Textbook Question
Pure iron crystallizes in a body-centered cubic structure, shown in the figure. but small amounts of impurities can stabilize a facecentered cubic structure. Which form of iron has a higher density?
687
views
Ch.12 - Solids and Modern Materials
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 12, Problem 111b
Silicon carbide, SiC, has the three-dimensional structure shown in the figure.
(b) Would you expect the bonding in SiC to be predominantly ionic, metallic, or covalent?
Verified step by step guidance1
Step 1: Identify the elements present in silicon carbide (SiC). Silicon (Si) and carbon (C) are the elements involved.
Step 2: Determine the type of elements involved. Silicon is a metalloid and carbon is a non-metal.
Step 3: Analyze the electronegativity difference between silicon and carbon. Silicon has an electronegativity of 1.90 and carbon has an electronegativity of 2.55.
Step 4: Consider the bonding characteristics. A small electronegativity difference (less than 1.7) typically indicates covalent bonding.
Step 5: Examine the 3D structure of SiC. The structure shows a network of atoms bonded in a lattice, which is characteristic of covalent network solids.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
2mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Bonding Types
There are three primary types of chemical bonding: ionic, covalent, and metallic. Ionic bonds form between atoms with significantly different electronegativities, resulting in the transfer of electrons. Covalent bonds involve the sharing of electrons between atoms with similar electronegativities, while metallic bonds occur in metals where electrons are delocalized, allowing for conductivity and malleability.
Recommended video:
Guided course
02:15
Bonding Types
Electronegativity
Electronegativity is a measure of an atom's ability to attract and hold onto electrons. In the context of bonding, the difference in electronegativity between two atoms can help predict the type of bond that will form. A large difference typically indicates ionic bonding, while a small difference suggests covalent bonding. Silicon (Si) and carbon (C) have similar electronegativities, which influences the nature of their bonding in silicon carbide.
Recommended video:
Guided course
02:10Electronegativity Trends
Crystal Structure
The crystal structure of a material describes the orderly arrangement of atoms within it. In silicon carbide (SiC), the three-dimensional structure shown in the image indicates a covalent network, where each silicon atom is covalently bonded to carbon atoms in a tetrahedral arrangement. This structure contributes to the material's hardness and thermal stability, characteristics typical of covalent compounds.
Recommended video:
Guided course
01:42Resonance Structures
Related Practice
Textbook Question
Sodium oxide (Na2O) adopts a cubic structure with Na atoms represented by green spheres and O atoms by red spheres.
(c) The unit cell edge length is 5.550 Å. Determine the density of Na2O.
1764
views
1
rank
Textbook Question
Imagine the primitive cubic lattice. Now imagine pushing on top of it, straight down. Next, stretch another face by pulling it to the right. All angles remain 90°. What kind of primitive lattice have you made?
512
views
Textbook Question
Energy bands are considered continuous due to the large number of closely spaced energy levels. The range of energy levels in a crystal of copper is approximately 1×10−19 J. Assuming equal spacing between levels, one can approximate the spacing between energy levels by dividing the range of energies by the number of atoms in the crystal. b. Determine the average spacing in J between energy levels in the copper metal in part (a).