1. Homework Answers 10.23 – a) cubic-closest, b) simple cubic, c) hex.-closest, d) body-centered cubic 10.25 – a) CaTiO 3, b) +4 10.73 – a) 175 pm, b) 11.3 g/cm 3 10.75 – 549 pm 10.77 – d = 428 pm, r = 185 pm 10.81 – one Cl - and one Cs + per cell 10.115 – a) 3 Nb’s and 3 O’s, b) NbO, c) +2 Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 1/1

2. Covalent Networks and Phase Diagrams Copyright © 2008 Pearson Prentice Hall, Inc.

3. Chapter 10/3 Structures of Some Covalent Network Solids Carbon graphite diamond fullerene nanotubes Silica (SiO 2 ) quartz sand quartz glass

4. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/4 Structures of Some Covalent Network Solids Carbon Allotropes Allotropes: Different structural forms of an element.

6. Structures of Some Covalent Network Solids Carbon Allotropes

7. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/7 Structures of Some Covalent Network Solids Carbon graphite diamond fullerene nanotubes Silica (SiO 2 ) quartz sand quartz glass (amorphous)

10. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/10 Phase Diagrams Normal: Occurs at 1 atm. Critical Point: A combination of temperature and pressure beyond which a gas cannot be liquified. Critical Temperature: The temperature beyond which a gas cannot be liquified regardless of the pressure. Critical Pressure: The pressure beyond which a liquid cannot be vaporized regardless of the temperature. Supercritical Fluid: A state of matter beyond the critical point that is neither liquid nor gas. Triple Point: A point at which three phases coexist in equilibrium.

12. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/12 Phase Diagrams Normal: Occurs at 1 atm. Critical Point: A combination of temperature and pressure beyond which a gas cannot be liquified. Critical Temperature: The temperature beyond which a gas cannot be liquified regardless of the pressure. Critical Pressure: The pressure beyond which a liquid cannot be vaporized regardless of the temperature. Supercritical Fluid: A state of matter beyond the critical point that is neither liquid nor gas. Triple Point: A point at which three phases coexist in equilibrium.

13. Phase Diagrams Carbon Dioxide

14. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/14 Phase Diagrams Normal: Occurs at 1 atm. Critical Point: A combination of temperature and pressure beyond which a gas cannot be liquified. Critical Temperature: The temperature beyond which a gas cannot be liquified regardless of the pressure. Critical Pressure: The pressure beyond which a liquid cannot be vaporized regardless of the temperature. Supercritical Fluid: A state of matter beyond the critical point that is neither liquid nor gas. Triple Point: A point at which three phases coexist in equilibrium.

15. Phase Diagrams Carbon Dioxide

16. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/16 Phase Diagrams Normal: Occurs at 1 atm. Critical Point: A combination of temperature and pressure beyond which a gas cannot be liquified. Critical Temperature: The temperature beyond which a gas cannot be liquified regardless of the pressure. Critical Pressure: The pressure beyond which a liquid cannot be vaporized regardless of the temperature. Supercritical Fluid: A state of matter beyond the critical point that is neither liquid nor gas. Triple Point: A point at which three phases coexist in equilibrium.

17. Copyright © 2008 Pearson Prentice Hall, Inc.Chapter 10/17 Phase Diagrams Normal: Occurs at 1 atm. Critical Point: A combination of temperature and pressure beyond which a gas cannot be liquified. Critical Temperature: The temperature beyond which a gas cannot be liquified regardless of the pressure. Critical Pressure: The pressure beyond which a liquid cannot be vaporized regardless of the temperature. Supercritical Fluid: A state of matter beyond the critical point that is neither liquid nor gas. Triple Point: A point at which three phases coexist in equilibrium.

19. Phase Diagrams Carbon Dioxide

20. Phase Diagrams Water

32. H47 – C10 10.17 - 10.21, 10.26, 10.29, 10.85, (10.87, 10.89)*, 10.91*, (10.93, 10.95)*, 10.109*, 10.117*