Question 1

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.

Question 2

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 3

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.

Question 4

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

Question 5

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

Question 6

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.

Question 7

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

Question 8

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

Question 9

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

Question 10

Identify the substance with the highest viscosity.

Accepted Answer

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

Question 11

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

Question 12

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

Question 13

The enthalpy change for converting 1.00 mol of ice at -25.0°C to water at 60.0°C is 2O,ΔHfus = 6.01 kJ/mol,and ΔHvap = 40.67 kJ/mol. A)  12.28 B)  6.31 C)  11.46 D)  5461 E)  9.58" class="answers-bank-image d-inline" rel="preload" > 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

Question 14

Which is expected to have the largest dispersion forces?

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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.

Question 17

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

Question 18

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.

Question 19

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

Question 20

At atmospheric pressure,ice

Accepted Answer

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

Exam 11: Liquids,solids,and Intermolecular Forces

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

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

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Which is expected to have the largest dispersion forces?

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

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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

Correct AnswerverifiedSketch should includ...View AnswerShow Answer

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?

Correct AnswerverifiedShow Answer

At atmospheric pressure,ice

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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.

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

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

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

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

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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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the characteristics of a liquid.

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

Correct AnswerverifiedShow Answer

Identify the substance with the highest viscosity.

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On a phase diagram,the fusion curve is between

Correct AnswerverifiedShow Answer

The two strands in DNA are held together by

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

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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

Correct Answer
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Sketch should includ...
View Answer

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?

Correct Answer
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Correct Answer
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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.

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

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