Question 1

Identify a use for cement.

Accepted Answer

A)   beakers
B)   bridges
C)   furniture
D)   wooden decks
E)   bricks B

Question 2

Describe the difference between the conduction band and the valence band.

Accepted Answer

The valence band is the group of highest energy occupied orbitals in the solid.The conduction band is the set of empty orbitals that are higher in energy than the valence band.In metals the difference in energy between the valence band and conduction band is fairly small,making it easy for electrons to move from the valence band to the conduction band.

Question 3

Identify an element that is NOT in silicate ceramics.

Accepted Answer

A)   oxygen
B)   silicon
C)   aluminum
D)   carbon
E)   hydrogen D

Question 4

Identify the thinnest known material.

Accepted Answer

A)   buckyball
B)   diamond
C)   graphene
D)   fullerene
E)   charcoal

Question 5

Cesium has a radius of 272 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

Accepted Answer

A)   314 pm
B)   385 pm
C)   544 pm
D)   628 pm

Question 6

Which of the following is considered a nonbonding atomic solid?

Accepted Answer

A)   Ne
B)   Cu
C)   I2
D)   Ca
E)   K

Question 7

Identify the compound that has fluorite structure.

Accepted Answer

A)   silver iodide
B)   barium chloride
C)   potassium bromide
D)   cesium chloride
E)   water

Question 8

Identify the characteristics of a face-centered cubic cell.

Accepted Answer

A)   edge length = 2  , 80% packing efficiency
B)   edge length = 2r, 52% packing efficiency
C)   edge length = 4r/  , 68% packing efficiency
D)   edge length = 2  , 74% packing efficiency
E)   edge length = 2r, 60% packing efficiency

Question 9

Identify for the triclinic unit cell.

Accepted Answer

A)   a ≠ b = c
B)   a = b ≠ c
C)   a ≠ b ≠ c
D)   a = b = c

Question 10

Identify the formula for silica.

Accepted Answer

A)   SiO4
B)   SiO3
C)   Si2O3
D)   SiO2
E)   Si3O6

Question 11

Which of the following represent the addition polymer formed from the compound below? CH2=CHCl

Accepted Answer

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Question 12

Identify a use for ceramics.

Accepted Answer

A)   beakers
B)   bridges
C)   furniture
D)   wooden decks
E)   bricks

Question 13

Which of the following is considered a molecular solid?

Accepted Answer

A)   Ag
B)   NH4NO3
C)   H2O
D)   Kr
E)   None of these is a molecular solid.

Question 14

Which type of bonding does Sr form upon solidification?

Accepted Answer

A)   covalent network
B)   ionic
C)   metallic
D)   molecular

Question 15

Identify the characteristics of a simple cubic cell.

Accepted Answer

A)   edge length = 2  , 80% packing efficiency
B)   edge length = 2r, 52% packing efficiency
C)   edge length = 4r/  , 68% packing efficiency
D)   edge length = 2  , 74% packing efficiency
E)   edge length = 2r, 60% packing efficiency

Question 16

Identify the largest unreinforced concrete dome in existence.

Accepted Answer

A)   Pantheon
B)   Hagia Sophia
C)   Orbetello aircraft hangar
D)   Ream's turtle
E)   Turin's exposition hall

Question 17

Identify the type of solid for AgCl.

Accepted Answer

A)   metallic atomic solid
B)   ionic solid
C)   nonbonding atomic solid
D)   molecular solid
E)   networking atomic solid

Question 18

A metal crystallizes in a face centered cubic structure and has a density of 11.9 g/cm3.If the radius of the metal atom is 138 pm,what is the identity of the metal?

Accepted Answer

A)   At
B)   Pd
C)   Mn
D)   Fe
E)   Cr

Question 19

Identify what Kevlar is NOT used for.

Accepted Answer

A)   helmets
B)   bullet-proof vests
C)   roads
D)   brake pads
E)   suspension bridge cables

Question 20

Which of the following substances should have the highest melting point?

Accepted Answer

A)   CO2
B)   CH4
C)   Ar
D)   I2
E)   MgO

Exam 12: Solids and Modern Materials