Which of the following ionic compounds should have

39) Which of the following ionic compounds should have the highest melting point?
A) NaI
B) MgO
C) NaCl
D) LiBr
E) CaS
Answer: B
Diff: 2 Type: MC Var: 1
Reference: Section 12-5

40) There are no types of crystalline solids that are held together by:
E
Diff: 2 Type: MC Var: 1
Reference: Section 12-5
41) Which of the substances below would produce the hardest crystals?
A
Diff: 2 Type: MC Var: 1
Reference: Section 12-5
42) Which combination of "type of solid" and specific example is INCORRECT?
D
Diff: 2 Type: MC Var: 1
Reference: Section 12-5
43) A crystal and its melt readily conduct electricity. The crystal also has a luster and is easily deformed.
Thus, it is:
A) a covalent network crystal
B) an ionic crystal
C) a metallic crystal
D) a molecular crystal
E) a covalent crystal
Answer: C
Diff: 2 Type: MC Var: 1
Reference: Section 12-5

44) Find a FALSE statement about X-rays.
C
Diff: 1 Type: MC Var: 1
Reference: Section 12-6
45) A compound of iron and sulfur crystallizes in a lattice pattern described as cubic closest packed
sulfide ions, with iron ions in all octahedral sites. What is its empirical formula?
A) FeS
B) FeS
2
C) Fe
3
S
4
D) Fe
2
S
E) Fe
2
S
3
A
Diff: 3 Type: MC Var: 1
Reference: Section 12-6
46) Three types of holes of the cubic closest packed structure are:
A
Diff: 2 Type: MC Var: 1
Reference: Section 12-6
47) Coordination number is:
A) the number of atoms per unit cell
B) the number of atoms in the corners of the unit cell
C) the number of atoms in contact with a given atom
D) the number of atoms in the holes of closest packed structures
E) the number of layers in close packed structures
Answer: C
Diff: 2 Type: MC Var: 1
Reference: Section 12-6