Chapter 11: Liquids and Phase changes

Laura Pepe
Quiz by Laura Pepe, updated more than 1 year ago
Laura Pepe
Created by Laura Pepe over 1 year ago
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University Chemistry 102 Quiz on Chapter 11: Liquids and Phase changes, created by Laura Pepe on 02/09/2020.

Resource summary

Question 1

Question
In water, the melting point is unusually high because of
Answer
  • 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

Question 2

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

Question 3

Question
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?
Answer
  • 0 kJ
  • 5.4 kJ
  • 2.26 kJ
  • 1130 kJ
  • 11.3 kJ

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

Question 9

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

Question 10

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

Question 11

Question
Which od the following expected to have the greatest viscosity?
Answer
  • C6H14
  • CH4
  • C5H12
  • C5H11OH

Question 12

Question
Which of the following best explains why ∆Hvap is usually higher than ∆Hfusion?
Answer
  • 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.

Question 13

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

Question 14

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

Question 15

Question
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?
Answer
  • 1584 kJ
  • 1703 kJ
  • 24.6 kJ
  • 2.28 kJ

Question 16

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

Question 17

Question
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]
Answer
  • Melting
  • Vaporization
  • Sublimation
  • Condensation
  • Freezing
  • Deposition

Question 18

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

Question 19

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

Question 20

Question
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)
Answer
  • True
  • False

Question 21

Question
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)
Answer
  • 34.4 kJ
  • 35.5 kJ
  • 36.6 kJ
  • 37.7 kJ

Question 22

Question
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.
Answer
  • 4.11 kJ
  • 2.32 kJ
  • 7.68 kJ
  • 3.42 kJ

Question 23

Question
[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]
Answer
  • Dipole-diploe attraction
  • HCl
  • Hydrogen bonding
  • H2O
  • London Dispersion forces
  • CH3CH2CH2CH3

Question 24

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

Question 25

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