Interpretation:
Among amorphous, ionic, molecular, covalent, network or metallic solids, the type of silicon carbide solid should be determined.
Concept introduction:
The main classes of crystalline solids can be characterized as follows:
(1) Ionic solids: These types of solids can be formed by particles known as ions that kept together through strong ionic forces. An example of ionic solid is
(2) Molecular solids: These solids are formed by particles called molecules. These molecules are kept together through weak hydrogen bonding and also Van der Waals forces. The example of this type of solid is sucrose.
(3) Covalent network solids: In these solids, atoms are kept together through covalent bonding and quartz.is an example of covalent network solid.
(4) Metallic solids: These types of solid are arrangement of large number of atoms and they also show metallic properties such as electrical conductivity. The example of this solid is iron and silver.
Want to see the full answer?
Check out a sample textbook solutionChapter 12 Solutions
CHEMISTRY-TEXT
- Silicon carbide, SiC, is a very hard, high-melting solid. What kind of crystal forces account for these properties?arrow_forwardOn the basis of the description given, classify each of these solids as molecular, metallic, ionic, network, or amorphous, and explain your reasoning. (a) A soft, slippery solid that has no definite melting point but decomposes at temperatures above 250 C; the solid does not conduct electricity (b) Violet crystals that melt at 114 C and whose vapor irritates the nose; neither the solid nor the liquid conducts electricity (c) Hard, colorless crystals that melt at 2800 C; the liquid conducts electricity, but the solid does not (d) A hard solid that melts at 3410 C; both the solid and the liquid conduct electricityarrow_forwardThe unit cell of silicon carbide, SiC, is illustrated below. (a) In what type of unit cell are the (dark gray) C atoms arranged? (b) If one edge of the silicon carbide unit cell is 436.0 pm, what is the calculated density of this compound? A portion of the solid-state structure of silicon carbide.arrow_forward
- MnO has either the NaCI type structure or the CsCI type structure (see Exercise 69). The edge length of the MnO unit cell is 4.47 10-8 cm and the density of MnO is 5.28 g/cm3. a. Does MnO crystallize in the NaCl or the CsCl type structure? b. Assuming that the ionic radius of oxygen is 140. pm, estimate the ionic radius of manganese.arrow_forwardOn the basis of the description given, classify each of the following solids as molecular, metallic, ionic, or covalent network. Explain your answers. a a lustrous, yellow solid that conducts electricity b a hard, black solid melting at 2350C to give a nonconducting liquid c a nonconducting, pink solid melting at 650C to give an electrically conducting liquid d red crystals having a characteristic odor and melting at 171Carrow_forwardThe CsCl structure is a simple cubic array of chloride ions with a cesium ion at the center of each cubic array (see Exercise 69). Given that the density of cesium chloride is 3.97 g/cm3, and assuming that the chloride and cesium ions touch along the body diagonal of the cubic unit cell, calculate the distance between the centers of adjacent Cs+ and Cl ions in the solid. Compare this value with the expected distance based on the sizes of the ions. The ionic radius of Cs+ is 169 pm, and the ionic radius of Cl is 181 pm.arrow_forward
- The solid-state structure of silicon carbide is shown below. (a) How many atoms of each type are contained within the unit cell? What is the formulas of silicon carbide? (b) Knowing that the SiC bond length is 188.8 pm (and the SiCSi bond angle is 109.5), calculate the density of SiC. Unit cell of SiC Sample of silicon carbidearrow_forwardIdentify the type of crystalline solid (metallic, network covalent, ionic, or molecular) formed by each of the following substances: (a) CaCl2 (b) SiC (c) N2 (d) Fe (e) C (graphite) (f) CH3CH2CH2CH3 (g) HCl (h) NH4NO3 (j) K3PO4arrow_forwardSpinel is a mineral that contains 37.9% aluminum, 17.1% magnesium, and 45.0% oxygen, by mass, and has a density of 3.57 g/cm3.The edge of the cubic unit cell measures 809 pm. How many of each type of ion are present in the unit cell?arrow_forward
- Crystalline polonium has a primitive cubic unit cell, lithium has a body-centered cubic unit cell, and calcium has a face-centered cubic unit cell. How many Po atoms belong to one unit cell? How many Li atoms belong to one unit cell? How many Ca atoms belong to one unit cell? Draw each unit cell. Indicate on your drawing what fraction of each atom lies within the unit cell.arrow_forwardIridium metal, Ir, crystallizes in a face-centered cubic (close-packed) structure. The edge length of the unit cell was found by x-ray diffraction to be 383.9 pm. The density of iridium is 22.42 g/cm3. Calculate the mass of an iridium atom. Use Avogadros number to calculate the atomic mass of iridium.arrow_forwardOutline a two-dimensional unit cell for the pattern shown here. If the black squares are labeled A and the white squares are B, what is the simplest formula for a compound based on this pattern?arrow_forward
- Chemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage LearningChemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub CoChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning
- World of Chemistry, 3rd editionChemistryISBN:9781133109655Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCostePublisher:Brooks / Cole / Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning