Question 1

Give the change in condition to go from a liquid to a gas.

Accepted Answer

A)  increase heat or reduce pressure 
B)  increase heat or increase pressure 
C)  cool or reduce pressure 
D)  cool or increase pressure 
E)  none of the above 
A)  increase heat or reduce pressure 
B)  increase heat or increase pressure 
C)  cool or reduce pressure 
D)  cool or increase pressure 
E)  none of the above

Question 2

Which of the following substances would you predict to have the highest ΔHvap?

Accepted Answer

A)  CH3Cl 
B)  HF 
C)  HOCH2CH2OH 
D)  CH3CH2OH  
E)  CH3CH2CH2CH3 
A)  CH3Cl 
B)  HF 
C)  HOCH2CH2OH 
D)  CH3CH2OH  
E)  CH3CH2CH2CH3

Question 3

Choose the pair of substances that are most likely to form a homogeneous solution.

Accepted Answer

A)  C6H14 and C10H20 
B)  LiCl and C5H12 
C)  N2O4 and NH4Cl 
D)  C6H14 and H2O 
E)  None of the pairs above will form a homogeneous solution. 
A)  C6H14 and C10H20 
B)  LiCl and C5H12 
C)  N2O4 and NH4Cl 
D)  C6H14 and H2O 
E)  None of the pairs above will form a homogeneous solution.

Question 4

Identify the substance with the highest viscosity.

Accepted Answer

A)  diesel 
B)  water 
C)  maple syrup 
D)  motor oil 
E)  coffee 
A)  diesel 
B)  water 
C)  maple syrup 
D)  motor oil 
E)  coffee

Question 5

A paper clip floating on the top of water is an example of

Accepted Answer

A)  capillary action. 
B)  viscosity. 
C)  hydrogen bonding. 
D)  surface tension. 
E)  dipole-dipole forces. 
A)  capillary action. 
B)  viscosity. 
C)  hydrogen bonding. 
D)  surface tension. 
E)  dipole-dipole forces.

Question 6

Choose the pair of substances that are most likely to form a homogeneous solution.

Accepted Answer

A)  KCl and Hg 
B)  NaI and C6H14 
C)  C3H8 and C2H5OH 
D)  F2 and PF3 
E)  NH3 and CH3OH 
A)  KCl and Hg 
B)  NaI and C6H14 
C)  C3H8 and C2H5OH 
D)  F2 and PF3 
E)  NH3 and CH3OH

Question 7

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2)at its boiling point,if its ΔHvap is 31.6 kJ/mol?

Accepted Answer

A)  31.2 kJ 
B)  6.49 kJ 
C)  55.1 kJ 
D)  15.4 kJ 
E)  18.1 kJ 
A)  31.2 kJ 
B)  6.49 kJ 
C)  55.1 kJ 
D)  15.4 kJ 
E)  18.1 kJ

Question 8

The enthalpy change for converting 1.00 mol of ice at -25.0°C to water at 60.0°C is   The specific heats of ice,water,and steam are 2.09 J/gK,4.18 J/gK,and 1.84 J/gK,respectively.For H2O,ΔHfus = 6.01 kJ/mol,and ΔHvap = 40.67 kJ/mol.

Accepted Answer

A)  12.28 
B)  6.31 
C)  11.46 
D)  5461 
E)  9.58 
A)  12.28 
B)  6.31 
C)  11.46 
D)  5461 
E)  9.58

Question 9

Identify the characteristics of a liquid.

Accepted Answer

A)  indefinite shape and volume 
B)  indefinite shape, but definite volume 
C)  definite shape and volume 
D)  none of the above 
E)  all of the above 
A)  indefinite shape and volume 
B)  indefinite shape, but definite volume 
C)  definite shape and volume 
D)  none of the above 
E)  all of the above

Question 10

Ethanol (     OH)melts at -114°C.The enthalpy of fusion is 5.02 kJ/mol.The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK,respectively.How much heat (kJ)is needed to convert 25.0 g of solid ethanol at -125°C to liquid ethanol at -80°C?

Accepted Answer

A)  207.3 kJ 
B)  -14.2 kJ 
C)  4.95 kJ 
D)  2224 kJ 
E)  7.24 kJ 
A)  207.3 kJ 
B)  -14.2 kJ 
C)  4.95 kJ 
D)  2224 kJ 
E)  7.24 kJ

Question 11

At atmospheric pressure,ice

Accepted Answer

A)  freezes. 
B)  deposits. 
C)  sublimes. 
D)  melts. 
E)  boils. 
A)  freezes. 
B)  deposits. 
C)  sublimes. 
D)  melts. 
E)  boils.

Question 12

The two strands in DNA are held together by

Accepted Answer

A)  dispersion forces. 
B)  dipole-dipole forces. 
C)  hydrogen bonding. 
D)  ion-dipole forces. 
E)  ionic bonding. 
A)  dispersion forces. 
B)  dipole-dipole forces. 
C)  hydrogen bonding. 
D)  ion-dipole forces. 
E)  ionic bonding.

Question 13

Which of the following compounds exhibits dipole-dipole forces as its strongest attraction between molecules?

