1. End Show © Copyright Pearson Prentice Hall Slide 1 of 19 The Nature of Solids In 1985, scientists discovered a new form of carbon. They called this form of carbon buckminsterfullerene, or buckyball for short. You will learn how the arrangement of particles in solids determines some general properties of solids. 13.3

2. End Show © Copyright Pearson Prentice Hall The Nature of Solids > Slide 2 of 19 A Model for Solids How are the structure and properties of solids related? The general properties of solids reflect the orderly arrangement of their particles and the fixed locations of their particles. 13.3

3. End Show © Copyright Pearson Prentice Hall The Nature of Solids Slide 3 of 19 > A Model for Solids The melting point (mp) is the temperature at which a solid changes into a liquid. 13.3

4. End Show Slide 4 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Crystal Structure and Unit Cells In a crystal, the particles are arranged in an orderly, repeating, three-dimensional pattern called a crystal lattice. 13.3

5. End Show Slide 5 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Crystal Structure and Unit Cells Three kinds of unit cells can make up a cubic crystal system. 13.3

6. End Show Slide 6 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Crystal Structure and Unit Cells Allotropes Allotropes are two or more different molecular forms of the same element in the same physical state. Allotropes have different properties because their structures are different. Only a few elements have allotropes. 13.3

7. End Show Slide 7 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Crystal Structure and Unit Cells Carbon Allotropes 13.3

8. End Show Slide 8 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Crystal Structure and Unit Cells Non-Crystalline Solids An amorphous solid lacks an ordered internal structure. Rubber, plastic, asphalt, and glass are amorphous solids. A glass is a transparent fusion product of inorganic substances that have cooled to a rigid state without crystallizing. 13.3

9. End Show Slide 9 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Sublimation When can sublimation occur? 17.4

10. End Show Slide 10 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids 17.4 Sublimation The change of a substance from a solid to a vapor without passing through the liquid state is called sublimation. Sublimation occurs in solids with vapor pressures that exceed atmospheric pressure at or near room temperature.

11. End Show Slide 11 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Sublimation When solid iodine is heated, the crystals sublime, going directly from the solid to the gaseous state. When the vapor cools, it goes directly from the gaseous to the solid state. 17.4

12. End Show Slide 12 of 19 © Copyright Pearson Prentice Hall > The Nature of Solids Concept Map 13 Solve the Concept Map with the help of an interactive guided tutorial.