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• CHEM101_MH_V4
• Topic 11: Modern Materials
Started on Saturday, March 26, 2022, 12:57 AM
State Finished
Completed on Saturday, March
... [Show More] 26, 2022, 1:29 AM
Time taken 31 mins 47 secs
Grade 96.60 out of 115.00 (84%)
Question 1
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How much energy (heat) is required to convert 52.0 g of ice at –10.0°C to steam at 100°C?
Specific heat of ice 2.09 J/g • °C
Specific heat of water 4.18 J/g • °C
Specific heat of steam 1.84 J/g • °C
Molar heat of fusion 6.02 kJ/mol
Molar heat of vaporization 40.7 kJ/mol
Select one:
a. 12.0 kJ
b. 23.0 kJ
c. 46.4 kJ
d. 158 kJ
e. 2.30 ×104 kJ
Question 2
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The vapor pressure of ethanol is 400. mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9°C? (R = 8.314 J/K • mol)
Select one:
a. 109 mmHg
b. 220 mmHg
c. 366 mmHg
d. 376 mmHg
e. 1470 mmHg
Question 3
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Which of the following statements is true?
Select one:
a. The higher the viscosity, the faster a liquid flows.
b. The viscosity increases with increasing temperature.
c. The stronger the intermolecular forces, the higher the viscosity.
d. Hydrogen bonding in water gives rise to its unusually low viscosity.
e. The viscosity of gases is larger than the viscosity of liquids.
Question 4
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What is another name given to dispersion forces?
Select one:
a. ion-dipole interactions
b. dipole-dipole interactions
c. hydrogen bonding
d. covalent forces
e. London forces
Question 5
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Which of the following atoms does not participate in hydrogen bonding?
Select one:
a. S
b. O
c. F
d. N
e. H
Question 6
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Which substance should exhibit hydrogen bonding in the liquid phase?
Select one:
a. PH3
b. He
c. H2S
d. CH4
e. CH3OH
Question 7
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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
Select one:
a. 4.92 kJ
b. 16.0 kJ
c. 34.5kJ
d. 39.4 kJ
e. 182.8kJ
Question 8
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Octane has a vapor pressure of 40. torr at 45.1°C and 400. torr at 104.0°C. What is its heat of vaporization? (R = 8.314 J/K • mol)
Select one:
a. 39.1 kJ/mol
b. 46.0 kJ/mol
c. 590 kJ/mol
d. 710 kJ/mol
e. None of these choices is correct.
Question 9
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Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are
Select one:
a. dipole-dipole forces.
b. London dispersion forces.
c. hydrogen bonding.
d. covalent bonds.
e. carbon-hydrogen bonds.
Question 10
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The location that indicates conditions under which two phases can exist in equilibrium is called the
Select one:
a. triple point.
b. critical point.
c. phase boundary.
d. phase diagram.
e. transition state.
Question 11
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What is defined as the number of atoms surrounding an atom in a crystal lattice and indicates how tightly the atoms are packed together?
Select one:
a. the unit cell
b. the radius of the cubic cell
c. the coordination number
d. the area of the cubic cell
e. the atoms themselves
Question 12
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Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?
Select one:
a. 4
b. 6
c. 8
d. 10
e. 12
Question 13
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Which one of these choices is the general structural formula of an amino acid?
Select one:
a.
b. R–CH2–NH2
c.
d.
Question 14
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A peptide bond (also called an amide bond) joins two amino acids together. What atoms are linked by this bond?
Select one:
a. C — O
b. C — H
c. C — N
d. N — S
e. S — C
Question 15
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Which one of these elements is not found in proteins?
Select one:
a. S
b. P
c. C
d. O
e. N
Question 16
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The functional group
found in proteins is called a (an)
Select one:
a. amide.
b. carboxylic acid.
c. amine.
d. amino acid.
e. dipeptide.
Question 17
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A polymer made in a polymerization reaction that produces small molecules (such as water) as well as the polymer is classified as a/an _______ polymer.
Select one:
a. addition
b. natural
c. condensation
d. elimination
e. copolymer
Question 18
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What is meant by HIPS?
Select one:
a. High polysaccharides
b. High in polysaccharides
c. Highly ionic polymer solution
d. High-impact polystyrene
e. Highly ionic protein solution
Question 19
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What is the name of the industrial process in which sulfur (S8) is used to create linkages between individual polymer chains in rubber?
Select one:
a. Rubberization
b. Vulcanization
c. Smelting
d. Sulfonafication
e. Sulfonation
Question 20
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Materials with no resistance to the flow of electrons are called
Select one:
a. conductors.
b. insulators.
c. superconductors.
d. semiconductors.
e. nonconductors.
Question 21
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Which of the following polymers is used in plastic food bags and wraps?
Select one:
a. LDPE
b. PVC
c. Polystyrene
d. HDPE
e. Polypropylene
Question 22
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Which of the following is a synthetic polymer?
Select one:
a. cellulose
b. polyisoprene
c. DNA
d. poly(hexamethyleneadipamide)
e. enzymes
Question 23
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What is the process called that produces particles of nearly uniform size that are much more likely to produce a solid ceramic without gaps or cracks?
Select one:
a. Sintering
b. Roasting
c. Firing
d. Stonewaring
e. Sol-gel
Question 24
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Which of the following is a medical application using polymers?
Select one:
a. Implants
b. Prosthetics
c. Wound dressings
d. All of these choices are correct
e. None of these choices is correct.
Question 25
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What name is given to the polymers whose shape is determined as part of the chemical process that formed the polymer?
Select one:
a. Flex polymers
b. Thermal polymers
c. T-polymers
d. Thermoplastic polymers
e. Thermosetting polymers [Show Less]