Question 1

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point,if its ΔHvap is 40.5 kJ/mol?

Accepted Answer

A)   86.7 kJ
B)   11.5 kJ
C)   18.9 kJ
D)   52.8 kJ
E)   39.9 kJ

Question 2

Which of the following compounds exhibits hydrogen bonding?

Accepted Answer

A)   CH3Br
B)   HCl 
C)   CH3SCH3
D)   CH3OH

Question 3

Identify the place which has the highest boiling point of water.

Accepted Answer

A)   Death Valley, 282 feet below sea level
B)   A pressurized passenger jet, 39,000 feet
C)   Panama City, Florida, sea level
D)   Mt. Everest, 29,035 feet
E)   Denver, Colorado, 5,280 feet

Question 4

Define fusion.

Accepted Answer

A)   the phase transition from solid to liquid
B)   the phase transition from gas to solid
C)   the phase transition from gas to liquid
D)   the phase transition from liquid to gas
E)   the phase transition from liquid to solid

Question 5

Define dynamic equilibrium.

Accepted Answer

Dynamic equilibrium ...

Question 6

The melting point of water is ________.

Accepted Answer

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

Question 7

Identify the compound that does NOT have hydrogen bonding.

Accepted Answer

A)   (CH3) 2N(CH2) 3CH3
B)   H2O
C)   CH3(CH2) 5
D)   HF
E)   CH3(CH2) 2NH2

Question 8

Place the following substances in order of increasing boiling point. He I2 O2

Accepted Answer

A)   He 2  2
B)   I2 2  
C)   O2 2  
D)   I2 2
E)   He 2  2

Question 9

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Accepted Answer

A)   4.09 kJ
B)   170 kJ
C)   264 kJ
D)   1700 kJ

Question 10

Describe sweating in humans.

Accepted Answer

A)   It is an endothermic reaction.
B)   The sweat evaporates absorbing heat from the body.
C)   The skin is cooled.
D)   None of the above
E)   All of the above

Question 11

How many compounds,of the ones listed below,have hydrogen bonding? CH3(CH2) 2NH2 CH3(CH2) 2NH(CH2) 4CH3 (CH3CH2) 2N(CH2) 4CH3

Accepted Answer

A)   2
B)   3
C)   1
D)   0

Question 12

Define deposition.

Accepted Answer

A)   A liquid becomes a gas.
B)   A gas becomes a liquid.
C)   A gas becomes a solid.
D)   A solid becomes a gas.
E)   A solid becomes a liquid.

Question 13

Explain why ice floats in water.

Accepted Answer

A)   Ice is more dense than water.
B)   Steam is less dense than water.
C)   Ice is less dense than water.
D)   Steam is more dense than water.
E)   Ice is the same density as water.

Question 14

The forces between polar molecules are known as

Accepted Answer

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

Question 15

Place the following substances in order of decreasing boiling point. He Ar H2

Accepted Answer

A)   He > H2  > Ar
B)   H2 > He > Ar
C)   He > Ar > H2
D)   Ar > He > H2
E)   H2 > Ar > He

Question 16

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

Accepted Answer

A)   Cl2
B)   CO
C)   HBr
D)   NaCl
E)   All of these have intermolecular forces stronger than dispersion.

Question 17

Place the following substances in order of decreasing vapor pressure at a given temperature. BeF2 CH3OH OF2

Accepted Answer

A)   CH3OH > OF2  > BeF2
B)   BeF2 > OF2  > CH3OH
C)   OF2 > CH3OH > BeF2
D)   OF2 > BeF2 > CH3OH
E)   BeF2 > CH3OH > OF2

Question 18

Which of the following statements is FALSE?

Accepted Answer

A)   The rate of vaporization increases with increasing surface area.
B)   The rate of vaporization increases with decreasing strength of intermolecular forces.
C)   The rate of vaporization increases with increasing temperature.
D)   Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces.
E)   None of the above is false.

Question 19

Determine ΔHvap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.

Accepted Answer

A)   41 kJ/mol
B)   79 kJ/mol
C)   24 kJ/mol
D)   13 kJ/mol
E)   34 kJ/mol

Question 20

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

Accepted Answer

A)   CH2I2
B)   CH3OCH3
C)   CH3Cl
D)   HCBr3
E)   CO2

Exam 11: Liquids,solids,and Intermolecular Forces

Which of the following compounds exhibits hydrogen bonding?

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Explain why ice floats in water.

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Define dynamic equilibrium.

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

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Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Correct AnswerverifiedShow Answer

Define fusion.

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How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point,if its ΔHvap is 40.5 kJ/mol?

Correct AnswerverifiedShow Answer

Describe sweating in humans.

Correct AnswerverifiedShow Answer

The forces between polar molecules are known as

Correct AnswerverifiedShow Answer

Determine ΔHvap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.

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

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Place the following substances in order of decreasing boiling point. He Ar H2

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Identify the compound that does NOT have hydrogen bonding.

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Place the following substances in order of increasing boiling point. He I2 O2

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How many compounds,of the ones listed below,have hydrogen bonding? CH3(CH2) 2NH2 CH3(CH2) 2NH(CH2) 4CH3 (CH3CH2) 2N(CH2) 4CH3

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Place the following substances in order of decreasing vapor pressure at a given temperature. BeF2 CH3OH OF2

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Define deposition.

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Identify the place which has the highest boiling point of water.

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Which of the following statements is FALSE?

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The melting point of water is ________.

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Dynamic equilibrium ...
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Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Correct Answer
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Correct Answer
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How much energy is required to vaporize 98.6 g of ethanol (C₂H₅OH) at its boiling point,if its ΔH_vap is 40.5 kJ/mol?

Correct Answer
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Correct Answer
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Determine ΔH_vap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.

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Place the following substances in order of decreasing boiling point. He Ar H₂

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Place the following substances in order of increasing boiling point. He I₂O₂

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How many compounds,of the ones listed below,have hydrogen bonding? CH₃(CH₂) ₂NH₂ CH₃(CH₂) ₂NH(CH₂) ₄CH₃ (CH₃CH₂) ₂N(CH₂) ₄CH₃

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Place the following substances in order of decreasing vapor pressure at a given temperature. BeF₂ CH₃OH OF₂

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