Accepted Answer

A)  H2 
B)  HBr  
C)  CO2 
D)  CH3NH2 
E)  Kr 
A)  H2 
B)  HBr  
C)  CO2 
D)  CH3NH2 
E)  Kr

Question 14

Choose the substance with the highest vapor pressure at a given temperature.

Accepted Answer

A)  SiS2 
B)  RbBr 
C)  CH3OCH2CH3 
D)  BH3 
E)  SbH3 
A)  SiS2 
B)  RbBr 
C)  CH3OCH2CH3 
D)  BH3 
E)  SbH3

Question 15

Which of the following statements is TRUE?

Accepted Answer

A)  Vapor pressure increases with temperature. 
B)  Hydrogen bonds are stronger than covalent bonds. 
C)  Intermolecular forces hold the atoms in molecules together. 
D)  Dispersion forces are generally stronger than dipole-dipole forces. 
E)  None of the above is true. 
A)  Vapor pressure increases with temperature. 
B)  Hydrogen bonds are stronger than covalent bonds. 
C)  Intermolecular forces hold the atoms in molecules together. 
D)  Dispersion forces are generally stronger than dipole-dipole forces. 
E)  None of the above is true.

Question 16

Based on the figure above,the boiling point of ethyl alcohol under an external pressure of 0.197 atm is ________°C.

Accepted Answer

A)  80 
B)  70 
C)  60 
D)  20 
E)  40 
A)  80 
B)  70 
C)  60 
D)  20 
E)  40

Question 17

Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube.

Accepted Answer

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

Question 18

On a phase diagram,the fusion curve is between

Accepted Answer

A)  a solid and a gas. 
B)  a solid and a liquid. 
C)  a liquid and a gas. 
D)  two solids. 
E)  two liquids. 
A)  a solid and a gas. 
B)  a solid and a liquid. 
C)  a liquid and a gas. 
D)  two solids. 
E)  two liquids.

Question 19

Sketch the phase diagram of benzene.Make sure to label the axes and the different phases of benzene.Use the physical data provided below.
melting point = 279 K
boiling point = 353 K
Tc = 562 K
Pc = 48.4 atm
Triple Point = 0.05 atm,279 K

Accepted Answer

Sketch should includ

Question 20

Which is expected to have the largest dispersion forces?

Accepted Answer

A)  C H4 
B)  C9H20 
C)  F2 
D)  Si H4 
A)  C H4 
B)  C9H20 
C)  F2 
D)  Si H4

Exam 11: Liquids,solids,and Intermolecular Forces

Give the change in condition to go from a liquid to a gas.

Which of the following substances would you predict to have the highest ΔHvap?

Choose the pair of substances that are most likely to form a homogeneous solution.

Identify the substance with the highest viscosity.

A paper clip floating on the top of water is an example of

Choose the pair of substances that are most likely to form a homogeneous solution.

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2)at its boiling point,if its ΔHvap is 31.6 kJ/mol?

The enthalpy change for converting 1.00 mol of ice at -25.0°C to water at 60.0°C is The specific heats of ice,water,and steam are 2.09 J/gK,4.18 J/gK,and 1.84 J/gK,respectively.For H2O,ΔHfus = 6.01 kJ/mol,and ΔHvap = 40.67 kJ/mol.

Identify the characteristics of a liquid.

Ethanol ( OH)melts at -114°C.The enthalpy of fusion is 5.02 kJ/mol.The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK,respectively.How much heat (kJ)is needed to convert 25.0 g of solid ethanol at -125°C to liquid ethanol at -80°C?

At atmospheric pressure,ice

The two strands in DNA are held together by

Which of the following compounds exhibits dipole-dipole forces as its strongest attraction between molecules?

Choose the substance with the highest vapor pressure at a given temperature.

Which of the following statements is TRUE?

Based on the figure above,the boiling point of ethyl alcohol under an external pressure of 0.197 atm is ________°C.

Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube.

On a phase diagram,the fusion curve is between

Sketch the phase diagram of benzene.Make sure to label the axes and the different phases of benzene.Use the physical data provided below. melting point = 279 K boiling point = 353 K Tc = 562 K Pc = 48.4 atm Triple Point = 0.05 atm,279 K

Which is expected to have the largest dispersion forces?

Matter, measurement, and Problem Solving

Atoms and Elements

Molecules,compounds,and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes,valence Bond Theory,

Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Which of the following substances would you predict to have the highest ΔH_vap?

How much energy is required to vaporize 48.7 g of dichloromethane (CH₂Cl₂)at its boiling point,if its ΔH_vap is 31.6 kJ/mol?

The enthalpy change for converting 1.00 mol of ice at -25.0°C to water at 60.0°C is The specific heats of ice,water,and steam are 2.09 J/gK,4.18 J/gK,and 1.84 J/gK,respectively.For H₂O,ΔH_fus = 6.01 kJ/mol,and ΔH_vap =40.67 kJ/mol.

Sketch the phase diagram of benzene.Make sure to label the axes and the different phases of benzene.Use the physical data provided below. melting point = 279 K boiling point = 353 K T_c = 562 K P_c = 48.4 atm Triple Point = 0.05 atm,279 K