Question 1

24 karat gold contains __________% gold.

Accepted Answer

A) 24 
B) 25 
C) 5.0 x 101 
D) 75 
E) 1.00 x 102

Question 2

Which element is typically not added to steel to modify its properties?

Accepted Answer

A) carbon 
B) vanadium 
C) chromium 
D) nitrogen 
E) nickel

Question 3

Chromium crystallizes in a body-centered cubic unit cell. There are __________ chromium atoms per unit cell.

Accepted Answer

The answer of Chromium crystallizes in a body-centered cubic unit...

Question 4

The transition metals in group __________ have the highest melting points.

Accepted Answer

A) 4B 
B) 3B 
C) 6B 
D) 8B 
E) 2B

Question 5

The class of semiconductors, known as elemental, has special features. These are __________.

Accepted Answer

A) band gap and individual element valence electrons 
B) periodical table grouping and diamond crystal structure 
C) tetrahedral coordination geometry and sp2 hybrid orbitals 
D) overlapping hybrid orbitals and filed conduction bands 
E) none of the above

Question 6

The formation of a condensation polymer generally involves __________.

Accepted Answer

A) the addition of a plasticizer 
B) the mixing of sulfur with an addition polymer 
C) the elimination of a small molecule 
D) the vaporization of a plasticizer 
E) the formation of significant crosslinking

Question 7

What is the typical effect of the addition of an interstitial element on the properties of a metal?

Accepted Answer

A) increase in malleability and corrosion resistance 
B) increase in hardness and strength, decrease in ductility 
C) decrease in melting point and increase in ductility 
D) decrease in conductivity and increase in brittleness 
E) increased surface luster

Question 8

If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be a(n)__________.

Accepted Answer

A) alloy 
B) insulator 
C) conductor 
D) semiconductor 
E) nonmetal

Question 9

Potassium metal crystallizes in a body-centered cubic structure with a unit cell edge length of 5.31 Å. The radius of a potassium atom is __________ Å.

Accepted Answer

A) 1.33 
B) 1.88 
C) 2.30 
D) 2.66 
E) 5.31

Question 10

A category __________ plastic container will generally be the most easily recycled.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 22

Question 11

A material that contains more than one element and has the characteristic properties of metals is called a (an)__________.

Accepted Answer

The answer of A material that contains more than one...

Question 12

Which of the following is not a natural polymer?

Accepted Answer

A) silk 
B) starch 
C) protein 
D) cellulose 
E) nylon

Question 13

18 karat gold contains __________% gold.

Accepted Answer

A) 18 
B) 25 
C) 89 
D) 75 
E) 1.0 x 102

Question 14

As a polymer becomes more crystalline, __________.

Accepted Answer

A) its melting point decreases 
B) its density decreases 
C) its stiffness decreases 
D) its yield stress decreases 
E) None of the above is correct.

Question 15

Which one of the following cannot form a solid with a lattice based on the sodium chloride structure?

Accepted Answer

A) NaBr 
B) LiF 
C) RbI 
D) CuO 
E) CuCl2

Question 16

The empirical formula of an addition polymer __________.

Accepted Answer

A) is the same as that of the monomer from which it is formed except that 2 H and 1 O have been added 
B) is the same as that of the monomer from which it is formed except that 2 H and 1 O have been subtracted 
C) is the same as that of the monomer from which it is formed 
D) is the same as that of the monomer from which it is formed except that 2 H and 1 C have been added 
E) is the same as that of the monomer from which it is formed except that 2 H and 1 C have been subtracted

Question 17

The unit cell with all sides the same length and all angles equal to 90° that has lattice points only at the corners is called __________.

Accepted Answer

A) monoclinic 
B) body-centered cubic 
C) primitive cubic 
D) face-centered cubic 
E) spherical cubic

Question 18

A plasticizer makes a polymer more pliable by reducing the interactions between polymer chains.

Accepted Answer

A) True 
 B)False

Exam 12: Solids and Modern Materials