Question

1. How do crystals and amorphous solids differ? a. Crystals have particles that are separated by b. Crystals have broad melting point ranges and shattered and amorphous solids do not. 6. Which of the following statements is true? a. Metallic solids have a dull appearance. c. Covalent solids have low melting points. amorphous solids do not. b. Molecular solids have a low density d. Ionic solids are soft. amorphous solids do not c. Crystals produce regular shaped fragments when 7. If you wanted to synthesize a compound that had a fairly low melting point and a low density, you d. Crystals have poorly formed patterns and would want to synthesize a metallic solid. an ionic solid. amorphous solids do not Which unit cell has eight particles located in the cormers, has sides that are all the same length, and b. a covalent solid. has angles of only 90°? 2. a. c. d. a molecular solid a. face-centered cubic unit cell b. body-centered cubic unit cell 8. The radius of silicon and lithium are quite different. c. simple cubic unit cel d. triclinic unit cell What type of impurity will lithium be? common substitutional impurity a. b. Erenkel defect C. interstitial impurity d. Schottky defect 3. Copper has a face-centered cubic unit cell. How many copper atoms are in each unit cell? a) 2 b) c) 8 9. Which of the following statements is true? a. Molecular solids have a low density b. lonic solids are soft 4. A particular metal has a simple cubic unit cell. How e Covalent solids have low melting points. Metallic solids have a dull appearance. many atoms of the metal are in each unit cell? a) 1 b)2 5. What is the coordination number for a hexagonal d. e) 6 d) 4 10. Which of the following statements is true? Metallic solids are casily deformed b. close packed unit cel? lonic solids have a low density Covalent solids are good conductors of heat and c. a) 8 b) 6 c) 4 d) 12 Molecular solids have substantial luster d. 名 8 2 3 4

Answer 1