Chapter 11: Liquids and Phase changes

Descripción

University Chemistry 102 Test sobre Chapter 11: Liquids and Phase changes, creado por Laura Pepe el 09/02/2020.
Laura Pepe
Test por Laura Pepe, actualizado hace más de 1 año
Laura Pepe
Creado por Laura Pepe hace casi 5 años
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Resumen del Recurso

Pregunta 1

Pregunta
In water, the melting point is unusually high because of
Respuesta
  • Ionic bonds in the individual molecules
  • Hydrogen bonding between the molecules
  • Covalent bonds in the individual molecules
  • The heat content of the hydrogen-oxygen
  • dipole-dipole attractions between the molecules

Pregunta 2

Pregunta
The main interactions between molecules of hydrogen chloride are examples of ____?
Respuesta
  • Dipole-dipole attractions
  • dispersion forces
  • covalent bonds
  • Ionic bonds
  • Hydrogen bonds

Pregunta 3

Pregunta
If the heat of vaporization for water is 2260 J/g, how many kilojoules are required to convert 5.00 g of liquid water at 100 °C to steam at 100 °C?
Respuesta
  • 0 kJ
  • 5.4 kJ
  • 2.26 kJ
  • 1130 kJ
  • 11.3 kJ

Pregunta 4

Pregunta
Which of the following has dispersion forces as its only intermolecular force?
Respuesta
  • NaCl
  • CH3Cl
  • CH4
  • C6H13NH2
  • HCl

Pregunta 5

Pregunta
Of the following _____ is an exothermic process.
Respuesta
  • Melting
  • Boiling
  • Freezing
  • Subliming
  • All of the above are exothermic

Pregunta 6

Pregunta
Choose the substance with the highest vapor pressure at a given temperature.
Respuesta
  • RbCl
  • SiS2
  • BF3
  • SbH3
  • CH3SCH3

Pregunta 7

Pregunta
The resistance of a liquid to flow is known as
Respuesta
  • Viscosity
  • Surface Tension
  • Capillary action
  • Intermolecular forces
  • Meniscus

Pregunta 8

Pregunta
Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces?
Respuesta
  • A
  • B
  • C
  • D
  • E

Pregunta 9

Pregunta
The heat required to melt 1 mole of a solid is known as the
Respuesta
  • heat of fusion
  • critical point
  • melting point
  • heat of vaporization
  • freezing point

Pregunta 10

Pregunta
Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?
Respuesta
  • hydrogen bonding
  • ion-dipole
  • dipole-dipole
  • dispersion forces

Pregunta 11

Pregunta
Which od the following expected to have the greatest viscosity?
Respuesta
  • C6H14
  • CH4
  • C5H12
  • C5H11OH

Pregunta 12

Pregunta
Which of the following best explains why ∆Hvap is usually higher than ∆Hfusion?
Respuesta
  • Vaporization involves the breaking of all forces between molecules.
  • Vaporization occurs at high temperatures.
  • Vaporization involves the breaking of bonds within molecules.
  • Vaporization increases the entropy of molecules.

Pregunta 13

Pregunta
Which of the following compounds has the highest boiling point?
Respuesta
  • CH3CH2OH
  • HOCH2CH2OH
  • CH3CH2CH2CH3
  • H3C-O-CH3

Pregunta 14

Pregunta
Which of the following would be expected to have the highest surface tension?
Respuesta
  • Br2
  • CH3CH2CH3
  • CH3CH2OH
  • H3C-O-CH3

Pregunta 15

Pregunta
Ethyl chloride, C2H5Cl, is used as a local anesthetic. It works by colling tissue as it vaporizes. The heat of vaporization is 26.4 kJ/mol. How much heat could be removed by 60.0 g of ethyl chloride?
Respuesta
  • 1584 kJ
  • 1703 kJ
  • 24.6 kJ
  • 2.28 kJ

Pregunta 16

Pregunta
Which of the following is NOT considered a property of a liquid?
Respuesta
  • Boiling point
  • Surface tension
  • Viscosity
  • Turbidity
  • Vapor pressure
  • Bubble count

Pregunta 17

Pregunta
Correctly identify the phase changes occurring in the following: Solid to liquid = [blank_start]Melting[blank_end] Liquid to gas = [blank_start]Vaporization[blank_end] Solid to gas = [blank_start]Sublimation[blank_end] Gas to liquid = [blank_start]Condensation[blank_end] Liquid to solid = [blank_start]Freezing[blank_end] Gas to solid = [blank_start]Deposition[blank_end]
Respuesta
  • Melting
  • Vaporization
  • Sublimation
  • Condensation
  • Freezing
  • Deposition

Pregunta 18

Pregunta
Which of the following phase changes is endothermic?
Respuesta
  • Melting
  • Condensation
  • Vaporization
  • Freezing
  • Sublimation
  • Deposition

Pregunta 19

Pregunta
Which of the following phase changes is exothermic?
Respuesta
  • Deposition
  • Sublimation
  • Vaporization
  • Melting
  • Condensation
  • Freezing

Pregunta 20

Pregunta
Q=MC∆T Where Q is the specific heat M is mass in moles C is heat capacity ∆T is change in temperature (in celsius or kelvin)
Respuesta
  • True
  • False

Pregunta 21

Pregunta
How much energy (kJ) is released when 15.3 grams of steam at 115.0 °C is condensed to give liquid water at 75 °C? Hvap of liquid water is 40.67 kJ/mol Heat capacity of liquid= 75.3 J/(K⋅mol) Heat capacity of vapor= 33.6 J/(K⋅mol)
Respuesta
  • 34.4 kJ
  • 35.5 kJ
  • 36.6 kJ
  • 37.7 kJ

Pregunta 22

Pregunta
How much energy in kilojoules is needed to heat 4.65 g of ice from -11.5 ∘C to 34.0 ∘C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.4 J/(K⋅mol) for liquid water.
Respuesta
  • 4.11 kJ
  • 2.32 kJ
  • 7.68 kJ
  • 3.42 kJ

Pregunta 23

Pregunta
[blank_start]Dipole-diploe attraction[blank_end] --> The attraction of one polar molecule for another Example of this would be [blank_start]HCl[blank_end] [blank_start]Hydrogen bonding[blank_end] --> special dipole-dipole where the hydrogen attaches to a F, N, or O. Very strong. Example of this would be [blank_start]H2O[blank_end] [blank_start]London Dispersion forces[blank_end] --> Stronger for larger molecules, but typically weak and abundant. Example of this would be [blank_start]CH3CH2CH2CH3[blank_end]
Respuesta
  • Dipole-diploe attraction
  • HCl
  • Hydrogen bonding
  • H2O
  • London Dispersion forces
  • CH3CH2CH2CH3

Pregunta 24

Pregunta
Label the phase change diagram at the following points.
Respuesta
  • Solid
  • Liquid
  • Gas
  • Triple Point
  • Critical point

Pregunta 25

Pregunta
Normal melting and boiling point occur at what pressure?
Respuesta
  • 1 atm
  • 5 atm
  • 10 atm
  • 76 atm
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