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 ____?
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.
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?
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?
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)
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