Domanda del libro di testo
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?
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Ch.12 - Solids and Modern Materials
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 12, Problema 105
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?
Guida verificata passo dopo passo1
Step 1: Identify the initial structure as a primitive cubic lattice, where all sides are equal, and all angles are 90°.
Step 2: Apply pressure from the top, which compresses the lattice along one axis, reducing the height of the unit cell.
Step 3: Stretch the lattice by pulling one face to the right, which increases the length of the unit cell along that axis.
Step 4: Observe that all angles remain 90°, but the unit cell now has different lengths along the three axes.
Step 5: Conclude that the resulting lattice is a tetragonal lattice, characterized by two equal axes and one different axis, with all angles remaining 90°.
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Primitive Cubic Lattice
A primitive cubic lattice is a type of crystal structure where atoms are located at the corners of a cube. Each unit cell contains one atom, as the corner atoms are shared among adjacent cells. This lattice is characterized by its simple geometry and is the basis for understanding more complex structures.
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00:49
Lattice Energy
Deformation of Lattices
Deformation of lattices refers to the changes in the arrangement of atoms in a crystal structure due to external forces, such as pressure or tension. In this scenario, pushing down on the lattice compresses it, while pulling on a face stretches it, resulting in a new arrangement of atoms while maintaining right angles between the axes.
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00:49Lattice Energy
Types of Crystal Systems
Crystal systems categorize crystals based on their symmetry and lattice parameters. The transformation described in the question leads to a body-centered cubic (BCC) structure, where an additional atom is added to the center of the cube, resulting in a more complex arrangement while preserving the cubic symmetry.
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01:11Types of Aqueous Solutions
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Introduction of carbon into a metallic lattice generally results
in a harder, less ductile substance with lower electrical
and thermal conductivities. Explain why this might be so.
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Domanda del libro di testo
For each of the intermetallic compounds shown in Figure 12.17 determine the number of each type of atom in the unit cell. Do your answers correspond to the ratios expected from the empirical formulas: Ni3Al?
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Domanda del libro di testo
Selected chlorides have the following melting points: NaCl (801 °C), MgCl2 (714 °C), PCl3 (-94 °C), SCl2 (-121 °C) (a) For each compound, indicate what type its solid form is (molecular, metallic, ionic, or covalent-network).
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