Domanda del libro di testo
CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (c) What about red light?
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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 101
Which statement correctly describes a difference between graphene and graphite? (a) Graphene is a molecule but graphite is not. (b) Graphene is a single sheet of carbon atoms and graphite contains many, and larger, sheets of carbon atoms. (c) Graphene is an insulator but graphite is a metal. (d) Graphite is pure carbon but graphene is not. (e) The carbons are sp2 hybridized in graphene but sp3 hybridized in graphite.
Guida verificata passo dopo passo1
Understand the structure of graphene: Graphene is a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice.
Understand the structure of graphite: Graphite consists of many layers of graphene stacked on top of each other, with weak van der Waals forces between the layers.
Compare the structures: Graphene is a single sheet, while graphite is composed of multiple sheets of graphene.
Consider the hybridization: Both graphene and graphite have carbon atoms that are sp2 hybridized, not sp3.
Evaluate the options: Option (b) correctly describes the difference between graphene and graphite, as graphene is a single sheet and graphite contains many sheets.
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Structure of Graphene and Graphite
Graphene is a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice, while graphite consists of multiple layers of graphene stacked together. This structural difference leads to distinct physical properties, such as electrical conductivity and mechanical strength, making graphene a highly sought-after material in various applications.
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01:42
Resonance Structures
Hybridization of Carbon Atoms
In graphene, each carbon atom is sp2 hybridized, meaning it forms three sigma bonds with neighboring carbon atoms and has one unhybridized p orbital that contributes to delocalized pi bonding. In contrast, graphite's carbon atoms are also primarily sp2 hybridized, allowing for similar bonding characteristics, but the presence of multiple layers affects the overall properties of the material.
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00:51Hybridization
Electrical Conductivity
Graphene is an excellent conductor of electricity due to its structure, which allows for the free movement of electrons across its surface. Graphite, while also a good conductor, exhibits different conductivity characteristics because of its layered structure, which can impede electron flow between layers. Understanding these differences is crucial for applications in electronics and materials science.
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01:40Extensive Property Example