Question 1

Based on the phase diagram of a pure substance given below,which statement is true?

Accepted Answer

A)  The solid phase has a lower density than the liquid phase.
B)  The triple point is at a higher temperature than the normal melting point.
C)  The substance changes from a solid to a liquid as one follows the line from C to D.
D)  The substance changes from a liquid to a gas as one follows the line from C to D.
E)  Point B represents the critical temperature and pressure for the substance.F) A) and E)
G) A) and C)

Question 2

What name is given to the curved surface of a liquid contained in a narrow tube?

Accepted Answer

A)  Surface tension
B)  Adhesion point
C)  Meniscus
D)  Capillary point
E)  Cohesion pointF) C) and D)
G) D) and E)

Question 3

A liquid boils when its

Accepted Answer

A)  vapor pressure is exactly 1 atmosphere.
B)  vapor pressure is equal to or greater than the external pressure.
C)  temperature is equal to 273 K (standard temperature) .
D)  temperature is greater than room temperature.
E)  thermal energy is equal to the heat of vaporization.F) All of the above
G) A) and D)

Question 4

Which substance should exhibit hydrogen bonding in the liquid phase?

Accepted Answer

A)  PH3
B)  He
C)  H2S
D)  CH4
E)  CH3OHF) A) and C)
G) B) and D)

Question 5

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×105 J of heat from the surface of your body? H2O(l) → H2O(g) ΔHvap = 40.7 kJ/mol

Accepted Answer

A)  2.26 g
B)  4.18 g
C)  75.2 g
D)  4.18 ×103 g
E)  4.07 × 104 gF) C) and E)
G) D) and E)

Question 6

What is the attractive force between like molecules involved in capillary action?

Accepted Answer

A)  Surface tension
B)  Adhesion
C)  Polarity
D)  Viscosity
E)  CohesionF) B) and C)
G) B) and E)

Question 7

Below is the phase diagram for sulfur.Which phase is present at 100°C and 1 atm?

Accepted Answer

A)  liquid
B)  vapor
C)  rhombic solid
D)  monoclinic solid
E)  liquid-vapor boundary lineF) A) and D)
G) A) and C)

Question 8

Based on the phase diagram of a pure substance given below,what phase exists at point F?

Accepted Answer

A)  vapor + liquid
B)  vapor
C)  liquid
D)  solid
E)  supercritical fluidF) A) and B)
G) All of the above

Question 9

The surface tension of water is lowered when a detergent is present in solution.

Accepted Answer

A) True 
 B)False

Question 10

Liquid ammonia can be used as a refrigerant and heat transfer fluid.How much energy is required to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C? Normal boiling point -33.4°C
Specific heat of NH3(l) 4.7 J/g • °C
Specific heat of NH3(g) 2.2 J/g • °C
Molar heat of vaporization 23.5 kJ/mol

Accepted Answer

A)  4.92 kJ
B)  16.0 kJ
C)  34.5kJ
D)  39.4 kJ
E)  182.8kJF) A) and E)
G) B) and D)

Question 11

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

Accepted Answer

A)  a low heat of vaporization
B)  a low critical temperature
C)  a low vapor pressure
D)  a low boiling point
E)  a low melting pointF) A) and B)
G) B) and E)

Question 12

The strongest intermolecular interactions between pentane (C5H12) molecules arise from

Accepted Answer

A)  dipole-dipole forces.
B)  London dispersion forces.
C)  hydrogen bonding.
D)  ion-dipole interactions.
E)  carbon-carbon bonds.F) B) and D)
G) B) and E)

Question 13

The number of atoms in a face-centered cubic unit cell is

Accepted Answer

A)  1.
B)  2.
C)  3.
D)  4.
E)  8.F) None of the above
G) A) and B)

Question 14

Which is not a valid phase diagram for a pure substance?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) D) and E)
G) All of the above

Question 15

What is the energy in kJ/mol required to melt 1 mole of a solid?

Accepted Answer

A)  molar heat of freezing
B)  molar heat of fission
C)  molar heat of vaporization
D)  molar heat of fusion
E)  molar heat of condensationF) C) and E)
G) C) and D)

Question 16

Iron crystallizes in the body-centered cubic lattice.What is the coordination number for Fe?

Accepted Answer

A)  4
B)  6
C)  8
D)  10
E)  12F) A) and E)
G) A) and B)

Question 17

What is the intermolecular force that exists between a calcium ion and water?

Accepted Answer

A)  dipole-dipole forces
B)  London dispersion forces
C)  ion-dipole forces
D)  covalent bonding
E)  ion-ion forcesF) D) and E)
G) A) and B)

Question 18

The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from

Accepted Answer

A)  dipole-dipole forces.
B)  London dispersion forces.
C)  hydrogen bonding.
D)  ion-dipole interactions.
E)  disulfide linkages.F) None of the above
G) A) and B)

Question 19

______________ is the name given to the phase change from a gas directly to a liquid.

Accepted Answer

The answer of ______________ is the name given to the...

Question 20

Select the pair of substances in which the one with the lower vapor pressure at a given temperature is listed first.

Accepted Answer

A)   3,NH3 
C)  CF4,CBr4 
D)  C3H8,C4H10 
E)  F2,Cl2" class="answers-bank-image d-inline" rel="preload" >
B)  PH3,NH3
C)  CF4,CBr4
D)  C3H8,C4H10
E)  F2,Cl2F) C) and E)
G) D) and E)

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

The surface tension of water is lowered when a detergent is present in solution.

Correct Answer
verified

Based on the phase diagram of a pure substance given below,which statement is true?

Correct Answer
verified

Iron crystallizes in the body-centered cubic lattice.What is the coordination number for Fe?

Correct Answer
verified

Below is the phase diagram for sulfur.Which phase is present at 100°C and 1 atm?

Correct Answer
verified

Based on the phase diagram of a pure substance given below,what phase exists at point F?

Correct Answer
verified

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×10⁵ J of heat from the surface of your body? H₂O(l) → H₂O(g) ΔH_vap = 40.7 kJ/mol

Correct Answer
verified

What is the attractive force between like molecules involved in capillary action?

Correct Answer
verified

Which is not a valid phase diagram for a pure substance?

Correct Answer
verified

The strongest intermolecular interactions between pentane (C₅H₁₂) molecules arise from

Correct Answer
verified

Select the pair of substances in which the one with the lower vapor pressure at a given temperature is listed first.

Correct Answer
verified

The number of atoms in a face-centered cubic unit cell is

Correct Answer
verified

Correct Answer
verified

______________ is the name given to the phase change from a gas directly to a liquid.

Correct Answer
verified

What is the intermolecular force that exists between a calcium ion and water?

Correct Answer
verified

A liquid boils when its

Correct Answer
verified

What name is given to the curved surface of a liquid contained in a narrow tube?

Correct Answer
verified

Which substance should exhibit hydrogen bonding in the liquid phase?

Correct Answer
verified

What is the energy in kJ/mol required to melt 1 mole of a solid?

Correct Answer
verified

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

Correct Answer
verified

The strongest intermolecular interactions between hydrogen sulfide (H₂S) molecules arise from

Correct Answer
verified

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

The surface tension of water is lowered when a detergent is present in solution.

Correct AnswerverifiedShow Answer

Based on the phase diagram of a pure substance given below,which statement is true?

Correct AnswerverifiedShow Answer

Iron crystallizes in the body-centered cubic lattice.What is the coordination number for Fe?

Correct AnswerverifiedShow Answer

Below is the phase diagram for sulfur.Which phase is present at 100°C and 1 atm?

Correct AnswerverifiedShow Answer

Based on the phase diagram of a pure substance given below,what phase exists at point F?

Correct AnswerverifiedShow Answer

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×105 J of heat from the surface of your body? H2O(l) → H2O(g) ΔHvap = 40.7 kJ/mol

Correct AnswerverifiedShow Answer

What is the attractive force between like molecules involved in capillary action?

Correct AnswerverifiedShow Answer

Which is not a valid phase diagram for a pure substance?

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between pentane (C5H12) molecules arise from

Correct AnswerverifiedShow Answer

Select the pair of substances in which the one with the lower vapor pressure at a given temperature is listed first.

Correct AnswerverifiedShow Answer

The number of atoms in a face-centered cubic unit cell is

Correct AnswerverifiedShow Answer

Liquid ammonia can be used as a refrigerant and heat transfer fluid.How much energy is required to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C? Normal boiling point -33.4°C Specific heat of NH3(l) 4.7 J/g • °C Specific heat of NH3(g) 2.2 J/g • °C Molar heat of vaporization 23.5 kJ/mol

Correct AnswerverifiedShow Answer

______________ is the name given to the phase change from a gas directly to a liquid.

Correct AnswerverifiedShow Answer

What is the intermolecular force that exists between a calcium ion and water?

Correct AnswerverifiedShow Answer

A liquid boils when its

Correct AnswerverifiedShow Answer

What name is given to the curved surface of a liquid contained in a narrow tube?

Correct AnswerverifiedShow Answer

Which substance should exhibit hydrogen bonding in the liquid phase?

Correct AnswerverifiedShow Answer

What is the energy in kJ/mol required to melt 1 mole of a solid?

Correct AnswerverifiedShow Answer

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×10⁵ J of heat from the surface of your body? H₂O(l) → H₂O(g) ΔH_vap = 40.7 kJ/mol

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The strongest intermolecular interactions between pentane (C₅H₁₂) molecules arise from

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The strongest intermolecular interactions between hydrogen sulfide (H₂S) molecules arise from

Correct Answer
verified