N₂)have similar electron clouds,which statement below is TRUE?

Dry ice (solid CO₂)is which type of solid?