1)Choose the packing scheme that gives the highest density of spheres. Simple cu
ID: 497063 • Letter: 1
Question
1)Choose the packing scheme that gives the highest density of spheres.
Simple cubic packing
Trigonal close packing
Hexagonal close packing
Body-centered cubic packing
2)Choose the monomers used to synthesize Teflon.
Adipic acid and hexamethylenediamine
Tetrafluoroethylene
1,3-Butadiene and styrene
Vinyl acetate
3)Vulcanization
Crosslinks polymer chains to improve elasticity
Occurs when plastics are molded into a rigid form with high heat
Breaks long polymer chains into shorter ones
None of the Above
4) Select the general class of compounds you would expect to have the highest boiling point.
Alkanes
Ketones
Alcohols
Ethers
5) Choose the substance with the greatest surface tension.
C9H20
C20H42
C5H12
C12H26
6) Which species below has the strongest intermolecular forces?
CH3CH3
CH3CH2CH2CH3
CH3CH2CH3
CH4
7) What is the strongest intermolecular force present in acetone, (CH3)2CO ?
London forces
Dipole-dipole forces
Ionic bonding
Hydrogen bonding
8) Choose the doping material that will cause silicon to become a n-type semiconductor.
As
C
B
Ga
9) Choose the material that is brittle, a poor thermal conductor, a good thermal insulator, and can withstand high temperatures.
Ceramics
Polymers
Metals
Composites
10) Osmium has a density of 22.6 g/mL. Calculate the radius of an Os atom expected if osmium crystallizes in the face-centered cubic structure.
701 pm
103 pm
135 pm
338 pm
Explanation / Answer
1)Choose the packing scheme that gives the highest density of spheres.
Simple cubic packing
Trigonal close packing
Hexagonal close packing
Body-centered cubic packing
Answer = Hexagonal close packing
2)Choose the monomers used to synthesize Teflon.
Adipic acid and hexamethylenediamine
Tetrafluoroethylene
1,3-Butadiene and styrene
Vinyl acetate
Answer = Tetrafluoroethylene
3)Vulcanization
Crosslinks polymer chains to improve elasticity
Occurs when plastics are molded into a rigid form with high heat
Breaks long polymer chains into shorter ones
None of the Above
Answer = Crosslinks polymer chains to improve elasticity
4) Select the general class of compounds you would expect to have the highest boiling point.
Alkanes
Ketones
Alcohols
Ethers
Answer = Alcohols
5) Choose the substance with the greatest surface tension.
C9H20
C20H42
C5H12
C12H26
Answer = C12H26
6) Which species below has the strongest intermolecular forces?
CH3CH3
CH3CH2CH2CH3
CH3CH2CH3
CH4
Answer = CH3CH2CH2CH3
7) What is the strongest intermolecular force present in acetone, (CH3)2CO ?
London forces
Dipole-dipole forces
Ionic bonding
Hydrogen bonding
Answer = Dipole-dipole forces
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