Questão 1
Questão
In water, the melting point is unusually high because of
Responda
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Ionic bonds in the individual molecules
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Hydrogen bonding between the molecules
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Covalent bonds in the individual molecules
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The heat content of the hydrogen-oxygen
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dipole-dipole attractions between the molecules
Questão 2
Questão
The main interactions between molecules of hydrogen chloride are examples of ____?
Questão 3
Questão
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?
Responda
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0 kJ
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5.4 kJ
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2.26 kJ
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1130 kJ
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11.3 kJ
Questão 4
Questão
Which of the following has dispersion forces as its only intermolecular force?
Responda
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NaCl
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CH3Cl
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CH4
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C6H13NH2
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HCl
Questão 5
Questão
Of the following _____ is an exothermic process.
Questão 6
Questão
Choose the substance with the highest vapor pressure at a given temperature.
Responda
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RbCl
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SiS2
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BF3
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SbH3
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CH3SCH3
Questão 7
Questão
The resistance of a liquid to flow is known as
Responda
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Viscosity
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Surface Tension
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Capillary action
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Intermolecular forces
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Meniscus
Questão 8
Questão
Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces?
Questão 9
Questão
The heat required to melt 1 mole of a solid is known as the
Responda
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heat of fusion
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critical point
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melting point
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heat of vaporization
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freezing point
Questão 10
Questão
Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?
Responda
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hydrogen bonding
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ion-dipole
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dipole-dipole
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dispersion forces
Questão 11
Questão
Which od the following expected to have the greatest viscosity?
Questão 12
Questão
Which of the following best explains why ∆Hvap is usually higher than ∆Hfusion?
Responda
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Vaporization involves the breaking of all forces between molecules.
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Vaporization occurs at high temperatures.
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Vaporization involves the breaking of bonds within molecules.
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Vaporization increases the entropy of molecules.
Questão 13
Questão
Which of the following compounds has the highest boiling point?
Responda
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CH3CH2OH
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HOCH2CH2OH
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CH3CH2CH2CH3
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H3C-O-CH3
Questão 14
Questão
Which of the following would be expected to have the highest surface tension?
Responda
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Br2
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CH3CH2CH3
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CH3CH2OH
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H3C-O-CH3
Questão 15
Questão
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?
Responda
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1584 kJ
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1703 kJ
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24.6 kJ
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2.28 kJ
Questão 16
Questão
Which of the following is NOT considered a property of a liquid?
Responda
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Boiling point
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Surface tension
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Viscosity
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Turbidity
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Vapor pressure
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Bubble count
Questão 17
Questão
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]
Responda
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Melting
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Vaporization
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Sublimation
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Condensation
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Freezing
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Deposition
Questão 18
Questão
Which of the following phase changes is endothermic?
Responda
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Melting
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Condensation
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Vaporization
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Freezing
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Sublimation
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Deposition
Questão 19
Questão
Which of the following phase changes is exothermic?
Responda
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Deposition
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Sublimation
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Vaporization
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Melting
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Condensation
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Freezing
Questão 20
Questão
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)
Questão 21
Questão
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)
Responda
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34.4 kJ
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35.5 kJ
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36.6 kJ
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37.7 kJ
Questão 22
Questão
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.
Responda
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4.11 kJ
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2.32 kJ
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7.68 kJ
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3.42 kJ
Questão 23
Questão
[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]
Responda
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Dipole-diploe attraction
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HCl
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Hydrogen bonding
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H2O
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London Dispersion forces
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CH3CH2CH2CH3
Questão 24
Questão
Label the phase change diagram at the following points.
Responda
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Solid
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Liquid
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Gas
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Triple Point
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Critical point
Questão 25
Questão
Normal melting and boiling point occur at what pressure?
Responda
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1 atm
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5 atm
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10 atm
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76 atm