Domanda del libro di testo
Indicate whether each statement is true or false: (c) Nonmetallic elements are never found in alloys.
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Ch.12 - Solids and Modern Materials
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 12, Problema 43
For each of the following alloy compositions, indicate whether you would expect it to be a substitutional alloy, an interstitial alloy, or an intermetallic compound: (a) Fe0.97Si0.03 (b) Fe0.60Ni0.40 (c) SmCo5.
Guida verificata passo dopo passo1
Identify the elements involved in the alloy composition: Iron (Fe) and Nickel (Ni).
Understand the nature of the elements: Both Fe and Ni are similar in size and are neighboring elements in the periodic table, which suggests they can replace each other in the lattice structure.
Determine the type of alloy based on the atomic sizes and properties: Since both elements are similar in size and can replace each other in the lattice, this suggests a substitutional alloy.
Consider the composition ratio: The ratio of Fe to Ni is 0.60 to 0.40, which supports the idea of a substitutional alloy where one type of atom substitutes for another in the crystal structure without distorting it.
Conclude the type of alloy: Given the similar atomic radii and the ability to form solid solutions, Fe0.60Ni0.40 is likely a substitutional alloy.
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Substitutional Alloys
Substitutional alloys are formed when atoms of one metal replace or substitute for atoms of another metal in the crystal lattice. This typically occurs when the two metals have similar atomic sizes and crystal structures, allowing for a uniform distribution of the alloying elements. An example is brass, which is an alloy of copper and zinc.
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Interstitial Alloys
Interstitial alloys are created when smaller atoms fit into the spaces (interstices) between the larger metal atoms in a crystal lattice. This type of alloy often involves a significant difference in atomic size, such as carbon atoms in iron to form steel. The presence of these smaller atoms can enhance the strength and hardness of the alloy.
Intermetallic Compounds
Intermetallic compounds are distinct phases formed between two or more metals that have a specific stoichiometric ratio and a defined crystal structure. Unlike substitutional or interstitial alloys, intermetallics exhibit unique properties and often have different physical and chemical characteristics than their constituent metals. An example is the compound Ni3Al, which has specific applications in high-temperature environments.
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Domanda del libro di testo
Which of these statements about alloys and intermetallic compounds is false? (a) Bronze is an example of an alloy. (b) 'Alloy' is just another word for 'a chemical compound of fixed composition that is made of two or more metals.' (c) Intermetallics are compounds of two or more metals that have a definite composition and are not considered alloys. (d) If you mix two metals together and, at the atomic level, they separate into two or more different compositional phases, you have created a heterogeneous alloy. (e) Alloys can be formed even if the atoms that comprise them are rather different in size.
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Domanda del libro di testo
An element crystallizes in a face-centered cubic lattice. The edge of the unit cell is 4.078 Å, and the density of the crystal is 19.30 g>cm3. Calculate the atomic weight of the element and identify the element.
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Domanda del libro di testo
Determine if each statement is true or false: (b) Substitutional alloys have 'solute' atoms that replace 'solvent' atoms in a lattice, but interstitial alloys have 'solute' atoms that are in between the 'solvent' atoms in a lattice.
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