You are given the following information r a 012 nm r a

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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 Thermodynamics and 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. O H < = 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 bond-energy curve? 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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This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Institute of Technology.

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