Chapter 12 Clicker questions & Hwk Questions

In general metals are a) Malleable b) Ductile c) Good conductors of heat and electricity d) All of the above

All of the above

The integrated circuits in computers are made from materials that are ___________________.

semiconductors

The process of vulcanization involves adding which element to natural rubber?

Sulfur

Which element or elements are alloyed with gold to make green gold used in the jewelry industry?

Ag

Adding addition side chains to a monomer to reduce the degree of crystallinity in the polymer is called

cross-linking

The explanation for the differences in properties between ionic and metallic solids is that ___________

electrons can move freely in metals, but not in ionic compounds

Which of the following is not an addition polymer?

Polyurethane

True/false Substitutional alloys are solid solutions, but interstitial alloys are heterogenous alloys.

Substitutional alloys are solid solutions, but interstitial alloys are heterogenous alloys.

Which of the following statements is (are) true? Check all that apply. a) Nonmetallic elements are never found in alloys. b) Interstitial alloys tend to form between elements with similar ionic radii. c) Substitutional alloys tend to be more ductile than interstitial alloys.

Substitutional alloys tend to be more ductile than interstitial alloys.

Which substance below has the weakest intermolecular attractive forces? a) Sucrose (table sugar) b) Sodium chloride (table salt) c) Diamond d) Iron

Sucrose (table sugar)

Which of the following is not a type of solid? a)Ionic b)Molecular c)Metallic d) Supercritical

Supercritical

Which solid is incorrectly paired with a bonding description? A) ionic solids ; electrostatic attractions B) Metallic solids; delocalized electrons C) Molecular solids dispersion, dipole, and hydrogen bonds D) Network solid; transferred electrons

Network solid; transferred electrons

Which element or elements are alloyed with gold to make white gold used in the jewelry industry?

Pd

Which of the following elements, if doped into silicon would yield an n-type semiconductor: Ba, Ga, As, or C

As

Which of the following elements, if doped into silicon would yield an p-type semiconductor: B, H Cl, or C

Boron: Silicon is an element with four electrons in its outer shell.

Nanotubes can be made from which element below? a) H b) C c) N d) O

C

Which of the following statements are true? Check all that apply. a)Copper is the majority component in both brass and bronze. b) In stainless steel, the chromium atoms occupy interstitial positions. c) Intermetallic compounds have a fixed composition

Copper is the majority component in both brass and bronze. Intermetallic compounds have a fixed composition

Which of the following is not a type of cubic unit cell? a) Primitive b) Corner-centered c) Body-centered d) Face-centered

Corner-centered

Which element or elements are alloyed with gold to make rose gold used in the jewelry industry?

Cu

Which element or elements are alloyed with gold to make blue gold used in the jewelry industry?

In

Define a p-type semiconductor

In a p-type semiconductor, the III group element of the periodic table is added as a doping element. Examples. Boron doped Silicon, Aluminum doped Silicon, Boron doped Germanium etc. are the examples of p-type semiconductors. Holes are majority carriers.

Define a n-type semiconductor

In n type semiconductor V group element is added as doping element. Electrons are majority carriers. Examples are Phosphorus (P), Arsenic (As), Antimony (Sb)

Is SiSi a molecular, metallic, ionic, or covalent-network solid?

Si is a covalent-network solid

Silicon readily reacts to form silicon dioxide, SiO2SiO2, which is quite hard and is insoluble in water. Is SiO2SiO2 most likely a molecular, metallic, ionic, or covalent-network solid?

SiO2 is a covalent-network solid.

Covalent bonding occurs in both molecular and covalent-network solids. Which of the following statements best explains why these two kinds of solids differ so greatly in their hardness and melting points? a)The molecules in molecular solids are held together by weak intermolecular interactions. b) The atoms in covalent-network solids are more polarizable than those in molecular solids. c) The molecules in molecular solids have stronger covalent bonding than covalent-network solids do. d)Molecular solids are denser than covalent-network solids.

The molecules in molecular solids are held together by weak intermolecular interactions.

True/false Substitutional alloys have "solute" atoms that replace "solvent" atoms in a lattice, but interstitial alloys have "solute" atoms that are in between the "solvent" atoms in a lattice.

True

True/false The atomic radii of the atoms in a substitutional alloy are similar to each other, but in an interstitial alloy, the interstitial atoms are a lot smaller than the host lattice atoms.

True

The structures of compounds in their crystalline states can be determined using ________ diffraction

X-ray

Indicate what type of alloy is formed for blue gold. a) substitutional alloy b) interstitial alloys c) heterogeneous alloys d) intermetallic compounds

intermetallic compounds

In an interstitial alloy, the solute radii are ______ than the solvent radii

less

The type of element whose properties are explained by "band theory" is ________________.

metalloids

An important difference between crystalline solids and amorphous solids is that crystalline solids have _________________.

repeating lattice patterns

Indicate what type of alloy is formed for green gold. a) substitutional alloy b) interstitial alloys c) heterogeneous alloys d) intermetallic compound

substitutional alloy

Indicate what type of alloy is formed for rose gold. a) substitutional alloy b) interstitial alloys c) heterogeneous alloys d) intermetallic compounds

substitutional alloy

Indicate what type of alloy is formed for white gold. a) substitutional alloys b)interstitial alloys c) heterogeneous alloys d) intermetallic compounds

substitutional alloys

ddition polymers require a starting material with double bonds condensation polymers require ___________.

two functional groups

A material is superconducting if it conducts electricity

with no resistance

Which of the following is not an alloy? a) zinc b) brass c) bronze d) steel

zinc