Deck 8: Molecules and Materials

Question 1

Condensation polymers are made using a monomer with two functional groups which split off as the remainder of the two monomers are joined together. Often the small molecule eliminated in the process is water.

Answer 1

True

Question 2

Non-metals have small band gaps and do not conduct electricity.

Answer 2

False

Question 3

A substance that solidifies into a random arrangement is referred to as an amorphous solid.

Answer 3

True

Question 4

Boiling point is achieved when the liquid tranistioning to vapor is in equilibrium with the vapor condensing into liquid.

Question 5

If silver atoms follow a face-centered cubic unit cell pattern, what is the length of this unit cell if the atomic radius is 144.4 pm?

A) 144 pm
B) 179 pm
C) 408 pm
D) 635 pm

Question 6

Which term best describes the unoccupied band above the valence band?

A) Pauling's band
B) conduction band
C) induction band
D) passive motion band

Question 7

How many "equivalent" atoms belong to a single body-centered cube unit cell?

A) 1
B) 2
C) 3
D) 4

Question 8

Additives such as plasticizers are often employed to increase the usefulness of polymers.

Question 9

Metal bonding models including the sea of electron model. In this model the valence electrons of the metal atoms are separated by water molecules, and hydrogen bonding with these water mediators provides many of the metallic properties we observe.

Question 10

Which of the following substances represents an excellent conductor of electricity?

A) zinc
B) silicon
C) sucrose
D) iodine

Question 11

As intermolecular forces of attraction increase for a substance, the molecules tend to separate.

Question 12

If iridium has a density of 23.3 g/cm³ and forms a face-centered cubic lattice, what is the atomic radius of the iridium atom?

A) 135.7 pm
B) 203.7 pm
C) 271.4 pm
D) 648.0 pm

Question 13

If the orbitals of two atoms overlap and interact with constructive interference, the resulting increase in wave density results in a(n):

A) bonding molecular orbital
B) antibonding molecular orbital
C) free radical formation
D) cation formation

Question 14

Polymerization involves the linkage of several monomer units.

Question 15

How many "equivalent" atoms belong to a single face-centered cube unit cell?

A) 1
B) 2
C) 3
D) 4

Question 16

Semiconductor manufacture involves doping silicon or germanium with controlled trace amounts of another element.

Question 17

The ability to pull a metallic solid into a wire is described by the metal's:

A) mobility
B) ductility
C) malleability
D) polymeric breakpoint

Question 18

Sodium chloride is an excellent example of a(n):

A) amorphous solid
B) crystalline solid
C) covalent network
D) metallic solid

Question 19

The ability to bend a metallic solid is described by the metal's:

A) mobility
B) ductility
C) malleability
D) polymeric breakpoint

Question 20

A phase diagram provides detailed kinetics data on how fast a chemical reaction proceeds.

Question 21

The material etched during the creation of a MEMS device is referred to as the:

A) substrate
B) counter layer
C) mask
D) retardant

Question 22

You are likely to observe H-bonding in which of the following molecules?

A) NaF
B) C₂H₄F₂
C) Na₂O
D) HF

Question 23

Which of these materials provides an example of a molecular crystalline solid?

A) Al
B) V₂O₅
C) SiC
D) NaBr

Question 24

The tendency for molecules with permanent dipoles to align based on those dipoles is known as:

A) London forces
B) dipole-dipole forces
C) Van der Waal forces
D) ionic crystallization

Question 25

Resonance structures created from monomer units may lead to polymers that:

A) are striated by thermal loading
B) are self-thermosetting
C) are used as insulators
D) are electrical conductors

Question 26

The synthesis of a copolymer with one continuous "core" strand of the first monomer with attached strands of the second monomer creates a(n):

A) alternating copolymer
B) block copolymer
C) graft copolymer
D) anti-polymer

Question 27

An p-type material results if pure germanium is "doped" with:

A) gallium
B) carbon
C) arsenic
D) silicon

Question 28

Which pair of atoms is most likely to be involved in H-bonding?

A) H and F
B) Al and H
C) H and Cl
D) Na and H

Question 29

Polymers that are heated to produce bonds between carbon atoms on separate strands are said to be?

A) Fullerized polymers
B) cross-linked
C) thermoplastics
D) wired polymers

Question 30

A useful element for a MEMS device's primary component :

A) hydrogen
B) silicon
C) carbon
D) sodium

Question 31

"Doping" pure silicon with gallium results in a(n) ____ material.

A) p-type
B) n-type
C) s-type
D) d-type

Question 32

When a liquid reaches a temperature at which its vapor pressure is equal to one atmosphere, the liquid has reached its:

A) melting point
B) normal boiling point
C) sublimation point
D) evaporation point

Question 33

Which substance has the lowest vapor pressure:

A) ether (CH₃OCH₃)
B) propane (C₃H₈)
C) ethane (C₂H₆)
D) HCN

Question 34

Which of the following substances has the highest boiling point?

A) C₈H₁₈
B) Kr
C) CH₂Cl₂
D) H₂O

Question 35

An addition polymerization must begin with the formation of a(n):

A) free radical
B) electron pair
C) plasticizer
D) anion resin

Question 36

Which of these materials provides an example of an ionic crystalline solid?

A) SrCl₂
B) C
C) SiC
D) C₆₀

Question 37

Band gaps tend to be smallest for:

A) conductors
B) semiconductors
C) insulators
D) modulators