Question 1

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 line 
A) liquid 
B) vapor 
C) rhombic solid 
D) monoclinic solid 
E) liquid-vapor boundary line

Question 2

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

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. 
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.

Question 4

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) 12 
A) 4 
B) 6 
C) 8 
D) 10 
E) 12

Question 5

______________ 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 6

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 condensation 
A) molar heat of freezing 
B) molar heat of fission 
C) molar heat of vaporization 
D) molar heat of fusion 
E) molar heat of condensation

Question 7

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

Question 8

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 point 
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 point

Question 9

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

Question 10

Which substance should exhibit hydrogen bonding in the liquid phase?

Accepted Answer

A) PH3 
B) He 
C) H2S 
D) CH4 
E) CH3OH 
A) PH3 
B) He 
C) H2S 
D) CH4 
E) CH3OH

Question 11

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

Question 12

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

Accepted Answer

A)    
B) PH3,NH3 
C) CF4,CBr4 
D) C3H8,C4H10 
E) F2,Cl2 
A)    
B) PH3,NH3 
C) CF4,CBr4 
D) C3H8,C4H10 
E) F2,Cl2

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 8. 
A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 8.

Question 15

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. 
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.

Question 16

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. 
A) dipole-dipole forces. 
B) London dispersion forces. 
C) hydrogen bonding. 
D) ion-dipole interactions. 
E) disulfide linkages.

Question 17

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 fluid 
A) vapor + liquid 
B) vapor 
C) liquid 
D) solid 
E) supercritical fluid

Question 18

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

Question 19

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

Accepted Answer

A) Surface tension 
B) Adhesion 
C) Polarity 
D) Viscosity 
E) Cohesion 
A) Surface tension 
B) Adhesion 
C) Polarity 
D) Viscosity 
E) Cohesion

Question 20

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

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

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

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

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

A liquid boils when its

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

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

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

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

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

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

Which substance should exhibit hydrogen bonding in the liquid phase?

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

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

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

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

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

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

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

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

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

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

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

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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

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

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

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