Question 1

The amount of heat required to melt one mole of a solid is called the:

Accepted Answer

A) heat of vaporization. 
B) heat of fusion. 
C) heating curve. 
D) cooling curve. 
E) none of the above 
A) heat of vaporization. 
B) heat of fusion. 
C) heating curve. 
D) cooling curve. 
E) none of the above

Question 2

Which intermolecular force increases with increasing molar mass?

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 3

What is the heat of vaporization(kJ/mol)if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point?

Accepted Answer

A) 1288 
B) 1.29 
C) 0.776 
D) 12.2 
E) none of the above 
A) 1288 
B) 1.29 
C) 0.776 
D) 12.2 
E) none of the above

Question 4

Hydrogen bonding occurs whenever hydrogen is present.

Accepted Answer

A) True 
 B)False

Question 5

Solids usually have much greater densities than gases because molecules of a solid are much farther apart.

Accepted Answer

A) True 
 B)False

Question 6

How many kJ of heat are needed to completely melt 17.3 g of H2O,given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.

Accepted Answer

A) 0.961 
B) 5.79 
C) 1.04 
D) 6.26 
E) none of the above 
A) 0.961 
B) 5.79 
C) 1.04 
D) 6.26 
E) none of the above

Question 7

How many grams of C4H10O can be melted by 1.00 x 103 J?
Given ΔHfus = 7.27 kJ/mol

Accepted Answer

A) 14.5 
B) 3.64 
C) 20.4 
D) 74.1 
E) none of the above 
A) 14.5 
B) 3.64 
C) 20.4 
D) 74.1 
E) none of the above

Question 8

Which compound will have the highest boiling point?

Accepted Answer

A) CH4 
B) CH3 CH3 
C) CH3C(O)CH3 
D) CH3CH2OH 
E) not enough information 
A) CH4 
B) CH3 CH3 
C) CH3C(O)CH3 
D) CH3CH2OH 
E) not enough information

Question 9

How many joules of heat are needed to completely vaporize 24.40 grams of water at its boiling point?
Given ΔHvap = 40.6 kJ/mol

Accepted Answer

A) 54.97 
B) 5.50 x 104 
C) 29.98 
D) 3.00 x 104 
E) none of the above 
A) 54.97 
B) 5.50 x 104 
C) 29.98 
D) 3.00 x 104 
E) none of the above

Question 10

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 11

Without intermolecular forces,solids and liquids would not exist and all matter would be gaseous.

Accepted Answer

A) True 
 B)False

Question 12

Attraction between the Na+ cation and Cl- anion holds the solid lattice of sodium chloride together.

Accepted Answer

A) True 
 B)False

Question 13

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 14

A 250 gram sample of water at the boiling point had 45.0 kJ of heat added.How many grams of water were vaporized? Heat of vaporization for water is 40.6 kJ/mole.

Accepted Answer

A) 1.11 
B) 20.0 
C) 0.902 
D) 16.2 
E) none of the above 
A) 1.11 
B) 20.0 
C) 0.902 
D) 16.2 
E) none of the above

Question 15

Which intermolecular force is common to all polar molecules but NOT nonpolar molecules?

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 16

When one mole of water vapor at 100°C condenses,it will release an amount of energy equivalent to its heat of vaporization (40.7 kJ).

Accepted Answer

A) True 
 B)False

Question 17

Intermolecular forces determine if a substance is a solid,liquid or gas at room temperature.

Accepted Answer

A) True 
 B)False

Question 18

The melting point is reached when sufficient energy has been added to the molecules in a substance to overcome the intermolecular forces holding them stationary.

Accepted Answer

A) True 
 B)False

Question 19

Which intermolecular force is present in all molecules and atoms?

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 20

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

The amount of heat required to melt one mole of a solid is called the:

Which intermolecular force increases with increasing molar mass?

What is the heat of vaporization(kJ/mol)if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point?

Hydrogen bonding occurs whenever hydrogen is present.

Solids usually have much greater densities than gases because molecules of a solid are much farther apart.

How many kJ of heat are needed to completely melt 17.3 g of H₂O,given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.

How many grams of C₄H₁₀O can be melted by 1.00 x 10³ J? Given ΔH_fus= 7.27 kJ/mol

Which compound will have the highest boiling point?

How many joules of heat are needed to completely vaporize 24.40 grams of water at its boiling point? Given ΔH_vap = 40.6 kJ/mol

Which of the following statements is false?

Without intermolecular forces,solids and liquids would not exist and all matter would be gaseous.

Attraction between the Na⁺ cation and Cl^- anion holds the solid lattice of sodium chloride together.

Which atomic solid has the highest melting point?

A 250 gram sample of water at the boiling point had 45.0 kJ of heat added.How many grams of water were vaporized? Heat of vaporization for water is 40.6 kJ/mole.

Which intermolecular force is common to all polar molecules but NOT nonpolar molecules?

When one mole of water vapor at 100°C condenses,it will release an amount of energy equivalent to its heat of vaporization (40.7 kJ).

Intermolecular forces determine if a substance is a solid,liquid or gas at room temperature.

The melting point is reached when sufficient energy has been added to the molecules in a substance to overcome the intermolecular forces holding them stationary.

Which intermolecular force is present in all molecules and atoms?

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 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

Exam 12: Liquids,solids,and Intermolecular Forces

The amount of heat required to melt one mole of a solid is called the:

Which intermolecular force increases with increasing molar mass?

What is the heat of vaporization(kJ/mol)if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point?

Hydrogen bonding occurs whenever hydrogen is present.

Solids usually have much greater densities than gases because molecules of a solid are much farther apart.

How many kJ of heat are needed to completely melt 17.3 g of H2O,given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.

How many grams of C4H10O can be melted by 1.00 x 103 J? Given ΔHfus = 7.27 kJ/mol

Which compound will have the highest boiling point?

How many joules of heat are needed to completely vaporize 24.40 grams of water at its boiling point? Given ΔHvap = 40.6 kJ/mol

Which of the following statements is false?

Without intermolecular forces,solids and liquids would not exist and all matter would be gaseous.

Attraction between the Na+ cation and Cl- anion holds the solid lattice of sodium chloride together.

Which atomic solid has the highest melting point?

A 250 gram sample of water at the boiling point had 45.0 kJ of heat added.How many grams of water were vaporized? Heat of vaporization for water is 40.6 kJ/mole.

Which intermolecular force is common to all polar molecules but NOT nonpolar molecules?

When one mole of water vapor at 100°C condenses,it will release an amount of energy equivalent to its heat of vaporization (40.7 kJ).

Intermolecular forces determine if a substance is a solid,liquid or gas at room temperature.

The melting point is reached when sufficient energy has been added to the molecules in a substance to overcome the intermolecular forces holding them stationary.

Which intermolecular force is present in all molecules and atoms?

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 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 melt 17.3 g of H₂O,given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.

How many grams of C₄H₁₀O can be melted by 1.00 x 10³ J? Given ΔH_fus= 7.27 kJ/mol

How many joules of heat are needed to completely vaporize 24.40 grams of water at its boiling point? Given ΔH_vap = 40.6 kJ/mol

Attraction between the Na⁺ cation and Cl^- anion holds the solid lattice of sodium chloride together.