Question 1

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

Accepted Answer

A)  Xe
B)  C6H6
C)  SiF4
D)  Br2
E)  N2

Question 2

The normal boiling point of water is ________.

Accepted Answer

A)  0 °C
B)  32 °C
C)  212 °C
D)  100 °C
E)  273 °C

Question 3

At atmospheric pressure,dry ice ________.

Accepted Answer

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

Question 4

Identify the compound that does not have hydrogen bonding.

Accepted Answer

A)  (CH3) 3N
B)  H2O
C)  CH3OH
D)  HF
E)  CH3NH2

Question 5

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point if its ΔvapH is 31.6 kJ mol-1?

Accepted Answer

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

Question 6

Ethanol ( C2H5OH) melts at -114 °C.The enthalpy of fusion is 5.02 kJ mol-1.The specific heats of solid and liquid ethanol are 0.97 J g-1 °C-1 and 2.3 J g-1 °C-1,respectively.How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -145 °C to liquid ethanol at -60 °C?

Accepted Answer

A)  6.58
B)  9.96
C)  8.88
D)  3859
E)  -13.56

Question 7

How much energy is required to vaporize 158 g of butane (C4H10) at its boiling point if its ΔvapH is 24.3 kJ mol-1?

Accepted Answer

A)  15.1 kJ
B)  66.1 kJ
C)  89.4 kJ
D)  11.2 kJ
E)  38.4 kJ

Question 8

What is the strongest type of intermolecular force present in H2?

Accepted Answer

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

Question 9

Give the edge length in terms of r for a simple cubic cell.

Accepted Answer

The answer of Give the edge length in terms of...

Question 10

Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force.

Accepted Answer

A)  Cl2
B)  NH3
C)  HF
D)  NaCl

Question 11

Place the following substances in order of increasing boiling point. CH3CH2OH  \quad Ar  \quad CH3OCH3

Accepted Answer

A)  Ar 3OCH3 3CH2OH
B)  CH3CH2OH 3OCH3
C)  CH3CH2OH 3OCH3 
D)  CH3OCH3 3CH2OH
E)  Ar 3CH2OH 3OCH3

Question 12

Identify the compound that does not have dipole-dipole forces as its strongest force.

Accepted Answer

A)  CH2Cl2
B)  CH3OCH3
C)  CH3Br
D)  HCCl3
E)  CO2

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

A)  SiS2
B)  RbCl
C)  CH3SCH3
D)  BF3
E)  SbH3

Question 15

Which one of the following has a definite shape and volume?

Accepted Answer

A)  gas
B)  liquid
C)  solid
D)  none of the above

Question 16

NaCl crystallizes in a cubic unit cell with Cl- ions on each corner and each face.How many Na+ and Cl- ions are in each unit cell of NaCl?

Accepted Answer

A)  1 Na+ ion and 1 Cl- ion
B)  2 Na+ ions and 2 Cl- ions
C)  4 Na+ ions and 4 Cl- ions
D)  8 Na+ ions and 8 Cl- ions

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

Question 18

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

Accepted Answer

A)  NaCl and Hg
B)  LiF and C6H14
C)  C3H8 and C2H5OH
D)  Br2 and PF3
E)  NH3 and CH3OH

Question 19

Place the following compounds in order of decreasing strength of intermolecular forces. 
I.CH3CH2CH2CH2CH2CH3  \quad II.(CH3) 3CCH3  \quad III.(CH3) 3CCH2CH3

Accepted Answer

A)  III > II > I
B)  I > III > II
C)  I > II > III
D)  II > III > I
E)  III > I > II

Question 20

Describe the difference between the conduction band and the valence band.

Accepted Answer

The valence band is the group of highest...

Exam 11: Liquids, solids, and Intermolecular Forces

Ethanol ( C2H5OH) melts at -114 °C.The enthalpy of fusion is 5.02 kJ mol-1.The specific heats of solid and liquid ethanol are 0.97 J g-1 °C-1 and 2.3 J g-1 °C-1,respectively.How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -145 °C to liquid ethanol at -60 °C?

Correct AnswerverifiedShow Answer

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point if its ΔvapH is 31.6 kJ mol-1?

Correct AnswerverifiedShow Answer

Place the following compounds in order of decreasing strength of intermolecular forces. I.CH3CH2CH2CH2CH2CH3 \quad II.(CH3) 3CCH3 \quad III.(CH3) 3CCH2CH3

Correct AnswerverifiedShow Answer

Place the following substances in order of increasing boiling point. CH3CH2OH \quad Ar \quad CH3OCH3

Correct AnswerverifiedShow Answer

At atmospheric pressure,dry ice ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the compound that does not have hydrogen bonding.

Correct AnswerverifiedShow Answer

Give the edge length in terms of r for a simple cubic cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The normal boiling point of water is ________.

Correct AnswerverifiedShow Answer

NaCl crystallizes in a cubic unit cell with Cl- ions on each corner and each face.How many Na+ and Cl- ions are in each unit cell of NaCl?

Correct AnswerverifiedShow Answer

How much energy is required to vaporize 158 g of butane (C4H10) at its boiling point if its ΔvapH is 24.3 kJ mol-1?

Correct AnswerverifiedShow Answer

Describe the difference between the conduction band and the valence band.

Correct AnswerverifiedThe valence band is the group of highest...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force.

Correct AnswerverifiedShow Answer

Which one of the following has a definite shape and volume?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the compound that does not have dipole-dipole forces as its strongest force.

Correct AnswerverifiedShow Answer

What is the strongest type of intermolecular force present in H2?

Correct AnswerverifiedShow Answer

Ethanol ( C₂H₅OH) melts at -114 °C.The enthalpy of fusion is 5.02 kJ mol^-1.The specific heats of solid and liquid ethanol are 0.97 J g^-1 °C^-1 and 2.3 J g^-1 °C^-1,respectively.How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -145 °C to liquid ethanol at -60 °C?

Correct Answer
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How much energy is required to vaporize 48.7 g of dichloromethane (CH₂Cl₂) at its boiling point if its Δ_vapH is 31.6 kJ mol^-1?

Correct Answer
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Place the following compounds in order of decreasing strength of intermolecular forces. I.CH₃CH₂CH₂CH₂CH₂CH₃ $\quad$ II.(CH₃) ₃CCH₃ $\quad$ III.(CH₃) ₃CCH₂CH₃

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Place the following substances in order of increasing boiling point. CH₃CH₂OH $\quad$ Ar $\quad$ CH₃OCH₃

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NaCl crystallizes in a cubic unit cell with Cl^- ions on each corner and each face.How many Na⁺ and Cl^- ions are in each unit cell of NaCl?

Correct Answer
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How much energy is required to vaporize 158 g of butane (C₄H₁₀) at its boiling point if its Δ_vapH is 24.3 kJ mol^-1?

Correct Answer
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The valence band is the group of highest...
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Which of the following substances would you predict to have the highest Δ_vapH?

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What is the strongest type of intermolecular force present in H₂?

Correct Answer
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