• CHEM101_MH_V4
• Topic 11: Modern Materials
Started on Friday, April 15, 2022, 8:10 PM
State Finished
Completed on Friday, April 15, 2022, 8:31
... [Show More] PM
Time taken 20 mins 58 secs
Grade 115.00 out of 115.00 (100%)
Question 1
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Which substance has the highest vapor pressure at room temperature?
Select one:
a. HF
b. HCl
c. HBr
d. HI
e. All of these substances have the same vapor pressure at room temperature.
Question 2
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Choose the response that lists the member of each of the following pairs that has the higher boiling point.
I. H2O or KI, II. HF or HI, III. Cl2 or Br2
Select one:
a. H2O, HF, and Cl2
b. KI, HF, and Br2
c. KI, HI, and Br2
d. H2O, HI, and Cl2
e. KI, HF, and Cl2
Question 3
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Which of the following is defined as the attractive forces between polar molecules?
I. dispersion forces
II. dipole-dipole interactions
III. ion-dipole interactions
Select one:
a. I and III
b. II only
c. III only
d. I, II, and III
e. I only
Question 4
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What is the name given for the attraction between unlike molecules involved in capillary action?
Select one:
a. Adhesion
b. Ionization
c. Cohesion
d. Surface tension
e. Viscosity
Question 5
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Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.
Select one:
a. C7H16, C5H12
b. CCl4, CBr4
c. H2O, H2S
d. CH3CH2OH, CH3–O–CH3
e. Xe, Kr
Question 6
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Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of a platinum atom?
Select one:
a. 69 pm
b. 98 pm
c. 139 pm
d. 196 pm
e. 277 pm
Question 7
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Which corresponds to the temperature-dependent partial pressure above the surface of a liquid?
Select one:
a. Surface tension
b. Vapor pressure
c. Boiling point
d. Viscosity
e. Capillary action
Question 8
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Use the following data to determine the molar heat of vaporization of chlorine gas.
(R = 8.314 J/K • mol)
T (°C) –84.5 –71.2 –47.3
P (mmHg) 40.0 100.0 400.0
Select one:
a. 34.7 kJ/mol
b. 21.9 kJ/mol
c. 3.45 kJ/mol
d. 712 J/mol
e. 9.99 kJ/mol
Question 9
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Based on the phase diagram of a pure substance given below, what phase exists at point F?
Select one:
a. vapor + liquid
b. vapor
c. liquid
d. solid
e. supercritical fluid
Question 10
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What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×105 J of heat from the surface of your body?
H2O(l) → H2O(g) ΔHvap = 40.7 kJ/mol
Select one:
a. 2.26 g
b. 4.18 g
c. 75.2 g
d. 4.18 ×103 g
e. 4.07 × 104 g
Question 11
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Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?
Select one:
a. 4
b. 6
c. 8
d. 10
e. 12
Question 12
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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 13
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An amino acid is a compound that contains at least
Select one:
a. one amino group and one amide group.
b. two amino groups and one carboxylic acid group.
c. one hydroxyl group and one methyl group.
d. one carboxylic acid group and one amino group.
e. one methyl group and one amide group.
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 choices is the general structural formula of an amino acid?
Select one:
a.
b. R–CH2–NH2
c.
d.
Question 16
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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 17
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The segment
represents the polymer named
Select one:
a. polyethylene.
b. polyvinyl chloride.
c. polystyrene.
d. polybutylene.
e. polypropylene.
Question 18
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The polymer formed from the monomer CH2=CH–CN is
Select one:
a. .
b. (CH2=CHCN)n.
c. (CH2=CH=CN)n.
d. .
Question 19
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Most high-temperature superconducting materials are
Select one:
a. metals.
b. metal chlorides.
c. polymers.
d. fullerenes.
e. ceramics.
Question 20
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Which is NOT an example of a block copolymer formed between monomers A and B?
Select one:
a. -A-A-B-B-B-A-A-B-B-B-
b. -A-B-A-B-A-B-A-B-A-B-
c. -A-A-A-B-B-B-A-A-A-B-B-B-
d. -A-A-A-B-B-A-A-A-B-B-
e. -B-B-A-A-B-B-A-A-B-B-
Question 21
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Which of the following polymers is a condensation polymer?
Select one:
a. Polystyrene
b. Teflon®
c. Polyvinylchloride
d. Polypropylene
e. Dacron®
Question 22
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Polyacrylonitrile, characterized by the following repeating unit, is made from which of these monomers?
Select one:
a. CH3CH2CN
b. HOCH2CH2CH3
c. CH3CH=CHCN
d. CH2=CHCN
e. CH2=CNCH3
Question 23
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Which monomer, when polymerized, results in the polymer polystyrene?
Select one:
a. CF2=CF2
b. CCl2=CF2
c. C6H5–CH=CH2
d. CH3CH=CH2
e. CH3CH=CH2CH3
Question 24
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What is the name given to the polymers that can be melted and reshaped or heated and bent?
Select one:
a. Flex polymers
b. Thermal polymers
c. T-polymers
d. Thermoplastic polymers
e. Thermosetting polymers
Question 25
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Which one of these materials is a copolymer?
Select one:
a. Styrene-butadiene
b. Polyvinyl chloride
c. Polypropylene
d. Poly-cis-isoprene
e. Polyethylene [Show Less]