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Unformatted text preview: ramic or ionic solid might be a reasonable conductor of electricity? What needs to occur? | v v SECTION 2.3
Kinetics | e-Text Main Menu | Textbook Table of Contents pg057 [R] G13 7-27060 / IRWIN / Schaffer pgm 1-19-98 plm/iq 3-21-98 MP1 Chapter 2 Atomic Scale Structures 57 21. Explain the physical signiﬁcance of the requirement that exponents in Equation 2.4–7
obey the inequality p q. SECTION 2.5
The Bond-Energy Curve 31. Consider the ionic compound CaF2 . Given that r (Ca) 0.197 nm, r (Ca2 )
0.106 nm, r (F) 0.06 nm, and r (F ) 0.133 nm, estimate the coordination numbers
for each of the elements in this compound.
32. Determine the coordination number of the cation for NiO, ZnS, and CsI.
33. Draw the structure of CH4 , @ C @ , and @ N @ along the lines of Figure 2.6–5.
34. Discuss the reasons why most covalent solids are low-density materials, ionic solids are
intermediate density, and metals are high density.
35. Under what conditions would you use the r R concept to predict the coordination
numbers in a covalent solid?
36. What coordination number would you predict for germanium, which is a Group IV covalently bonded material?
37. Calculate the minimum and maximum r R ratios for CN 4.
38. A newly discovered crystalline compound has the chemical formula A2 B. You are given
the following information: r (A) 0.12 nm, r (A ) 0.13 nm, r (B) 0.15 nm, and
r (B ) 0.14 nm.
a. Explain why r (A ) r (A) but r (B ) r (B).
b. Assuming purely ionic bonding, calculate the coordination number (CN) of both the
cation and the anion. SECTION 2.6
Atomic Packing and
Coordination Numbers | v v 22. The bond-energy curve can be used to gain information about three of the four following materials properties. Which type of information cannot be determined from the
a. Bond energy
b. Equilibrium separation distance
c. Primary bond type
d. Vaporization temperature
23. Of the two materials shown in Figure 2.5–1, which do you anticipate will have a higher...
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